### Tamilnadu Board Chemistry Question papers for 11th Standard (English Medium) Question paper & Study Materials

#### 11th Standard Chemistry English Medium Free Online Test Book Back 1 Mark Questions with Answer Key - Part Three - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

When 22.4 litres of H2(g) is mixed with 11.2 litres of Cl2(g), each at 273 K at 1 atm the moles of HCl (g), formed is equal to

• 2)

For d-electron, the orbital angular momentum is

• 3)

Identify the wrong statement.

• 4)

Zeolite used to soften hardness of water is hydrated

• 5)

In a closed room of 1000 m3 a perfume bottle is opened up. The room develops smell. This is due to which property of gases

#### 11th Standard Chemistry English Medium Free Online Test Book Back One Mark Questions - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

40 ml of methane is completely burnt using 80 ml of oxygen at room temperature The volume of gas left. after cooling to room temperature is

• 2)

The energy of light of wavelength 45 nm is

• 3)

What would be the IUPAC name for an element with atomic number 222?

• 4)

Which of the following statements about hydrogen is incorrect?

• 5)

For alkali metals, which one of the following trends is incorrect?

#### 11th Standard Chemistry English Medium Free Online Test Book Back 1 Mark Questions with Answer Key - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

An element X has the following isotopic Composition 200X = 90%, 199X = 8% and 202X = 2% The Weighted average atomic mass of the element X is closet to

• 2)

The energies E1and E2 of two radiations are 25 eV and 50 eV respectively. The relation between their wavelengths ie $\lambda$1 and$\lambda$2 will be

• 3)

The electronic configuration of the elements A and Bare 1s2, 2s 2,2p6,3s2 and 1s2, 2s2,2p5 respectively. The formula of the ionic compound that can be formed between these elements is

• 4)

Water gas is

• 5)

Which of the following statements is in correct?

#### 11th Standard Chemistry English Medium Free Online Test Book Back One Mark Questions - Part Two - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

Rate of diffusion of a gas is

• 2)

All the naturally occurring processes proceed spontaneously in a direction which leads to

• 3)

At a given temperature and pressure, the equilibrium constant values for the equilibria
${ 3A }_{ 2 }+{ B }_{ 2 }+2C\overset { { K }_{ 1 } }{ \rightleftharpoons } { 2A }_{ 3 }BC$ and
${ A }_{ 3 }BC\overset { { K }_{ 2 } }{ \rightleftharpoons } 3/2\left[ { A }_{ 2 } \right] +\frac { 1 }{ 2 } { B }_{ 2 }+C$
The relation between K1 and K2 is

• 4)

Which of the following concentration terms is/are independent of temperature

• 5)

In the molecule O= C = OB, the formal charge on OA, C and OB are respectively.

#### 11th Standard Chemistry English Medium Free Online Test Book Back 1 Mark Questions with Answer Key - Part Two - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

Assertion: Two mole of glucose contains 12.044 x 1023 molecules of glucose
Reason: Total number of entities present in one mole of any substance is equal to 6.02 x 1022

• 2)

Splitting of spectral lines in an electric field is called

• 3)

The group of elements in which the differentiating electron enters the anti penultimate shell of atoms are called

• 4)

Which one of the following statements is incorrect with regard to ortho and para dihydrogen ?

• 5)

Which of the following compounds will not evolve H2 gas on reaction with alkali metals?

#### 11th Standard Chemistry English Medium Free Online Test Book Back One Mark Questions - Part Three - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

The number of water molecules in a drop of water weighing 0.018 g is

• 2)

Which of the following pairs of d-orbitals will have electron density along the axes ?

• 3)

Which of the following elements will have the highest electro negativity

• 4)

Non-stoichiometric hydrides are formed by

• 5)

sodium is stored in

#### 11th Standard Chemistry English Medium Free Online Test Creative 1 Mark Questions - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

The oxidation state of a element in its uncombined state is

• 2)

The electronic configuration of Eu (Atomic no. 63) Gd (Atomic no. 64) and Tb (Atomic no. 65) are

• 3)

Match the list I with List II and select the correct answer using. the code given below the lists.

 List I List II A A halogen 1 Cesium B An alkali metal 2 Germanium C A chalcogen 3 Iodine D A metalloid 4 Selenium
• 4)

The most abundant element in the universe is _________.

• 5)

Potassium chloride is used as

#### 11th Standard Chemistry English Medium Free Online Test Creative One Mark Questions with Answer Key - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

The Kc for given reaction will be
$A_{ 2\left( g \right) }+2{ B }_{ \left( g \right) }\rightleftharpoons { C }_{ \left( g \right) }+2D_{ \left( g \right) }$

• 2)

Which among the following molecule obeys octet rule?

• 3)

Which of the following sodium fusion extract of organic compound gives brilliant violet colour with sodium nitroprusside solution?

• 4)

Which of the following is heterolytic compound?

• 5)

#### 11th Standard Chemistry English Medium Free Online Test Creative 1 Mark Questions - Part Two - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

Which of the following statement(s) is/are not true about the following decomposition reaction.
2KClO3 $\longrightarrow$ 2KCl + 3O2
(i) Potassium is undergoing oxidation
(ii) Chlorine is undergoing oxidation
(iii) Oxygen is reduced
(iv) None of the species are undergoing oxidation and reduction.

• 2)

Which of the following provides the experimental justification of magnetic quantum number?

• 3)

Group 16 constitutes_____family.

• 4)

Hydrogen combines with carbon monoxide in the presence of copper catalyst will synthesise-------

• 5)

Match the list I with List II and select the correct answer using. the code given below the lists.

List I List II
A Gypsum 1 Bleaching Powder
B Plaster of paris 2 Chlorophyll
C Slaked lime 3 Statues
D Magnesium 4 Satin spar

#### 11th Standard Chemistry English Medium Free Online Test Creative One Mark Questions with Answer Key - Part Two - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

Identify the correct statement(s) with respect to the following reaction :
Zn + 2HCl $\longrightarrow$ ZnCl2 + H2
(i) Zinc is acting as an oxidant
(ii) Chlorine is acting as a reductant
(iii) Hydrogen is not acting as an oxidant
(iv) Zn is acting as a reductant

• 2)

22 g of a gas occupies 11.2 litres of volume at STP. The gas is _______________

• 3)

The speed of light is 3 x 1017 nms -1. Which is the closest to the wavelength in nanometer of a quantum of light with frequency of 6 x 1015 s-1?

• 4)

Characteristic of transition elements is incomplete

• 5)

Which of the following elements were unknown at that time of Mendeleev?

#### 11th Standard Chemistry English Medium Free Online Test Creative 1 Mark Questions - Part Three - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

Identify the correct statement(s) with respect to the following reaction :
Zn + 2HCl $\longrightarrow$ ZnCl2 + H2
(i) Zinc is acting as an oxidant
(ii) Chlorine is acting as a reductant
(iii) Hydrogen is not acting as an oxidant
(iv) Zn is acting as a reductant

• 2)

The mass of one mole of CaCl2 is _____________.

• 3)

Mass number is equal to the _

• 4)

What are the values of n, I, m and s for 3px electron?

• 5)

The longest form of periodic table was constructed by______

#### 11th Standard Chemistry English Medium Free Online Test Creative One Mark Questions with Answer Key - Part Three - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

The oxidation number of Cr in Cr2O72- __________ is

• 2)

The value of Avogadro Number N is equal to

• 3)

The radius of which of the following is same as that of the first Bohr orbit of hydrogen atom?

• 4)

The element with atomic number 31 belongs to _____

• 5)

Hydrogen accepts an electron to attain the inert gas configuration. In this way it resembles __________

#### 11th Standard Chemistry English Medium Free Online Test Creative 1 Mark Questions - Part Four - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

Consider the following statements
i) Matter possesses mass.
ii) 22-carat gold is a mixture.
iii) Dry ice is a compound.
Which of the following statement(s) given above is/ are correct?

• 2)

Which one of the following orbitals is spherical in shape?

• 3)

Law of triad was unable to explain for the element

• 4)

In the following the element with the highest ionisation energy is

• 5)

Hydrogen is used in _________

#### 11th Standard Chemistry English Medium Free Online Test Creative One Mark Questions with Answer Key - Part Four - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

Assertion (A): Among halogens fluorine is the best oxidant. Reason
(R): Fluorine is the most electronegative atom.

• 2)

In redox reaction which of the following Is true?

• 3)

Which of the following conclusions could not be derived from Rutherford's $\alpha$-particle scattering experiment?

• 4)

Considering Bohr's model which of the following statements is correct?

• 5)

The general electronic configuration of p-block element is _____

#### 11th Standard Chemistry English Medium Free Online Test Creative 1 Mark Questions - Part Five - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

The change in the oxidation number of S in H2S and SO2,in the following industrial reaction:
2H2S(g) + SO2(g) $\longrightarrow$ 3S(s) + H2O(g)

• 2)

Assertion: Equal volumes of all the gases do not contain equal number of atoms
Reason: Atom is the smallest particle which takes part in chemical reactions.

• 3)

Excluding hydrogen and helium, the smallest element in the periodic table is _____

• 4)

The products formed during the cracking long chain hydrocarbon C6H12 are-----------

• 5)

The main pigment in plants is chlorophyll which contains ________

#### 11th Standard Chemistry English Medium Free Online Test Creative One Mark Questions with Answer Key - Part Five - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

Identify the correct statement(s) with respect to the following reaction :
Zn + 2HCl $\longrightarrow$ ZnCl2 + H2
(i) Zinc is acting as an oxidant
(ii) Chlorine is acting as a reductant
(iii) Hydrogen is not acting as an oxidant
(iv) Zn is acting as a reductant

• 2)

The number of nodes in s orbital of any energy level is equal to

• 3)

Which one of the quantum number is used to calculate the angular momentum of an atom?

• 4)

Pick the incorrect statement about the factors affecting ionization energy

• 5)

What is the electronic configuration of the elements of group 14?

#### 11th Standard Chemistry English Medium Free Online Test Volume 1 One Mark Questions 2020 - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

Assertion: Two mole of glucose contains 12.044 x 1023 molecules of glucose
Reason: Total number of entities present in one mole of any substance is equal to 6.02 x 1022

• 2)

The change in the oxidation number of S in H2S and SO2,in the following industrial reaction:
2H2S(g) + SO2(g) $\longrightarrow$ 3S(s) + H2O(g)

• 3)

Which form of based on physical characteristics possess neither definite volume nor definite shape?

• 4)

If a beaker holds 576g of water, what will be the gram molecules of water in that beaker?

• 5)

Match the list-I with list-II and select the correct answer using the code given below the lists

 List-I List-II A Molecular formula 1 Completely consumed B Stoichiometric Equation 2 Left unreacted C Limiting reagent 3 n x Empirical formula D Excess reagent 4 Balanced equation

#### 11th Standard Chemistry English Medium Free Online Test Volume 1 One Mark Questions with Answer Key 2020 - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

Which of the following compound(s) has /have a percentage of carbon same as that in ethylene (C2H4)

• 2)

Atomicity of nitrogen is

• 3)

The empirical formula of Alkene is _______________

• 4)

Which of the following does not represent the mathematical expression for the Heisenberg uncertainty principle?

• 5)

${ \Psi }^{ 2 }$ = 0 represents:

#### 11th Standard Chemistry English Medium Free Online Test Volume 2 One Mark Questions 2020 - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

Which of the following is not a general characteristic of equilibrium involving physical process

• 2)

$A+B\rightleftharpoons C+D,{ k }_{ c }$for this reaction is 10. If c 1, 2, 3, 4 mole/litre of A, B, C and D respectively are present in a container at 25°C, the direction of reaction will be

• 3)

H2 + S ⇌ H2S + energy. In this reversible reaction, select the factor which will shift the equilibrium to the right.

• 4)

The KH for the solution of oxygen dissolved in water is 4 × 104 atm at a given temperature. If the partial pressure of oxygen in air is 0.4 atm, the mole fraction of oxygen in solution is

• 5)

Statement I: Acetic acid deviates from ideal behaviour.
Statement II: Acetic acid exists as a dimer by forming inter molecular hydrogen bonds and hence deviates from Raoult's law.

#### 11th Standard Chemistry English Medium Free Online Test Volume 2 One Mark Questions with Answer Key 2020 - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

Equimolar concentrations of H2 and I2 are heated to equilibrium in a 1 litre flask. What percentage of initial concentration of Hhas reacted at equilibrium if rate constant for both forward and reverse reactions are equal

• 2)

Statement I: In dissociation of PCI5 to PCl3 and Cl2,Kp> Kc
Statement II : In dissociation of PCI5, ∆ng = -ve and so K, > Kc

• 3)

Statement I. Addition of an inert gas at constant volume has no effect on equilibrium.
Statement II. When an inert gas is added, the total number of moles of gases present in the container increases and total pressure also increases, the partial pressure of the products and reactants are unchanged.

• 4)

In the reaction N2 + 3H2 ⇌ 2NH3 + x kCal, one mole of N2 reacts with 3 moles of H2 at equilibrium. Then the value of ∝ (degree of dissociation) is approximately ________. P is the pressure at equilibrium

• 5)

Which one of the following gases has the lowest value of Henry's law constant?

#### 11th Standard Chemistry Basic Concepts of Chemistry and Chemical Calculations English Medium Free Online Test One Mark Questions 2020 - 2021 - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

An element X has the following isotopic Composition 200X = 90%, 199X = 8% and 202X = 2% The Weighted average atomic mass of the element X is closet to

• 2)

When 22.4 litres of H2(g) is mixed with 11.2 litres of Cl2(g), each at 273 K at 1 atm the moles of HCl (g), formed is equal to

• 3)

Fe2 + $\longrightarrow$ Fe3+ + e- is a ________ reaction.

• 4)

Among the three metals, zinc, copper and silver, the electron releasing tendency decreases in the following order.

• 5)

Match the list-I with list-II and select the correct answer using the code given below the lists.

 List-I List-II A Cr2O72- 1 +5 B MnO4- 2 +6 C VO3- 3 +3 D FeF63+ 4 +7

#### 11th Standard Chemistry Basic Concepts of Chemistry and Chemical Calculations English Medium Free Online Test 1 Mark Questions with Answer Key 2020-20 - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

An element X has the following isotopic Composition 200X = 90%, 199X = 8% and 202X = 2% The Weighted average atomic mass of the element X is closet to

• 2)

Carbon forms two oxides, namely carbon monoxide and carbon dioxide. The equivalent mass of which element remains constant?

• 3)

The number of water molecules in a drop of water weighing 0.018 g is

• 4)

Fe2 + $\longrightarrow$ Fe3+ + e- is a ________ reaction.

• 5)

Which one of the following represents 180g of water?

#### 11th Standard Chemistry Quantum Mechanical Model of Atom English Medium Free Online Test One Mark Questions 2020 - 2021 - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

Two electrons occupying the same orbital are distinguished by

• 2)

The number of nodes in s orbital of any energy level is equal to

• 3)

Which one of the following orbitals is spherical in shape?

• 4)

A macroscopic particle of mass 100 g and moving at a velocity of 100 cm S-1 will have a de Broglie wavelength of

• 5)

Match the list I with List II and select the correct answer using. the code given below the lists.

 List I List II A The energies of electrons are quantized 1 Thomson's atomic model B Atom is a positively charged sphere in which the electrons are embedded 2 Bohr atom model C Planetary model 3 De Broglie D Dual nature of the microscopic particles 4 Rutherford

#### 11th Standard Chemistry Quantum Mechanical Model of Atom English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021 - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

According to the Bohr Theory, which of the following transitions in the hydrogen atom will give rise to the least energetic photon?

• 2)

Based on equation E = $-2.178\times { 10 }^{ -18 }J\left( \frac { { Z }^{ 2 } }{ { n }^{ 2 } } \right)$certain conclusions are written. Which of them is not correct?

• 3)

The maximum number of electrons in a sub shell is given by the expression

• 4)

Consider the following statements and pick the incorrect statement(s).
1.Schrodinger wave equation is used to determine the probability of finding a electron at a given point in space.
2.The energy of a electron at infinity is positive
3.Angular momentum quantum number gives information regarding subshells.

• 5)

As per Aufbau principle, arrange the orbitals in increasing order of energy

#### 11th Standard Chemistry Periodic Classification of Elements English Medium Free Online Test One Mark Questions 2020 - 2021 - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

What would be the IUPAC name for an element with atomic number 222?

• 2)

The group of elements in which the differentiating electron enters the anti penultimate shell of atoms are called

• 3)

The first list of 23 chemical elements was published by _____ in the year 1789.

• 4)

The statement that is not correct for modern classification of element is
(1) The properties of elements are periodic function of these atomic numbers.
(2) The ionisation enthalpy of the elements generally increase with increase in atomic number
(3) For transition elements the 3d orbitals are filled after 3p-orbitals and befire 4s orbitals.
(4) Fifth period contain 18 elements.

• 5)

Law of octaves was proposed by _____

#### 11th Standard Chemistry Periodic Classification of Elements English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021 - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

The electronic configuration of the elements A and Bare 1s2, 2s 2,2p6,3s2 and 1s2, 2s2,2p5 respectively. The formula of the ionic compound that can be formed between these elements is

• 2)

Period of an element is represented by _____ quantum number

• 3)

Match the list I with List II and select the correct answer using. the code given below the lists.

 List I List II A Chancourtois 1 Addition of synthetic elements B Rang 2 Families and periods Long form C Glenn Seaborg 3 Modem periodic law D Moseley 4 First periodic law
• 4)

Which of the following is Dobereiner's triad?

• 5)

What would be the formula of the compound formed by A and B, where A has the valence 3 and B has the valence 3?

#### 11th Standard Chemistry Hydrogen English Medium Free Online Test One Mark Questions 2020 - 2021 - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

Which of the following statements about hydrogen is incorrect?

• 2)

If a body of a fish contains 1.2 g hydrogen in its total body mass, if all the hydrogen is replaced with deuterium then the increase in body weight of the fish will be

• 3)

The cause of permanent hardness of water is due to

• 4)

A commercial sample of hydrogen peroxide marked as 100 volume H2O2, it means that

• 5)

For decolorisation of 1 mole of acidified KMnO4, the moles of H2O2 required is

#### 11th Standard Chemistry Hydrogen English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021 - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

Water gas is

• 2)

Which one of the following is manufactured in Haber's process?

• 3)

Which of the following is used as desiccants to remove moisture from organic solvents?

• 4)

Which of the following is used for cutting and welding?

• 5)

At the temperature conditions of the earth (300K) the OPR of H2O is ------

#### 11th Standard Chemistry Alkali and Alkaline Earth Metals English Medium Free Online Test One Mark Questions 2020 - 2021 - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

For alkali metals, which one of the following trends is incorrect?

• 2)

sodium is stored in

• 3)

Find the wrong statement

• 4)

In case of alkali metal halides, the ionic character increases in the order

• 5)

The product obtained as a result of a reaction of nitrogen with CaC2 is

#### 11th Standard Chemistry Alkali and Alkaline Earth Metals English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021 - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

Which of the following compounds will not evolve H2 gas on reaction with alkali metals?

• 2)

In which process, fused sodium hydroxide is electro lysed for extraction of sodium

• 3)

Assertion Generally alkali and alkaline earth metals form superoxides
Reason There is a single bond between O and 0 in superoxides

• 4)

Which is the correct sequence of solubility of  carbonates of alkaline earth metals?

• 5)

The compound (X) on heating gives a colourless gas and a residue that is dissolved in water to obtain (B). Excess of CO2 is bubbled through aqueous solution of B, C is formed. Solid (C) on heating gives back X. (B) is

#### 11th Standard Chemistry Gaseous State English Medium Free Online Test One Mark Questions 2020 - 2021 - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

Gases deviate from ideal behavior at high pressure. Which of the following statement(s) is correct for non-ideality?

• 2)

A bottle of ammonia and a bottle of HCI connected through a long tube are opened simultaneously at both ends. The white ammonium chloride ring first formed will be

• 3)

The table indicates the value of van der Waals constant 'a' in (dm3)2 atm. mol-2.

 Gas O2 N2 NH3 CH4 a 1.360 1.390 4.170 2.253

The gas which can be most easily liquefied is

• 4)

Compressibility factor for CO2 at 400 K and 71.0 bar is 0.8697. The molar volume of CO2 under these conditions is

• 5)

Four gases P, Q, R and S have almost same values of 'b' but their 'a' values (a, b are Vander Waals Constants) are in the order Q < R < S < P. At a particular temperature, among the four gases the most easily liquefiable one is

#### 11th Standard Chemistry Gaseous State English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021 - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

When an ideal gas undergoes unrestrained expansion, no cooling occurs because the molecules

• 2)

The temperatures at which real gases obey the ideal gas laws over a wide range of pressure is called

• 3)

The value of universal gas constant depends upon

• 4)

Use of hot air balloon in sports at meteorological observation is an application of

• 5)

Consider the following statements
i) Atmospheric pressure is less at the top of a mountain than at sea level
ii) Gases are much more compressible than solids or liquids
iii) When the atmospheric pressure increases the height of the mercury column rises.
Select the correct statement

#### 11th Standard Chemistry Thermodynamics English Medium Free Online Test One Mark Questions 2020 - 2021 - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

The amount of heat exchanged with surrounding at constant temperature pressure is given by the quantity

• 2)

In an adiabatic process, which of the following is true?

• 3)

An ideal gas expands from the volume of 1 x 10-3 m3 to 1 x 10-2 m3 at 300 K against a constant pressure at 1 x 105 Nm-2. The work done is

• 4)

The enthalpies of formation of Al2O3 and Cr2Oare -1596 kJ and -1134 kJ, respectively. ΔH for the reaction 2AI + Cr2O3 ⟶ 2Cr + Al2O3 is

• 5)

If one mole of ammonia and one mole of hydrogen chloride are mixed in a closed container to form ammonium chloride gas, then

#### 11th Standard Chemistry Thermodynamics English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021 - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

All the naturally occurring processes proceed spontaneously in a direction which leads to

• 2)

Heat of combustion is always

• 3)

C(diamond) ) ⟶ C(graphite), ΔH = -ve, this indicates that

• 4)

Change in internal energy, when 4 kJ of work is done on the system and 1 kJ of heat is given out by the system is

• 5)

The value of ΔH for cooling 2 moles of an ideal monatomic gas from 125° C to 25° C at constant pressure will be [given Cp=$\frac{5}{2}$R]

#### 11th Standard Chemistry Physical and Chemical Equilibrium English Medium Free Online Test One Mark Questions 2020 - 2021 - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

If Kb and Kf for a reversible reactions are 0.8 ×10–5 and 1.6 × 10–4 respectively, the value of the equilibrium constant is,

• 2)

Solubility of carbon dioxide gas in cold water can be increased by

• 3)

K1 and K2 are the equilibrium constants for the reactions respectively.
${ N }_{ 2 }(g)+{ O }_{ 2 }(g)\overset { { K }_{ 1 } }{ \rightleftharpoons } 2NO(g)$
$2NO(g)+{ O }_{ 2 }(g)\overset { { K }_{ 2 } }{ \rightleftharpoons } { 2NO }_{ 2 }(g)$
What is the equilibrium constant for the reaction NO2(g) ⇌ ½N2(g) + O2(g)

• 4)

Equimolar concentrations of H2 and I2 are heated to equilibrium in a 1 litre flask. What percentage of initial concentration of Hhas reacted at equilibrium if rate constant for both forward and reverse reactions are equal

• 5)

A 20 litre container at 400 K contains CO2 (g) at pressure 0.4 atm and an excess of SrO (neglect the volume of solid SrO). The volume of the container is now decreased by moving the movable piston fitted in the container. The maximum volume of the container, when pressure of CO2 attains its maximum value will be:
Given that: SrCO3 (S) ⇌ SrO (S) + CO2(g)
KP = 1.6 atm

#### 11th Standard Chemistry Physical and Chemical Equilibrium English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021 - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

${K_c\over K_p}$ for the reaction,
N2(g) + 3H2(g) ⇌ 2NH3(g) is

• 2)

In which of the following equilibrium, KP and KC are not equal?

• 3)

The values of KP1 and KP2 for the reactions
X ⇌ Y + Z
A ⇌ 2B are in the ratio 9: 1 if degree of dissociation and initial concentration of X and A be equal then total pressure at equilibrium P1 and P2 are in the ratio

• 4)

In a chemical equilibrium, the rate constant for the forward reaction is 2.5 × 102 and the equilibrium constant is 50. The rate constant for the reverse reaction is,

• 5)

The equilibrium constants of the following reactions are:

 N2 + 3H2 ⇌ 2NH3   : K1 N2 + O2 ⇌ 2NO      : K2 H2 + ½O2 ⇌ H2O   : K3

The equilibrium constant (K) for the reaction ;
${ 2NH }_{ 3 }+5/2{ O }_{ 2 }\overset { K }{ \rightleftharpoons } 2NO+{ 3H }_{ 2 }{ O },$ will be

#### 11th Standard Chemistry Solutions English Medium Free Online Test One Mark Questions 2020 - 2021 - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

The molality of a solution containing 1.8g of glucose dissolved in 250g of water is

• 2)

Which one of the following gases has the lowest value of Henry's law constant?

• 3)

According to Raoults law, the relative lowering of vapour pressure for a solution is equal to

• 4)

The empirical formula of a nonelectrolyte(X) is CH2O. A solution containing six gram of X exerts the same osmotic pressure as that of 0.025 M glucose solution at the same temperature. The molecular formula of X is

• 5)

Normality of 1.25M sulphuric acid is

#### 11th Standard Chemistry Solutions English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021 - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

The partial pressure of nitrogen in air is 0.76 atm and its Henry's law constant is 7.6 × 104 atm at 300K. What is the mole fraction of nitrogen gas in the solution obtained when air is bubbled through water at 300K?

• 2)

Which one of the following is incorrect for ideal solution?

• 3)

P1 and P2 are the vapour pressures of pure liquid components, 1 and 2 respectively of an ideal binary solution if x1 represents the mole fraction of component 1, the total pressure of the solution formed by 1 and 2 will be

• 4)

200ml of an aqueous solution of a protein contains 1.26g of protein. At 300K, the osmotic pressure of this solution is found to be 2.52 × 10–3 bar. The molar mass of protein will be (R = 0.083 L bar mol–1 K–1)

• 5)

Assertion: An ideal solution obeys Raoults Law
Reason: In an ideal solution, solvent-solvent, as well as solute-solute interactions, are similar to solute-solvent interactions.

#### 11th Standard Chemistry Chemical bonding English Medium Free Online Test One Mark Questions 2020 - 2021 - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

In which of the following Compounds does the central atom obey the octet rule?

• 2)

Assertion: Oxygen molecule is paramagnetic.
Reason: It has two unpaired electron in its bonding molecular orbital.

• 3)

In ClF3, NF3 and BF3 molecules the chlorine, nitrogen and boron atoms are

• 4)

Which of these represents the correct order of their increasing bond order

• 5)

The correct order of O-O bond length in hydrogen peroxide, ozone and oxygen is

#### 11th Standard Chemistry Chemical bonding English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021 - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

Which one of the following is the likely bond angles of sulphur tetrafluoride molecule?

• 2)

According to Valence bond theory, a bond between two atoms is formed when

• 3)

Hybridisation of central atom in PClinvolves the mixing of orbitals

• 4)

Which one of the following is diamagnetic?

• 5)

Shape and hybridisation of IF5 are

#### 11th Standard Chemistry Fundamentals of Organic Chemistry English Medium Free Online Test One Mark Questions 2020 - 2021 - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

Select the molecule which has only one $\pi$ bond.

• 2)

The general formula for alkadiene is

• 3)

The IUPAC name of the compound CH– CH = CH – C ≡ CH is

• 4)

The IUPAC name of the compound ${ H }_{ 3 }C-\overset { \underset { | }{ { CH }_{ 3 } } }{ \underset { \overset { | }{ { CH }_{ 3 } } }{ C } } -CH=C{ \left( { CH }_{ 3 } \right) }_{ 2 }$ is

• 5)

The IUPAC name of the compound ${ CH }_{ 3 }-\underset { \overset { | }{ OH } }{ CH } -COOH$ is

#### 11th Standard Chemistry Fundamentals of Organic Chemistry English Medium Free Online Test 1 Mark Questions with Answer Key 2020 - 2021 - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

In the hydrocarbo $\overset { 7 }{ { CH }_{ 3 } } -\overset { 6 }{ { CH }_{ 2 } } -\overset { 5 }{ CH } =\overset { 4 }{ CH } -\overset { 3 }{ { CH }_{ 2 } } -\overset { 2 }{ CH } =\overset { 1 }{ CH }$ the state of hybridisation of carbon 1,2,3,4 and 7 are in the following sequence.

• 2)

Which one of the following names does not fit a real name?

• 3)

IUPAC name of ${ CH }_{ 3 }-\overset { \underset { | }{ H } }{ \underset { \overset { | }{ { C }_{ 2 }{ H }_{ 5 } } }{ C } } -\overset { \underset { | }{ { C }_{ 4 }{ H }_{ 9 } } }{ \underset { \overset { | }{ { CH }_{ 3 } } }{ C } } -{ CH }_{ 3 }$ is

• 4)

The IUPAC name of the compound  is

• 5)

The IUPAC name of  is

#### 11th Standard Chemistry Basic Concept of Organic Reactions English Medium Free Online Test One Mark Questions 2020 - 2021 - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

For the following reactions
(A) CH3CH2CH2Br + KOH → CH2 = CH2 + KBr + H2O
(B) (CH3)3CBr + KOH → (CH3)3 COH + KBr
(C)
Which of the following statement is correct?

• 2)

Homolytic fission of covalent bond leads to the formation of

• 3)

Which of the group has highest +I effect?

• 4)

-I effect is shown by

• 5)

Assertion: Tertiary Carbocations are generally formed more easily than primary Carbocations ions.
Reason: Hyper conjugation, as well as inductive effect due to additional alkyl group, stabilize tertiary carbonium ions.

#### 11th Standard Chemistry Basic Concept of Organic Reactions English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021 - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

What is the hybridisation state of benzyl carbonium ion?

• 2)

Which of the following species is not electrophilic in nature?

• 3)

Hyper Conjugation is also known as

• 4)

Which of the following species does not exert a resonance effect?

• 5)

Which of the following carbocation will be most stable?

#### 11th Standard Chemistry Hydrocarbons English Medium Free Online Test One Mark Questions 2020 - 2021 - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

The correct statement regarding the comparison of staggered and eclipsed conformations of ethane is

• 2)

In the following reaction,

The major product obtained is

• 3)

The compounds formed at anode in the electrolysis of an aquous solution of potassium acetate are

• 4)

The compound that will react most readily with gaseous bromine has the formula

• 5)

Which among the following alkenes on reductive ozonolysis produces only propanone?

#### 11th Standard Chemistry Hydrocarbons English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021 - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

The correct statement regarding the comparison of staggered and eclipsed conformations of ethane is

• 2)

In the following reaction,

The major product obtained is

• 3)

The compounds formed at anode in the electrolysis of an aquous solution of potassium acetate are

• 4)

The compound that will react most readily with gaseous bromine has the formula

• 5)

Which among the following alkenes on reductive ozonolysis produces only propanone?

#### 11th Standard Chemistry Haloalkanes and Haloarenes English Medium Free Online Test One Mark Questions 2020 - 2021 - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

The IUPAC name of  is

• 2)

Arrange the following compounds in increasing order of their density
A) CCl4
B) CHCl3
C) CH2Cl2
D) CH3Cl

• 3)

In the reaction  X is ________.

• 4)

The treatment of ethyl formate with excess of RMgX gives

• 5)

The name of C2F4Cl2 is ___________

#### 11th Standard Chemistry Haloalkanes and Haloarenes English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021 - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

Of the following compounds, which has the highest boiling point?

• 2)

C -X bond is strongest in

• 3)

Benzene reacts with Cl2 in the presence of FeCl3 and in absence of sunlight to form

• 4)

Assertion: In mono haloarenes, electrophilic substitution occurs at ortho and para positions.
Reason: Halogen atom is a ring deactivator.

• 5)

Freon-12 is manufactured from tetrachloro methane by

#### 11th Standard Chemistry Environmental Chemistry English Medium Free Online Test One Mark Questions 2020 - 2021 - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

The gaseous envelope around the earth is known as atmosphere. The region lying between an altitudes of 11-50 km is __________

• 2)

The pH of normal rain water is

• 3)

Identify the wrong statement in the following

• 4)

Release of oxides of nitrogen and hydrocarbons into the atmosphere by motor vehicles is prevented by using __________

• 5)

Match the List I with List II and select the correct answer using the code given below the lists

List I     List II
A. Depletion of ozone layer     1. CO2
B. Acid rain  2. NO
C. Photochemical smog  3. SO2
D. Green house effect  4. CFC

#### 11th Standard Chemistry Environmental Chemistry English Medium Free Online Test 1 Mark Questions with Answer Key 2020 - 2021 - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

Photo chemical smog formed in congested metropolitan cities mainly consists of

• 2)

Ozone depletion will cause

• 3)

Living in the atmosphere of CO is dangerous because it

• 4)

Biochemical oxygen Demand value less than 5 ppm indicates a water sample to be

• 5)

Assertion (A): Excessive use of chlorinated pesticide causes soil and water pollution.
Reason (R) : Such pesticides are non-biodegradable.

#### 11th Standard Chemistry English Medium Free Online Test 1 Mark Questions 2020 - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

Total number of electrons present in 1.7 g of ammonia is

• 2)

Identify the correct statement(s) with respect to the following reaction :
Zn + 2HCl $\longrightarrow$ ZnCl2 + H2
(i) Zinc is acting as an oxidant
(ii) Chlorine is acting as a reductant
(iii) Hydrogen is not acting as an oxidant
(iv) Zn is acting as a reductant

• 3)

Which one of the following is the standard for atomic mass?

• 4)

How many grams are contained in 1 gram atom of Na?

• 5)

When methane is burnt in oxygen to produce CO2 and H2O, the oxidation number of carbon changes by _______________.

#### 11th Standard Chemistry English Medium Free Online Test One Mark Questions with Answer Key 2020 - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

If the energy of an electron in the second Bohr orbit of H-atom is -E, what is the energy of the electron in the Bohr's first orbit?

• 2)

Match the list I with List II and select the correct answer using. the code given below the lists.

 List I List II A.Element with first highest ionization enthalpy 1.Fluorine B.Element with second highest ionization enthalpy 2.Chlorine C.Element with highest  electron gain enthalpy 3.Sodium D.Element with highest electronegativity 4.Neon
• 3)

The number of d- electrons in Fe+2 (Z = 26) is not equal to the number of electrons in which one of the following?

• 4)

Which one of the following is called halogen family?

• 5)

Consider the following statements.
(i) Oxidation character increases from left to right in a period.
(ii) Reducing character increases from left to right in a period.
(iii) Metallic character increases from left to right in a period.
Which of the above statement is/are not correct?

#### 11th Standard Chemistry English Medium Free Online Test 1 Mark Questions 2020 - Part Two - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

Assertion: Two mole of glucose contains 12.044 x 1023 molecules of glucose
Reason: Total number of entities present in one mole of any substance is equal to 6.02 x 1022

• 2)

The oxidation number of oxygen in O2 is _______________

• 3)

Identify the correct statements with reference to the given reaction
P4 + 3OH- + 3H2O $\longrightarrow$ PH3 + 3H2PO2-
(i) Phosphorous is undergoing reduction only
(ii) Phosphorous is undergoing oxidation only
(iii) Phosphorous is undergoing both oxidation and reduction.
(iv) Hydrogen is undergoing neither oxidation nor reduction.

• 4)

Consider the following statements
i) Matter possesses mass.
ii) 22-carat gold is a mixture.
iii) Dry ice is a compound.
Which of the following statement(s) given above is/ are correct?

• 5)

The characteristic feature of orderly arrangement of molecules belongs to

#### 11th Standard Chemistry English Medium Free Online Test One Mark Questions with Answer Key 2020 - Part Two - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

7.5 g of a gas occupies a volume of 5.6 litres at 0° C and 1 atm pressure. The gas is

• 2)

Rusting of iron articles is an example of ___________ reaction

• 3)

Which of the following is a mono-atomic molecule?

• 4)

The oxidation number of Cr in K2Cr2O7 is ___________.

• 5)

The number of nodes in s orbital of any energy level is equal to

#### 11th Standard Chemistry English Medium Free Online Test 1 Mark Questions 2020 - Part Three - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

How many molecules of hydrogen is required to produce 4 moles of ammonia?

• 2)

The molar mass of Na2SO4 is.....

• 3)

Shape of an orbital is given by

• 4)

Assertion (A): Angular momentum of an electron in an atom is quantized
Reason (R): In an atom only those orbits are permitted in which angular momentum of the electron is natural number multiple of $\frac { h }{ 2\pi }$

• 5)

Consider the following statements.
(i) The region where the probability density of electron is zero, called nodal surface.
(ii) The probability of finding the electron is independent of the direction of the nucleus.
(iii) The number of radial nodes is equal to n + 1+ 1
Which of the above statements is/are correct?

#### 11th Standard Chemistry English Medium Free Online Test One Mark Questions with Answer Key 2020 - Part Three - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

Which one of the following is the standard for atomic mass?

• 2)

Consider the following statements
1.$\lambda$ .= h / mv is valid only when the particle travels at speed much less than the speed of light.
2. Einstein's mass-energy relationship is E=mc2
3. The angular momentum (mvr) ofthe electron must be equal to an integral multiple of h/4$\pi$ . Which of the following statementts) given above is/ are correct?

• 3)

Assertion: Helium has the highest value of ionization energy among all the elements known
Reason: Helium has the highest value of electron affinity among all the elements known

• 4)

Which of the following statements are correct?
(i) Helium has the highest first ionisation enthalpy
(ii) Chlorine has less electron affinity than fluorine
(iii) Ne has more ionisation energy than Boron.
(iv) The ionisation energy noble gases of zero

• 5)

Which one of the following is the first transition series?

#### 11th Standard Chemistry English Medium Free Online Test 1 Mark Questions 2020 - Part Four - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

Presence of which cation makes the water hard in nature?

• 2)

Which of the following is produced by bombardment of neutrons with lithium?

• 3)

Hydrogen combines with carbon monoxide in the presence of copper catalyst will synthesise-------

• 4)

Rubidium belongs to______group of metals

• 5)

Which of the following oxides is the most basic in nature?

#### 11th Standard Chemistry English Medium Free Online Test One Mark Questions with Answer Key 2020 - Part Four - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

Hot concentrated sulphuric acid is a moderately strong oxidizing agent. Which of the following reactions does not show oxidising behaviour?

• 2)

Which of the following pairs of d-orbitals will have electron density along the axes ?

• 3)

Which of the following expressions represents the electron probability function?

• 4)

Which of the following elements will have the highest electro negativity

• 5)

The most electronegative element of the periodic table is _______

#### 11th Standard Chemistry English Medium Free Online Test One Mark Questions with Answer Key 2020 - Part Five - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

Atomicity of nitrogen is

• 2)

The maximum number of electrons in a sub shell is given by the expression

• 3)

Consider the following statements.
(i) The region where the probability density of electron is zero, called nodal surface.
(ii) The probability of finding the electron is independent of the direction of the nucleus.
(iii) The number of radial nodes is equal to n + 1+ 1
Which of the above statements is/are correct?

• 4)

Pd has exceptional electronic configuration of 4d10 5s0 It belongs to period ______ and group _____

• 5)

Find the incorrect statement.

#### 11th Standard Chemistry English Medium Free Online Test 1 Mark Questions 2020 - Part Six - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

The equivalent mass of a trivalent metal element is 9 g eq-1 the molar mass of its anhydrous oxide is

• 2)

Match list I with list II and identify the correct code.

List I List II
A Bronze 1 Element
B Table Salt 2 Homogeneous mixture
C Gold 3 Alloy
D Petrol 4 Compound
• 3)

One 'U' stands for the mass of

• 4)

How many moles of magnesium phosphate Mg3(PO4)2 Will Contain 0.25 moles of oxygen atoms?

• 5)

How many electrons in an atom with atomic number 105 can have (n + I) = 8 ?

#### 11th Standard Chemistry English Medium Free Online Test One Mark Questions with Answer Key 2020 - Part Six - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

Consider the following statements.
(i) d-block elements show variable oxidate states.
(ii) Mostly d-block elements form colourless compounds.
(iii) Mostly d-block elements are diamagnetic due to paired electrons.
Which of the above statement is/are not correct?

• 2)

Which of the following is not a periodic property?

• 3)

FeSO4 contains _________ molecules of water of hydration.

• 4)

Consider the following statements.
(i) Silver, Gold, Mercury and Platinum do not have any effect on water.
(ii) Carbon, Sulphur and Phosphorous do not react with water.
(iii) Beryllium reacts with water less violently.
Which of the following statements is/are not correct?

• 5)

Assertion : Beryllium compounds are covalent in nature
Reason : The size of Be2+ ion is larger in comparison to the radii of the other divalent ions of alkaline earth metals.

#### 11th Standard Chemistry English Medium Free Online Test 1 Mark Questions 2020 - Part Seven - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

Two electrons occupying the same orbital are distinguished by

• 2)

Halogens belong to the

• 3)

In the modern periodic table, the period indicates the value of____

• 4)

Various successive ionisation enthalpies (in kJ mol-1) of an element are given below.

 IE1 IE2 IE3 IE4 IE5 577.5 1,810 2,750 11,580 14,820

The element is

• 5)

In which.of the following reactions H2O2 act as a reducing agent?
(i)H2O2 + 2H+ + 2e $\rightarrow$ 2H2O
(ii) H2O2 - 2e $\rightarrow$ O2 + 2H+
(iii) H2O2 + 2e $\rightarrow$ 2OH-
(iv) H2O2 + 2OH- - 2e $\rightarrow$ O2 + 2H2O

#### 11th Standard Chemistry English Medium Free Online Test One Mark Questions with Answer Key 2020 - Part Seven - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

Assertion: The atomic masses of most of the elements. are in the fraction.
Reason:  The atomic mass represents the ratio of the average mass of the atom to one avogram.

• 2)

One mole of CO2 contains:

• 3)

Which of the following electronic configuration represent the element in ground state?

• 4)

J. J. Thomson's cathode ray experiment revealed that atoms consist of

• 5)

The maximum number of electrons that can be accommodated in N shell is_____________

#### 11th Standard Chemistry English Medium Free Online Test 1 Mark Questions 2020 - Part Eight - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

Consider the following statements regarding Rutherford's $\alpha$-ray scattering experiment.
i. Most of the $\alpha$-particles were deflected through a small angle.
ii. Some of $\alpha$-particles passed through the foil.
iii. Very few $\alpha$-particles were reflected back by 180o.
Which of the above statements is/are not correct.

• 2)

The element which does not contain a neutron is

• 3)

Which of the following is named as perhydrol and used as an antiseptic?

• 4)

Which of the following is insoluble in water?

• 5)

Which one of the following is more basic?

#### 11th Standard Chemistry English Medium Free Online Test One Mark Questions with Answer Key 2020 - Part Eight - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

Atoms are too small with a diameter of 10-10 m and weigh approximately

• 2)

The fixed circular paths around the nucleus are caused _

• 3)

Which of the following is Dobereiner's triad?

• 4)

The atomic weight of Au is ______

• 5)

The vertical columns in the periodic table are called as

#### 11th Standard Chemistry English Medium Free Online Test 1 Mark Questions 2020 - Part Nine - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

When 6.3g of sodium bicarbonate is added to 30g of the acetic acid solution, the residual solution is found to weigh 33g. The number of moles of carbon dioxide released in the reaction is

• 2)

Which of the following is/are true with respect to carbon -12

• 3)

If a beaker holds 576g of water, what will be the gram molecules of water in that beaker?

• 4)

In redox reaction which of the following Is true?

• 5)

Consider the following statements
1.$\lambda$ .= h / mv is valid only when the particle travels at speed much less than the speed of light.
2. Einstein's mass-energy relationship is E=mc2
3. The angular momentum (mvr) ofthe electron must be equal to an integral multiple of h/4$\pi$ . Which of the following statementts) given above is/ are correct?

#### 11th Standard Chemistry English Medium Free Online Test One Mark Questions with Answer Key 2020 - Part Nine - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

• 2)

Consider the following statements and pick the incorrect statement(s).
1.Schrodinger wave equation is used to determine the probability of finding a electron at a given point in space.
2.The energy of a electron at infinity is positive
3.Angular momentum quantum number gives information regarding subshells.

• 3)

Which of the following process is important in food industry?

• 4)

In chelating method of softening of hard water ----------- is used

• 5)

Which one of the following is known as Hydrogen sponge?

#### 11th Standard Chemistry English Medium Free Online Test 1 Mark Questions 2020 - Part Ten - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

7.5 g of a gas occupies a volume of 5.6 litres at 0° C and 1 atm pressure. The gas is

• 2)

How many moles of water is present in lL of water?

• 3)

Assertion: The spectrum of Heis expected to be similar to that of hydrogen
Reason: He is also one electron system.

• 4)

The orbital diagram in which both the Pauli's exclusion principle and Hund's rule are violated is:

• 5)

Which of the following factor decreases across the period?

#### 11th Standard Chemistry English Medium Free Online Test One Mark Questions with Answer Key 2020 - Part Ten - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

What is the mass of precipitate formed when 50 ml of 8.5 % solution of AgNO3 is mixed with 100 ml of 1.865 % potassium chloride solution?

• 2)

Which of the following pairs of d-orbitals will have electron density along the axes ?

• 3)

Which of the following electronic configuration represent the element in ground state?

• 4)

Electron density in the yz plane of 3dxy-y2 orbital is

• 5)

J. J. Thomson's cathode ray experiment revealed that atoms consist of

#### 11th Standard Chemistry Environmental Chemistry English Medium Free Online Test 1 Mark Questions with Answer Key 2020 - 2021 - by Uma - Nagapattinam - Nov 10, 2020 - View & Read

• 1)

Which of the following is natural and human disturbance in ecology?

• 2)

Ozone depletion will cause

• 3)

Living in the atmosphere of CO is dangerous because it

• 4)

Biochemical oxygen Demand value less than 5 ppm indicates a water sample to be

• 5)

Assertion (A): Excessive use of chlorinated pesticide causes soil and water pollution.
Reason (R) : Such pesticides are non-biodegradable.

#### 11th Standard Chemistry English Medium Model Question Paper Part V - by Uma - Nagapattinam - May 27, 2020 - View & Read

• 1)

What will be the basicity of H3BO3, which is not a protic acid?

• 2)

The energy of an electron in the 3rd orbit of hydrogen atom is -E. The energy of an electron in the first orbit will be

• 3)

Match the list-I and list-II using the correct code given below the list.

 List-I List-II A. Li 1. 2,8,8,1 B. Na 2. 2,1 C. K 3. 2,8,18,18,8,1 D. Cs 4. 2,8,1
• 4)

Water gas is

• 5)

Plaster of Paris is obtained by heating gypsum to ______

#### 11th Standard Chemistry English Medium Model Question Paper Part IV - by Uma - Nagapattinam - May 27, 2020 - View & Read

• 1)

Equivalent mass of KMnO4 in acidic medium, concentrated alkaline medium and dilute basic medium respectively are $M\over5$ , M, M. Reduced products can be:

• 2)

Which of the following pairs of d-orbitals will have electron density along the axes ?

• 3)

Gadolinium belong to '4f series.Its atomic number is 64. Which of the following is the correct electronic configuration of gadolinium?

• 4)

Water is a

• 5)

Which of the following are stored under oil?

#### 11th Standard Chemistry English Medium Model Question Paper Part III - by Uma - Nagapattinam - May 27, 2020 - View & Read

• 1)

Identify the correct statement(s) with respect to the following reaction :
Zn + 2HCl $\longrightarrow$ ZnCl2 + H2
(i) Zinc is acting as an oxidant
(ii) Chlorine is acting as a reductant
(iii) Hydrogen is not acting as an oxidant
(iv) Zn is acting as a reductant

• 2)

A macroscopic particle of mass 100 g and moving at a velocity of 100 cm S-1 will have a de Broglie wavelength of

• 3)

On moving from left to right across a period in the periodic table, the metallic character__________.

• 4)

Zeolite used to soften hardness of water is hydrated

• 5)

Which one of the following is known as natural insulator?

#### 11th Standard Chemistry English Medium Model Question Paper Part II - by Uma - Nagapattinam - May 27, 2020 - View & Read

• 1)

The compound in which mass percentage of carbon is 75% and that of hydrogen is 25% is

• 2)

Based on equation E = $-2.178\times { 10 }^{ -18 }J\left( \frac { { Z }^{ 2 } }{ { n }^{ 2 } } \right)$certain conclusions are written. Which of them is not correct?

• 3)

The first list of 23 chemical elements was published by _____ in the year 1789.

• 4)

Volume strength of 1.5 N H2O2 is

• 5)

The reducing power of a metal depends on various factors. Suggest the factor. which makes Li, the strongest reducing agent in aqueous solution

#### 11th Standard Chemistry English Medium Model Question Paper Part I - by Uma - Nagapattinam - May 27, 2020 - View & Read

• 1)

12 g of carbon-12 contains_____carbon atoms

• 2)

A macroscopic particle of mass 100 g and moving at a velocity of 100 cm S-1 will have a de Broglie wavelength of

• 3)

Electronegativity of the following elements increases in the order

• 4)

Non-stoichiometric hydrides are formed by

• 5)

Match the list-I and list-Il using the correct code given below the list.

List-I List-II
A Manufacture of soap 1 Na2CO3.10H2O
B Mild antiseptic 2 Liquid Na metal
C Softening of hard water 3 NaOH
D Coolant in nuclear reactor 4 NaHCO3

#### 11th Standard Chemistry English Medium Public Exam Model Question Paper June 2020 - by Uma - Nagapattinam - May 26, 2020 - View & Read

• 1)

Identify the incorrect statement about a compound.

• 2)

The ratio of de Broglie wavelengths of a deuterium atom to that of an u - particle, when the velocity of the former is five times greater than that of later, is

• 3)

Which of the following N3-, O2-, F- is largest in size?

• 4)

Non-stoichiometric hydrides are formed by

• 5)

Half life of francium is _______

#### 11th Standard Chemistry One Mark important Questions Book back and Creative - 2020 - by Uma - Nagapattinam - Mar 20, 2020 - View & Read

• 1)

Carbon forms two oxides, namely carbon monoxide and carbon dioxide. The equivalent mass of which element remains constant?

• 2)

Two 22.4 litre containers A and B contains 8 g of O2 and 8 g of SO2 respectively at 273 K and 1 atm pressure, then

• 3)

In the reaction to NH3 + H2$\longrightarrow$ ${ NH }_{ 4 }^{ + }+O\overline { H }$, NH3 is acidic in. the reason for its acidic is_____

• 4)

7.5g of a gas occupy 5.6 litres of volume at STP. The gas:

• 5)

The energy of an electron in the 3rd orbit of hydrogen atom is -E. The energy of an electron in the first orbit will be

#### 11th Chemistry - Full Portion Five Marks Question Paper - by 8682895000 - Jan 21, 2020 - View & Read

• 1)

The reaction between aluminum and ferric oxide can generate temperatures up to 3273 K and is used in welding metals. (Atomic mass of AC = 27 u atomic mass of O = 16 u )
2Al + Fe2O3 $\longrightarrow$ Al2O3 + 2Fe;  If in this process, 324 g of aluminum is allowed to react with 1.12 kg of ferric oxide
i) Calculate the mass of Al2O3 formed
ii) How much of the excess reagent is left at the end of the reaction?

• 2)

Explain the steps involved in ion-electron method for balancing redox reaction.

• 3)

What is the de Broglie wavelength (in cm) of a 160g cricket ball travelling at 140 Km hr-1.

• 4)

What is the de Broglie wave length of an electron, which is accelerated from the rest, through a potential difference of 100V?

• 5)

What are the factors influencing ionization enthalpy.

#### 11th Chemistry - Full Portion Three Marks Question Paper - by 8682895000 - Jan 21, 2020 - View & Read

• 1)

Calculate the amount of water produced by the combustion of 32 g of methane.

• 2)

Show that the circumference of the Bohr orbit for the hydrogen atom is an integral multiple of the de Broglie wave length associated with the electron revolving arround the nucleus.

• 3)

What is water-gas shift reaction?

• 4)

How do you expect the metallic hydrides to be useful for hydrogen storage?

• 5)

Write a note about ortho water and para water.

#### 11th Chemistry - Full Portion Two Marks Question Paper - by 8682895000 - Jan 21, 2020 - View & Read

• 1)

What do you understand by the term mole

• 2)

Define equivalent mass

• 3)

Balance the following equations by oxidation number method - ${ K }Mno_{ 4 }+{ Na }_{ 2 }{ So }_{ 3 }\longrightarrow { MnO }_{ 2 }+{ Na }_{ 2 }{ So }_{ 4 }+KOH$

• 4)

Which atom is considered to be a standard atom by 1UPAC to measure atomic masses and what is its atomic mass?

• 5)

Calculate the equivalent mass of the following - Sodium Hydroxide

#### 11th Chemistry - Revision Model Question Paper 2 - by Uma - Nagapattinam - Jan 17, 2020 - View & Read

• 1)

The oxidation number of fluorine in all its compounds is equal to

• 2)

Which of the following does not represent the mathematical expression for the Heisenberg uncertainty principle?

• 3)

Match the list-I and list-II using the correct code given below the list.

 List-I List -II A. Jewels 1. 1.Sodium chloride B. Bolts and cot 2. Copper C. Table salt 3. Gold D. Utensils 4. Iron
• 4)

Non-stoichiometric hydrides are formed by

• 5)

Consider the following statements.
(i) Alkali metals exhibit high chemical reactivity due to their low ionization energy.
(ii) Lithium is a very soft metal and even it can be cut with a knife.
(iii) Francium is a radioactive element in group 1 elements
Which of the above statements is/are not correct?

#### 11th Chemistry - Public Exam Model Question Paper 2019 - 2020 - by Uma - Nagapattinam - Jan 17, 2020 - View & Read

• 1)

The number of molecules in 16g of methane is:

• 2)

Splitting of spectral lines in an electric field is called

• 3)

d-block elements form _____ compounds.

• 4)

Water gas is

• 5)

Consider the following statements
1. Alkali metals are soft.
2. Alkali metals show high reactivity
3. I.E of alkali metal decreases down the group
Which of the following statement(s) given above is/ are correct?

#### 11th Chemistry - Environmental Chemistry Model Question Paper - by Uma - Nagapattinam - Dec 14, 2019 - View & Read

• 1)

Which one of the followings affects chlorophyll?

• 2)

Green house gases cause

• 3)

Pick the viable pollutant among the following.

• 4)

Statement I: Photochemical smog is also known as oxidizing smog.
Statement II: Photochemical smog .is chiefly composed of O3, PAN, etc

• 5)

Which causes water pollution?

#### 11th Chemistry - Haloalkanes and Haloarenes Model Question Paper - by Uma - Nagapattinam - Dec 14, 2019 - View & Read

• 1)

Which of the following is secondary alkyl halide?

• 2)

Grignard reagent is prepared by between___________.

• 3)

Among the following, which is not an allylic halide?

• 4)

The order of stability of the carbonium ion is__________.

• 5)

___________is used in fire extinguishers

#### 11th Chemistry - Hydrocarbons Model Question Paper - by Uma - Nagapattinam - Dec 14, 2019 - View & Read

• 1)

C6H5CH2CH2CH3 is when oxidised in the presence of alke . kMnO4, the product obtained is

• 2)

The number of axial hydrogen atoms in chair form of cyclohexane is

• 3)

Torsion strain is the repulsive interaction between

• 4)

In E1,reaction, the intermediate formed is

• 5)

How many structural isomers are possible for the molecular formula C4H8 which can undergo ozonolysis?

#### 11th Chemistry - Basic Concept of Organic Reactions Model Question Paper - by Uma - Nagapattinam - Dec 14, 2019 - View & Read

• 1)

The most stable carbocation is

• 2)

The most stable carbanion is

• 3)

: CH2 is an

• 4)

The electromeric effect is

• 5)

The stability of alkyl free radicals is due to

#### 11th Chemistry - Fundamentals of Organic Chemistry Model Question Paper - by Uma - Nagapattinam - Dec 14, 2019 - View & Read

• 1)

The compound which has one isopropyl group is

• 2)

The number of chain isomers possible in C5 HI2 is

• 3)

Number of structural isomers possible in C3H6O are

• 4)

Principle behind crystallization is

• 5)

What is the method involved in purification of chloroform and aniline?

#### 11th Chemistry - Chemical bonding Model Question Paper - by Uma - Nagapattinam - Dec 14, 2019 - View & Read

• 1)

Find out the most favourable condition for electrovalent bonding.

• 2)

The sharing of valence electrons between the atoms will lead to the formation of_____

• 3)

Which compound has planar structure?

• 4)

H2O is polar, whereas BeF2 is not It is because

• 5)

Which of the following is a polar molecule?

#### 11th Chemistry - Solutions Model Question Paper - by Uma - Nagapattinam - Dec 14, 2019 - View & Read

• 1)

Vapour pressure is the pressure exerted by vapours

• 2)

A sample of toothpaste weighting 500g, on analysis was found to contain 0.2g of fluorine. The concentration of fluorine in ppm is

• 3)

For associative solutes

• 4)

For a non-electrolytic solution

• 5)

The normality of 10% weight/volume) acetic and is

#### 11th Chemistry - Physical and Chemical Equilibrium Model Question Paper - by Uma - Nagapattinam - Dec 14, 2019 - View & Read

• 1)

Solubility of carbon dioxide gas in cold water can be increased by

• 2)

Which one of the following is incorrect statement?

• 3)

Hydrogen (a moles) and iodine (b moles) .react to give 2x moles of the HI at equilibrium. The total number of moles at equilibrium is

• 4)

XY2 dissociates as,$XY_{ 2\left( g \right) }\rightleftharpoons { XY }_{ \left( g \right) }+Y_{ \left( g \right) }$ Initial pressure of XY2 is 600mm Hg. The total pressure at equilibrium is 800mm Hg. Assuming volume of system to remain constant, the value of Kp is

• 5)

A state of equilibrium is reached when

#### 11th Chemistry - Thermodynamics Model Question Paper - by Uma - Nagapattinam - Dec 14, 2019 - View & Read

• 1)

• 2)

Which among the following is an intensive property?

• 3)

For an isochoric process, ΔU=-----

• 4)

If the heat flows out of the system into the surrounding, the q value becomes -------

• 5)

The extensive and intensive properties respectively are

#### 11th Chemistry - Gaseous State Model Question Paper - by Uma - Nagapattinam - Dec 14, 2019 - View & Read

• 1)

Pressure is _____________

• 2)

The standard atmospheric pressure is the pressure that supports a column of mercury exactly ___________ high at 0° C at sea level.

• 3)

The mathematical expression V$\infty$ n relates to _____________

• 4)

Pick the equation that gives you the relationship between molecular mass and density.

• 5)

When the gas behaves ideally, the compression factor Z is

#### 11th Chemistry - Periodic Classification Of Elements Model Question Paper - by Uma - Nagapattinam - Nov 27, 2019 - View & Read

• 1)

The electronic configuration of the elements A and Bare 1s2, 2s 2,2p6,3s2 and 1s2, 2s2,2p5 respectively. The formula of the ionic compound that can be formed between these elements is

• 2)

The group of elements in which the differentiating electron enters the anti penultimate shell of atoms are called

• 3)

Period of an element is represented by _____ quantum number

• 4)

The first list of 23 chemical elements was published by _____ in the year 1789.

• 5)

In the third period the first ionization potential is of the order.

#### 11th Chemistry - Hydrogen Model Question Paper - by Uma - Nagapattinam - Nov 27, 2019 - View & Read

• 1)

Water gas is

• 2)

If a body of a fish contains 1.2 g hydrogen in its total body mass, if all the hydrogen is replaced with deuterium then the increase in body weight of the fish will be

• 3)

The cause of permanent hardness of water is due to

• 4)

Deuterium consist of _____________

• 5)

The radioactive isotope of hydrogen is __________

#### 11th Chemistry - Alkali and Alkaline Earth Metals Model Question Paper - by Uma - Nagapattinam - Nov 27, 2019 - View & Read

• 1)

For alkali metals, which one of the following trends is incorrect?

• 2)

Which of the following compounds will not evolve H2 gas on reaction with alkali metals?

• 3)

Lithium shows diagonal relationship with

• 4)

The radioactive element of group 1 is ______

• 5)

Half life of francium is _______

#### 11th Chemistry - Quantum Mechanical Model of Atom Important Questions - by Uma - Nagapattinam - Nov 21, 2019 - View & Read

• 1)

The energies E1and E2 of two radiations are 25 eV and 50 eV respectively. The relation between their wavelengths ie $\lambda$1 and$\lambda$2 will be

• 2)

For d-electron, the orbital angular momentum is

• 3)

The subsidiary quantum number decides ______

• 4)

Which of the following configuration is correct for iron?

• 5)

How many electrons in an atom with atomic number 105 can have (n + I) = 8 ?

#### 11th Chemistry - Basic Concepts of Chemistry and Chemical Calculations Important Questions - by Uma - Nagapattinam - Nov 21, 2019 - View & Read

• 1)

An element X has the following isotopic Composition 200X = 90%, 199X = 8% and 202X = 2% The Weighted average atomic mass of the element X is closet to

• 2)

When 6.3g of sodium bicarbonate is added to 30g of the acetic acid solution, the residual solution is found to weigh 33g. The number of moles of carbon dioxide released in the reaction is

• 3)

Fe2 + $\longrightarrow$ Fe3+ + e- is a ________ reaction.

• 4)

7.5 g of a gas occupies a volume of 5.6 litres at 0° C and 1 atm pressure. The gas is

• 5)

Among the three metals, zinc, copper and silver, the electron releasing tendency decreases in the following order.

#### 11th Chemistry - Half Yearly Model Question Paper 2019 - by Uma - Nagapattinam - Nov 12, 2019 - View & Read

• 1)

40 ml of methane is completely burnt using 80 ml of oxygen at room temperature The volume of gas left. after cooling to room temperature is

• 2)

Two electrons occupying the same orbital are distinguished by

• 3)

Law of triad was unable to explain for the element

• 4)

Heavy water is used as

• 5)

The suspension of slaked lime in water is known as

#### 11th Standard Chemistry - Term II Model Question Paper - by Kumar - Pollachi - Oct 30, 2019 - View & Read

• 1)

Carbon forms two oxides, namely carbon monoxide and carbon dioxide. The equivalent mass of which element remains constant?

• 2)

Splitting of spectral lines in an electric field is called

• 3)

What would be the IUPAC name for an element with atomic number 222?

• 4)

Ionic hydrides are formed by

• 5)

Zeolite used to soften hardness of water is hydrated

#### 11th Standard Chemistry - Environmental Chemistry Model Question Paper - by Kumar - Pollachi - Oct 12, 2019 - View & Read

• 1)

Which of the following is natural and human disturbance in ecology?

• 2)

The pH of normal rain water is

• 3)

Release of oxides of nitrogen and hydrocarbons into the atmosphere by motor vehicles is prevented by using __________

• 4)

Biochemical oxygen Demand value less than 5 ppm indicates a water sample to be

• 5)

Which among the following is a green house gas?

#### 11th Standard Chemistry - Haloalkanes and Haloarenes Model Question Paper - by Kumar - Pollachi - Oct 12, 2019 - View & Read

• 1)

With respect to the position of – Cl in the compound CH3 – CH = CH – CH2 – Cl, it is classified as

• 2)

What should be the correct IUPAC name of diethyl chloromethane?

• 3)

Benzene reacts with Cl2 in the presence of FeCl3 and in absence of sunlight to form

• 4)

Freon-12 is manufactured from tetrachloro methane by

• 5)

The carbo cation formed in SN1 reaction of al kyl halide in the slow step is

#### 11th Standard Chemistry - Environmental Chemistry Three Marks Questions - by Uma - Nagapattinam - Oct 09, 2019 - View & Read

• 1)

Dissolved oxygen in water is responsible for aquatic life. What processes are responsible for the reduction in dissolved oxygen in water?

• 2)

From where does ozone come in the photo chemical smog?

• 3)

Even though the use of pesticides increases the crop production, they adversely affect the living organisms. Explain the function and the adverse effects of the pesticides.

• 4)

On the basis of chemical reactions involved, explain how do CFC’s cause depletion of ozone layer in stratosphere?

• 5)

Explain how oxygen deficiency is caused by carbon monoxide in our blood? Give its effect

#### 11th Standard Chemistry - Haloalkanes and Haloarenes Three Marks Questions - by Uma - Nagapattinam - Oct 09, 2019 - View & Read

• 1)

An organic compound (A) with molecular formula C2H5Cl reacts with KOH gives compounds (B) and with alcoholic KOH gives compound (C). Identify (A),(B), and (C)

• 2)

Simplest alkene (A) reacts with HCl to form compound (B).Compound (B) reacts with ammonia to form compound (C) of molecular formula C2H7N.Compound (C) undergoes carbylamine test. Identify (A), (B), and (C)

• 3)

A hydrocarbon C3H6 (A) reacts with HBr to form compound (B). Compound (B) reacts with aqueous potassium hydroxide to give (C) of molecular formula C3H6O.what are (A) (B) and (C). Explain the reactions.

• 4)

Two isomers (A) and (B) have the same molecular formula C2H4Cl2. Compound (A) reacts with aqueous KOH gives compound (C) of molecular formula C2H4O. Compound (B) reacts with aqueous KOH gives compound(D) of molecular formula C2H6O2. Identify (A), (B), (C) and (D).

• 5)

Enlist the applications of haloalkanes.

#### 11th Chemistry - Hydrocarbons Three Marks Questions - by Uma - Nagapattinam - Oct 09, 2019 - View & Read

• 1)

How many types of polymerisation are·possible in alkynes?

• 2)

State Huckel's rule of aromaticity and explain it interms of cyclopentadiene, cycloxtateraene and cyclopropenylcation.

• 3)

• 4)

What are vicinal dihalides? How will you prepane alkene from vicinal dihaldes?

• 5)

Why alkenes are more reactive than alkanes?

#### 11th Chemistry - Basic Concept of Organic Reactions Three Marks Questions - by Uma - Nagapattinam - Oct 09, 2019 - View & Read

• 1)

While writing the resonance structures, what are the rules to be followed?

• 2)

Distinguish between electrophiles and nucleophiles

• 3)

What are the possible types of electron movement? Represent them by clearly indicating the electron shift.

• 4)

Discuss the reason behind the classification of inductive effect into +I and -I effect.

• 5)

Explain the substitution reaction in detail with suitable examples.

#### 11th Chemistry - Fundamentals of Organic Chemistry Three Marks Questions - by Uma - Nagapattinam - Oct 09, 2019 - View & Read

• 1)

Write structural formula for the following compounds
(i) Cyclohexa-1, 4-diene
(ii) Ethynyl cyclohexane.

• 2)

Write structural formula for the following compounds
(i) m - dinitrobenzene
(ii) p-dichloro benzene
(iii)1, 3, 5- Trimethyl benzene.

• 3)

Write all the possible isomers of molecular formula C4H10O and identify the isomerisms found in them.

• 4)

In an estimation of sulphur by carius method, 0.2175 g of the substance gave 0.5825 g of BaSO4 calculate the percentage composition of S in the compound.

• 5)

0.16 g of an organic compound was heated in a carius tube and H2SO4 acid formed was precipitated with BaCl2. The mass of BaSO4 was 0.35g. Find the percentage of sulphur [30.04]

#### 11th Chemistry - Chemical Bonding Three Marks Questions - by Uma - Nagapattinam - Oct 09, 2019 - View & Read

• 1)

What is covalent bond? Give suitable examples to represent single, double and triple covalent bonds.

• 2)

Define co-ordinate covalent bond.

• 3)

Bond angle in PH+4 is higher than in PH3. Why?

• 4)

Compare the bond angles of water and dimethyl ether and identify which one has the greater bond angle? Give appropriate reason for your answer

• 5)

Identify tbe paramagnetic species among following using molecular orbital theory.

#### 11th Chemistry - Solutions Three Marks Questions - by Uma - Nagapattinam - Oct 09, 2019 - View & Read

• 1)

If 5.6 g of KOH is present in (a) 500 mL and (b) 1 litre of solution, calculate the molarity of each of these solutions.

• 2)

Describe how would you prepare the following solution from pure solute and solvent
(a) 1 L of aqueous solution of 1.5 M CoCl2.
(b) 500 mL of 6.0% (V/V) aqueous methanol solution.

• 3)

Vapour pressure of a pure liquid A is 10.0 torr at 27°C. The vapour pressure is lowered to 9.0 torr on dissolving one gram of B in 20 g of A. If the molar mass of A is 200 then calculate the molar mass of B.

• 4)

An aqueous solution of 2% nonvolatile solute exerts a pressure of 1.004 bar at the boiling point of the solvent. What is the molar mass of the solute when PA is 1.013 bar?

• 5)

Ethylene glycol (C2H6O2) can be at used as an antifreeze in the radiator of a car. Calculate the temperature when ice will begin to separate from a mixture with 20 mass percent of glycol in water used in the car radiator. Kf for water = 1.86 K Kg mol-1 and molar mass of ethylene glycol is 62 g mol-1.

#### 11th Chemistry - Physical and Chemical Equilibrium Three Marks Questions - by Uma - Nagapattinam - Oct 09, 2019 - View & Read

• 1)

The value of Kc for the following reaction at 717 K is 48.

• 2)

The value of Kc for the reaction

• 3)

One mole of H2 and one mole of I2 are allowed to attain equilibrium. If the equilibrium mixture contains 0.4 mole of HI. Calculate the equilibrium constant.

• 4)

The equilibrium concentrations of NH3, N2 and H2 are 1.8 × 10-2 M, 1.2 × 10-2 M and 3 × 10-2 M respectively. Calculate the equilibrium constant for the formation of NH3 from N2 and H2. [Hint: M= mol lit-1]

• 5)

For an equilibrium reaction Kp = 0.0260 at 25° C ΔH= 32.4 kJmol-1, calculate Kp at 37° C

#### 11th Standard Chemistry - Hydrocarbons Model Question Paper - by Kumar - Pollachi - Oct 09, 2019 - View & Read

• 1)

Which of the following is optically active

• 2)

The compound that will react most readily with gaseous bromine has the formula

• 3)

The major product formed when 2 – bromo – 2 – methyl butane is refluxed with ethanolic KOH is

• 4)

Some meta-directing substituents in aromatic substitution are given. Which one is most deactivating?

• 5)

An alkane is obtained by decarboxylation of sodium propionate. Same alkane can be prepared by

#### 11th Chemistry - Basic concept of organic reactions Model Question Paper - by Kumar - Pollachi - Oct 09, 2019 - View & Read

• 1)

What is the hybridisation state of benzyl carbonium ion?

• 2)

Which of the following species is not electrophilic in nature?

• 3)

Which of the group has highest +I effect?

• 4)

Which of the following carbocation will be most stable?

• 5)

The geometrical shape of carbocation is

#### 11th Standard Chemistry - Thermodynamics Three Marks Questions - by Uma - Nagapattinam - Oct 04, 2019 - View & Read

• 1)

State the various statements of second law of thermodynamics.

• 2)

1 mole of an ideal gas, maintained at 4.1 atm and at a certain temperature, absorbs heat 3710 J and expands to 2 litres. Calculate the entropy change in expansion process.

• 3)

At 33K, N2O4 is fifty percent dissociated. Calculate the standard free energy change at this temperature and at one atmosphere

• 4)

The standard enthalpies of formation of SO2 and SO3 are -297 kJ mol-1 and -396 kJ mol-1 respectively. Calculate the standard enthalpy of reaction for the reaction: SO2 + $\frac{1}{2}$O2⟶SO3

• 5)

For the reaction at 298 K: 2A +B ⟶ C.  ΔH = 400 J mol-1; ΔS = 0.2 JK-1 mol-1 Determine the temperature at which the reaction would be spontaneous.

#### 11th Standard Chemistry - Periodic Classification Of Elements Three Marks Questions - by Uma - Nagapattinam - Oct 04, 2019 - View & Read

• 1)

Energy of an electron in the ground state of the hydrogen atom is -2.8 x 10-18 J. Calculate the ionisation enthalpy of atomic hydrogen in terms of kJ mol-1.

• 2)

The electronic configuration of atom is one of the important factor which affects the value of ionisation potential and electron gain enthalpy. Explain.

• 3)

In what period and group will an element with Z = 118 will be present?

• 4)

Justify that the fifth period of the periodic table should have 18 elements on the basis of quantum numbers.

• 5)

Elements a, b, c and d have the following electronic configurations:
a: 1s2, 2s2, 2p6
b: 1s2, 2s2, 2p6, 3s2, 3p1
c: 1s2, 2s2, 2p6, 3s2, 3p6
d: 1s2, 2s2, 2p1
Which elements among these will belong to the same group of periodic table.

#### 11th Standard Chemistry - Gaseous State Three Marks Questions - by Uma - Nagapattinam - Oct 04, 2019 - View & Read

• 1)

A sample of gas at 15°C at 1 atm. has a volume of 2.58 dm3. When the temperature is raised to 38°C at 1 atm does the volume of the gas increase? If so, calculate the final volume.

• 2)

A sample of gas has a volume of 8.5 dm3 at an unknown temperature. When the sample is submerged in ice water at 0 °C, its volume gets reduced to 6.37 dm3. What is its initial temperature?

• 3)

Of two samples of nitrogen gas, sample A contains 1.5 moles of nitrogen in a vessel of volume of 37.6 dm3 at 298K, and the sample B is in a vessel of volume 16.5 dm3 at 298K. Calculate the number of moles in sample B.

• 4)

Hydrochloric acid is treated with a metal to produce hydrogen gas. Suppose a student carries out this reaction and collects a volume of 154.4 x 10-3 dm3 of a gas at a pressure of 742 mm of Hg at a temperature of 298 K. What mass of hydrogen gas (in mg) did the student collect?

• 5)

It takes 192 sec for an unknown gas to diffuse through a porous wall and 84 sec for N2 gas to effuse at the same temperature and pressure. What is the molar mass of the unknown gas?

#### 11th Standard Chemistry - Alkali and Alkaline Earth Metals Three Marks Questions - by Uma - Nagapattinam - Oct 04, 2019 - View & Read

• 1)

Write balanced chemical equation for each of the following chemical reactions.
(i) Lithium metal with nitrogen gas
(ii) heating solid sodium bicarbonate
(iii) Rubidum with oxgen gas
(iv) solid potassium hydroxide with CO2
(v) heating calcium carbonate
(vi) heating calcium with oxygen

• 2)

Give the systematic names for the following
(i) milk of magnesia
(ii) lye
(iii) lime
(iv) Caustic potash
(v) washing soda
(vi) soda ash
(vii) trona

• 3)

Mention the uses of plaster of paris

• 4)

Why sodium hydroxide is much more water soluble than chloride?

• 5)

Write the chemical equations for the reactions involved in solvay process of preparation of sodium carbonate.

#### 11th Chemistry - Quantum Mechanical Model of Atom Three Marks Questions - by Uma - Nagapattinam - Oct 04, 2019 - View & Read

• 1)

Which one among the following salts is more stable? Ferrous and ferric salts

• 2)

State and explain pauli's exclusion principle

• 3)

Explain briefly the time independent schrodinger wave equation?

• 4)

Calculate the total number of angular nodes and radial nodes present in 3p-orbital.

• 5)

Describe the Autbau principle

#### 11th Chemistry - Hydrogen Three Marks Questions - by Uma - Nagapattinam - Oct 04, 2019 - View & Read

• 1)

Write the expected formulas for the hydrides of 4th period elements. What is the trend in the formulas? In what way the first two numbers of the series different from the others?

• 2)

Complete the following chemical reactions and classify them in to (a) hydrolysis (b) redox (c) hydration reactions.
(1) KMnO4 + 3H2O2 ➝ 2MnO2+2KOH+2H2O+3O2
(2) CrCl3+H2O ➝
(3) CaO + H2O ➝

• 3)

Hydrogen peroxide can function as an oxidising agent as well as reducing agent. substantiate this statement with suitable examples.

• 4)

What are isotopes? Write the names of isotopes of hydrogen.

• 5)

Give the uses of heavy water,

#### 11th Chemistry - Basic Concepts of Chemistry and Chemical Calculations Three Marks Questions - by Uma - Nagapattinam - Oct 04, 2019 - View & Read

• 1)

In a reaction x + y + Z2 $\longrightarrow$ xyz2 identify the Limiting reagent if any, in the following reaction mixtures.
(a) 200 atoms of x +200 atoms of y + 50 molecules of z2
(b) 1 mol of x + 1 mol of y + 3 mol of z2
(c) 50 atoms of x + 25 atoms of y + 50 molecules of z2
(d) 2.5 mol of x + 5 mol of y + 5 mol of z2

• 2)

Mass of one atom of an element is 6.645 x 10-23g. How many moles of element are there in 0.320 kg.

• 3)

What is the difference between molecular mass and molar mass? Calculate the molecular mass and molar mass for carbon monoxide.

• 4)

What is the empirical formula of the following?
i) Fructose (C6 H12O6) Found in honey
ii) Caffeine  (C8H10N4 O2) a substance found in tea and Coffee

• 5)

How many moles of ethane is required to produce 44 g of CO2(g) after combustion

#### 11th Chemistry - Fundamentals of Organic Chemistry Model Question Paper - by Kumar - Pollachi - Oct 01, 2019 - View & Read

• 1)

Select the molecule which has only one $\pi$ bond.

• 2)

Which one of the following names does not fit a real name?

• 3)

The number of stereoisomers of 1, 2 – dihydroxy cyclopentane

• 4)

Lassaigne’s test for the detection of nitrogen fails in

• 5)

In an organic compound, phosphorus is estimated as

#### 11th Chemistry - Chemical bonding Model Question Paper - by Kumar - Pollachi - Oct 01, 2019 - View & Read

• 1)

In which of the following Compounds does the central atom obey the octet rule?

• 2)

Which of the following is electron deficient?

• 3)

Which one of the following is the likely bond angles of sulphur tetrafluoride molecule?

• 4)

The correct order of O-O bond length in hydrogen peroxide, ozone and oxygen is

• 5)

Xe F2 is isostructural with

#### Class 11th Chemistry - Environmental Chemistry Two Marks Questions - by Uma - Nagapattinam - Sep 26, 2019 - View & Read

• 1)

Define smog.

• 2)

Which is considered to be earth’s protective umbrella? Why?

• 3)

A person was using water supplied by corporation. Due to shortage of water he started using underground water. He felt laxative effect. What could be the cause?

• 4)

What is green chemistry?

• 5)

Why photochemical smog is called so?

#### Class 11th Chemistry - Haloalkanes and Haloarenes Two Marks Questions - by Uma - Nagapattinam - Sep 26, 2019 - View & Read

• 1)

Give reasons for polarity of C-X bond in halo alkane.

• 2)

Why is it necessary to avoid even traces of moisture during the use of Grignard reagent?

• 3)

What happens when acetyl chloride is treated with excess of CH3MgI?

• 4)

What happens when chloroform reacts with oxygen in the presence of sunlight?

• 5)

Mention any three methods of preparation of haloalkanes from alcohols.

#### Class 11th Chemistry - Hydrocarbons Two Marks Questions - by Uma - Nagapattinam - Sep 26, 2019 - View & Read

• 1)

How is propyne prepared from an alkyene dihalide?

• 2)

Describe the mechanism of Nitration of benzene.

• 3)

How does Huckel rule help to decide the aromatic character of a compound.

• 4)

Suggest the route for the preparation of the following from benzene.
1) 3 – chloro nitrobenzene
2) 4 – chlorotoluene
3) Bromo benzene
4) m - dinitro benzene.

• 5)

Write the chemical equations for combustion of propane.

#### Class 11th Chemistry - Basic concept of organic reactions Two Marks Questions - by Uma - Nagapattinam - Sep 26, 2019 - View & Read

• 1)

What are electrophiles and nucleophiles? Give suitable examples for each.

• 2)

Show the heterolysis of covalent bond by using curved arrow notation and complete the following equations.
Identify the nucleophile is each case.
(i) CH3 - Br + KOH →
(ii) CH3 - OCH3 + HI →

• 3)

Explain inductive effect with suitable example.

• 4)

Explain electromeric effect.

• 5)

Which of the two is expected to be more stable and why? ${ O }_{ 2 }NC{ H }_{ 2 }C{ H }_{ 2 }\overset { - }{ O }$ (or) $C{ H }_{ 3 }C{ H }_{ 2 }\overset { - }{ O }$

#### Class 11th Chemistry - Fundamentals of Organic Chemistry Two Marks Questions - by Uma - Nagapattinam - Sep 26, 2019 - View & Read

• 1)

Describe the classification of organic compounds based on their structure.

• 2)

Write a note on homologous series.

• 3)

Write the molecular and possible structural formula of the first four members of homologous series of carboxylic acids.

• 4)

Describe the reactions involved in the detection of nitrogen in an organic compound by Lassaigne method.

• 5)

Briefly explain geometrical isomerism in alkene by considering 2- butene as an example.

#### Class 11th Chemistry - Chemical Bonding Two Marks Questions - by Uma - Nagapattinam - Sep 26, 2019 - View & Read

• 1)

Draw the M.O diagram for oxygen molecule calculate its bond order and show that O2 is paramagnetic.

• 2)

Draw MO diagram of CO and calculate its bond order.

• 3)

What is dipole moment?

• 4)

Linear form of carbondioxide molecule has two polar bonds. yet the molecule has Zero dipolement why?

• 5)

Define bond energy.

#### Class 11th Chemistry - Solutions Two Marks Questions - by Uma - Nagapattinam - Sep 26, 2019 - View & Read

• 1)

A litre of sea water weighing about 1.05 kg contains 5 mg of dissolved oxygen (O2). Express the concentration of dissolved oxygen in ppm.

• 2)

Explain why the aquatic species are more comfortable in cold water during winter season rather than warm water during the summer.

• 3)

Define (i) molality (ii) Normality.

• 4)

State and explain Henry’s law

• 5)

State Raoult law and obtain expression for lowering of vapour pressure when nonvolatile solute is dissolved in solvent.

#### 11th Chemistry - Physical and Chemical Equilibrium Two Marks Questions - by Uma - Nagapattinam - Sep 26, 2019 - View & Read

• 1)

If there is no change in concentration, why is the equilibrium state considered dynamic?

• 2)

For a given reaction at a particular temperature, the equilibrium constant has constant value. Is the value of Q also constant? Explain.

• 3)

What the relation between KP and KC. Give one example for which KP is equal to KC.

• 4)

Consider the following reactions,
a) H2(g) + I2(g) ⇌ 2 HI
b) CaCO3 (s) ⇌ CaO (s) + CO2(g)
c) S(s) + 3F2 (g) ⇌ SF6 (g)
In each of the above reaction find out whether you have to increase (or) decrease the volume to increase the yield of the product.

• 5)

State law of mass action.

#### 11th Standard Chemistry - Solutions Model Question Paper - by Kumar - Pollachi - Sep 26, 2019 - View & Read

• 1)

The molality of a solution containing 1.8g of glucose dissolved in 250g of water is

• 2)

Which one of the following is incorrect for ideal solution?

• 3)

Osometic pressure (p) of a solution is given by the relatio

• 4)

Normality of 1.25M sulphuric acid is

• 5)

Phenol dimerises in benzene having van't Hoff factor 0.54. What is the degree of association?

#### 11th Standard Chemistry - Physical and Chemical Equilibrium Model Question Paper - by Kumar - Pollachi - Sep 26, 2019 - View & Read

• 1)

If Kb and Kf for a reversible reactions are 0.8 ×10–5 and 1.6 × 10–4 respectively, the value of the equilibrium constant is,

• 2)

The equilibrium constant for a reaction at room temperature is K1 and that at 700 K is K2. If K1 > K2, then

• 3)

An equilibrium constant of 3.2 × 10–6 for a reaction means, the equilibrium is

• 4)

Equimolar concentrations of H2 and I2 are heated to equilibrium in a 1 litre flask. What percentage of initial concentration of Hhas reacted at equilibrium if rate constant for both forward and reverse reactions are equal

• 5)

For the formation of Two moles of SO3(g) from SO2 and O2, the equilibrium constant is K1. The equilibrium constant for the dissociation of one mole of SO3 into SO2 and O2 is

#### 11th Chemistry - Thermodynamics Two Marks Questions - by Uma - Nagapattinam - Sep 21, 2019 - View & Read

• 1)

Define molar heat capacity. Give its unit

• 2)

Define the calorific value of food. What is the unit of calorific value?

• 3)

Define enthalpy of neutralization

• 4)

What is lattice energy?

• 5)

Give Kelvin statement of second law of thermodynamics.

#### 11th Chemistry - Gaseous State Two Marks Questions - by Uma - Nagapattinam - Sep 21, 2019 - View & Read

• 1)

Name two items that can serve as a model for Gay Lusaac' law and explain.

• 2)

Give the mathematical expression that relates gas volume and moles. Describe in words what the mathematical expression means.

• 3)

Can a Vanderwaals gas with a=0 be liquefied? explain.

• 4)

Suppose there is a tiny sticky area on the wall of a container of gas. Molecules hitting this area stick there permanently. Is the pressure greater or less than on the ordinary area of walls?

• 5)

Distinguish between diffusion and effusion.

#### 11th Chemistry - Alkali and Alkaline Earth Metals Two Marks Questions - by Uma - Nagapattinam - Sep 21, 2019 - View & Read

• 1)

Substantiate lithium fluoride has the lowest solubility among group one metal fluorides.

• 2)

Beryllium halides are Covalent whereas magnesium halides are ionic why?

• 3)

Write balanced chemical equation for the following processes
(a) heating calcium in oxygen
(b) heating calcium carbonate
(c) evaporating a solution of calcium hydrogen carbonate
(d) heating calcium oxide with carbon

• 4)

An alkali metal (x) forms a hydrated sulphate, X2SO4•10H2O. Is the metal more likely to be sodium (or) potassium.

• 5)

Why alkaline earth metals are harder than alkali metals.

#### 11th Chemistry - Term 1 Model Question Paper - by Kumar - Pollachi - Sep 21, 2019 - View & Read

• 1)

An element X has the following isotopic Composition 200X = 90%, 199X = 8% and 202X = 2% The Weighted average atomic mass of the element X is closet to

• 2)

The characteristic feature of orderly arrangement of molecules belongs to

• 3)

The maximum number of electrons in a sub shell is given by the expression

• 4)

The correct order of electron gain enthalpy with negative sign of F, Cl, Br and I having atomic number 9, 17, 35 and 53 respectively is

• 5)

The correct order of decreasing electronegativity values among the elements X, Y, Z and A with atomic numbers 4, 8, 7 and 12 respectively

#### 11th Chemistry Chapter 4 Hydrogen Two Marks Question - by Uma - Nagapattinam - Sep 19, 2019 - View & Read

• 1)

Explain why hydrogen is not placed with the halogen in the periodic table.

• 2)

Discuss the three types of Covalent hydrides.

• 3)

NH3 has exceptionally high melting point and boiling point as compared to those of the hydrides of the remaining element of group 15. Explain.

• 4)

What is para hydrogen?

• 5)

Write short notes on Deuterium.

#### 11th Chemistry - Periodic Classification Of Elements Two Marks Question - by Uma - Nagapattinam - Sep 19, 2019 - View & Read

• 1)

What are isoelectronic ions? Give examples.

• 2)

Magnesium loses electrons successively to form Mg+, Mg2+ and Mg3+ ions. Which step will have the highest ionisation energy and why?

• 3)

Define electro negativity.

• 4)

Give the general electronic configuration of lanthanides and actinides.

• 5)

Briefly outline anomalies of Mandeleev's periodic table

#### 11th Chemistry - Quantum Mechanical Model of Atom Two Marks Question - by Uma - Nagapattinam - Sep 19, 2019 - View & Read

• 1)

The stabilisation of a half filled d - orbital is more pronounced than that of the p-orbital why?

• 2)

How many orbitals are possible for n =4?

• 3)

How fast must a 54g tennis ball travel in order to have a de Broglie wavelength that is equal to that of a photon of green light 5400$\overset { 0 }{ A }$ ?

• 4)

Give the electronic configuration of Mn2+ and Cr3+

• 5)

What is the charge and mass of an electron?

#### 11th Chemistry Unit 1 Basic Concepts of Chemistry and Chemical Calculations Two Marks Question - by Uma - Nagapattinam - Sep 19, 2019 - View & Read

• 1)

What do you understand by the term mole

• 2)

Define equivalent mass

• 3)

What do you understand by the term oxidation number?

• 4)

Balance the following equations by ion electron method $Zn+{ NO }_{ 3 }^{ - }\longrightarrow { Zn }^{ 2+ }+No$

• 5)

Balance the following equations by oxidation number method - ${ K }Mno_{ 4 }+{ Na }_{ 2 }{ So }_{ 3 }\longrightarrow { MnO }_{ 2 }+{ Na }_{ 2 }{ So }_{ 4 }+KOH$

#### 11th Chemistry - Term 1 Five Mark Model Question Paper - by Uma - Nagapattinam - Sep 16, 2019 - View & Read

• 1)

The reaction between aluminum and ferric oxide can generate temperatures up to 3273 K and is used in welding metals. (Atomic mass of AC = 27 u atomic mass of O = 16 u )
2Al + Fe2O3 $\longrightarrow$ Al2O3 + 2Fe;  If in this process, 324 g of aluminum is allowed to react with 1.12 kg of ferric oxide
i) Calculate the mass of Al2O3 formed
ii) How much of the excess reagent is left at the end of the reaction?

• 2)

Calculate the energy required for the process.
${ He }_{ (g) }^{ + }\longrightarrow { He }_{ (g) }^{ 3+ }+{ e }^{ - }$
The ionisation energy for the H atom in its ground state is -13..6 ev atom-1

• 3)

Suppose that the uncertainty in determining the position of an electron in an orbit is 0.6 $\mathring{A}$ . What is the uncertainty in its momentum

• 4)

Explain the diagonal relationship.

• 5)

What is screening effect? Briefly give the basis for pauling's scale of electronegativity.

#### 11th Chemistry Quarterly Model Question Paper - by Uma - Nagapattinam - Sep 13, 2019 - View & Read

• 1)

An element X has the following isotopic Composition 200X = 90%, 199X = 8% and 202X = 2% The Weighted average atomic mass of the element X is closet to

• 2)

1 g of an impure sample of magnesium carbonate (containing no thermally decomposable impurities) on complete thermal decomposition gave 0.44 g of carbon dioxide gas. The percentage of impurity in the sample is ______________

• 3)

Hot concentrated sulphuric acid is a moderately strong oxidizing agent. Which of the following reactions does not show oxidising behaviour?

• 4)

The oxidation number of oxygen in O2 is _______________

• 5)

Which one of the following represents 180g of water?

#### 11th Chemistry - Environmental Chemistry Book Back Questions - by Uma - Nagapattinam - Sep 07, 2019 - View & Read

• 1)

The gaseous envelope around the earth is known as atmosphere. The region lying between an altitudes of 11-50 km is __________

• 2)

Photo chemical smog formed in congested metropolitan cities mainly consists of

• 3)

Ozone depletion will cause

• 4)

Release of oxides of nitrogen and hydrocarbons into the atmosphere by motor vehicles is prevented by using __________

• 5)

Biochemical oxygen Demand value less than 5 ppm indicates a water sample to be

#### 11th Chemistry Chapter 14 Haloalkanes and Haloarenes Book Back Questions - by Uma - Nagapattinam - Sep 07, 2019 - View & Read

• 1)

The IUPAC name of  is

• 2)

Of the following compounds, which has the highest boiling point?

• 3)

What should be the correct IUPAC name of diethyl chloromethane?

• 4)

Benzene reacts with Cl2 in the presence of FeCl3 and in absence of sunlight to form

• 5)

Which of the following reagent is helpful to differentiate ethylene dichloride and ethylidene chloride?

#### 11th Chemistry Chapter 13 Hydrocarbons Book Back Questions - by Uma - Nagapattinam - Sep 07, 2019 - View & Read

• 1)

The correct statement regarding the comparison of staggered and eclipsed conformations of ethane is

• 2)

An alkyl bromide (A) reacts with sodium in ether to form 4, 5– diethyloctane, the compound (A) is

• 3)

The C – H bond and C – C bond in ethane are formed by which of the following types of overlap

• 4)

The general formula for cyclo alkanes

• 5)

The compound that will react most readily with gaseous bromine has the formula

#### 11th Chemistry Unit 12 Basic concept of organic reactions Book Back Questions - by Uma - Nagapattinam - Sep 07, 2019 - View & Read

• 1)

For the following reactions
(A) CH3CH2CH2Br + KOH → CH2 = CH2 + KBr + H2O
(B) (CH3)3CBr + KOH → (CH3)3 COH + KBr
(C)
Which of the following statement is correct?

• 2)

What is the hybridisation state of benzyl carbonium ion?

• 3)

Decreasing order of nucleophilicity is

• 4)

Which of the following species is not electrophilic in nature?

• 5)

Homolytic fission of covalent bond leads to the formation of

#### 11th Chemistry Unit 11 Fundamentals of Organic Chemistry Book Back Questions - by Uma - Nagapattinam - Sep 07, 2019 - View & Read

• 1)

Select the molecule which has only one $\pi$ bond.

• 2)

In the hydrocarbo $\overset { 7 }{ { CH }_{ 3 } } -\overset { 6 }{ { CH }_{ 2 } } -\overset { 5 }{ CH } =\overset { 4 }{ CH } -\overset { 3 }{ { CH }_{ 2 } } -\overset { 2 }{ CH } =\overset { 1 }{ CH }$ the state of hybridisation of carbon 1,2,3,4 and 7 are in the following sequence.

• 3)

Which one of the following names does not fit a real name?

• 4)

IUPAC name of ${ CH }_{ 3 }-\overset { \underset { | }{ H } }{ \underset { \overset { | }{ { C }_{ 2 }{ H }_{ 5 } } }{ C } } -\overset { \underset { | }{ { C }_{ 4 }{ H }_{ 9 } } }{ \underset { \overset { | }{ { CH }_{ 3 } } }{ C } } -{ CH }_{ 3 }$ is

• 5)

The IUPAC name of the compound  is

#### 11th Chemistry Unit 10 Chemical bonding Book Back Questions - by Uma - Nagapattinam - Sep 06, 2019 - View & Read

• 1)

In which of the following Compounds does the central atom obey the octet rule?

• 2)

In the molecule O= C = OB, the formal charge on OA, C and OB are respectively.

• 3)

The ratio of number of sigma (σ) and pi (л) bonds in 2- butynal is

• 4)

Assertion: Oxygen molecule is paramagnetic.
Reason: It has two unpaired electron in its bonding molecular orbital.

• 5)

In ClF3, NF3 and BF3 molecules the chlorine, nitrogen and boron atoms are

#### 11th Chemistry Unit 9 Solutions Book Back Questions - by Uma - Nagapattinam - Sep 06, 2019 - View & Read

• 1)

The Henry's law constant for the solubility of Nitrogen gas in water at 350 K is 8 × 104 atm. The mole fraction of nitrogen in air is 0.5. The number of moles of Nitrogen from air dissolved in 10 moles of water at 350K and 4 atm pressure is

• 2)

Which one of the following is incorrect for ideal solution?

• 3)

P1 and P2 are the vapour pressures of pure liquid components, 1 and 2 respectively of an ideal binary solution if x1 represents the mole fraction of component 1, the total pressure of the solution formed by 1 and 2 will be

• 4)

Which one of the following binary liquid mixtures exhibits positive deviation from Raoults law?

• 5)

At 100C the vapour pressure of a solution containing 6.5g a solute in 100g water is 732mm. If Kb = 0.52, the boiling point of this solution will be

#### 11th Chemistry Unit 8 Physical and Chemical Equilibrium Book Back Questions - by Uma - Nagapattinam - Sep 06, 2019 - View & Read

• 1)

If Kb and Kf for a reversible reactions are 0.8 ×10–5 and 1.6 × 10–4 respectively, the value of the equilibrium constant is,

• 2)

Solubility of carbon dioxide gas in cold water can be increased by

• 3)

In the equilibrium,
2A(g) ⇌ 2B(g) + C2(g)
the equilibrium concentrations of A, B and C2 at 400 K are 1 × 10–4 M, 2.0 × 10–3 M, 1.5 × 10–4 M respectively. The value of KC for the equilibrium at 400 K is

• 4)

An equilibrium constant of 3.2 × 10–6 for a reaction means, the equilibrium is

• 5)

In which of the following equilibrium, KP and KC are not equal?

#### 11th Standard Chemistry - Thermodynamics Book Back Questions - by Uma - Nagapattinam - Sep 04, 2019 - View & Read

• 1)

The amount of heat exchanged with surrounding at constant temperature pressure is given by the quantity

• 2)

In an adiabatic process, which of the following is true?

• 3)

An ideal gas expands from the volume of 1 x 10-3 m3 to 1 x 10-2 m3 at 300 K against a constant pressure at 1 x 105 Nm-2. The work done is

• 4)

The heat of formation of CO and CO2 are - 26.4 kcal and - 94 kcal, respectively. Heat of combustion of carbon monoxide will be

• 5)

The enthalpies of formation of Al2O3 and Cr2Oare -1596 kJ and -1134 kJ, respectively. ΔH for the reaction 2AI + Cr2O3 ⟶ 2Cr + Al2O3 is

#### 11th Standard Chemistry - Gaseous State Book Back Questions - by Uma - Nagapattinam - Sep 04, 2019 - View & Read

• 1)

Gases deviate from ideal behavior at high pressure. Which of the following statement(s) is correct for non-ideality?

• 2)

The temperatures at which real gases obey the ideal gas laws over a wide range of pressure is called

• 3)

The value of the gas constant R is

• 4)

Compressibility factor for CO2 at 400 K and 71.0 bar is 0.8697. The molar volume of CO2 under these conditions is

• 5)

The variation of volume V, with temperature T, keeping pressure constant is called the coefficient of thermal expansion ie $\alpha =\frac { 1 }{ V } { \left( \frac { \partial V }{ \partial T } \right) }_{ P }$ . For an ideal gas a is equal to

#### 11th Standard Chemistry - Alkali and Alkaline Earth Metals Book Back Questions - by Uma - Nagapattinam - Sep 03, 2019 - View & Read

• 1)

For alkali metals, which one of the following trends is incorrect?

• 2)

RbO2 is

• 3)

Lithium shows diagonal relationship with

• 4)

In which process, fused sodium hydroxide is electro lysed for extraction of sodium

• 5)

The product obtained as a result of a reaction of nitrogen with CaC2 is

#### 11th Standard Chemistry - Periodic Classification Of Elements Book Back Questions - by Uma - Nagapattinam - Sep 02, 2019 - View & Read

• 1)

What would be the IUPAC name for an element with atomic number 222?

• 2)

Which of the following elements will have the highest electro negativity

• 3)

In the third period the first ionization potential is of the order.

• 4)

Which one of the following arrangements represent the correct order of least negative to most negative electron gain enthalpy

• 5)

The correct order of electron gain enthalpy with negative sign of F, Cl, Br and I having atomic number 9, 17, 35 and 53 respectively is

#### 11th Standard Chemistry - Hydrogen Book Back Questions - by Uma - Nagapattinam - Sep 02, 2019 - View & Read

• 1)

Which of the following statements about hydrogen is incorrect?

• 2)

Tritium nucleus contains

• 3)

The hardness of water can be determined by volumetrically using the reagent

• 4)

Zeolite used to soften hardness of water is hydrated

• 5)

For decolorisation of 1 mole of acidified KMnO4, the moles of H2O2 required is

#### 11th Standard Chemistry - Quantum Mechanical Model of Atom Book Back Questions - by Uma - Nagapattinam - Aug 31, 2019 - View & Read

• 1)

The energies E1and E2 of two radiations are 25 eV and 50 eV respectively. The relation between their wavelengths ie $\lambda$1 and$\lambda$2 will be

• 2)

Two electrons occupying the same orbital are distinguished by

• 3)

For d-electron, the orbital angular momentum is

• 4)

What is the maximum numbers of electrons that can be associated with the following set of quantum numbers? n = 3, I = 1 and m =-1

• 5)

If n = 6, the correct sequence for filling of electrons will be,

#### 11th Chemistry Unit 1 Basic Concepts of Chemistry and Chemical Calculations Book Back Questions - by Uma - Nagapattinam - Aug 30, 2019 - View & Read

• 1)

The mass of a gas that occupies a volume of 612.5 ml at room temperature and pressure (250 c and 1 atm pressure) is 1.1g. The molar mass of the gas is

• 2)

Which of the following compound(s) has /have a percentage of carbon same as that in ethylene (C2H4)

• 3)

Which of the following is/are true with respect to carbon -12

• 4)

Which one of the following is used as a standard for atomic mass.

• 5)

The equivalent mass of potassium permanganate in alkaline medium is:
MnO4- + 2H2O + 3e-$\rightarrow$ MnO2 + 4OH-

#### 11th Standard Chemistry - Physical and Chemical Equilibrium One Mark Question and Answer - by Uma - Nagapattinam - Aug 29, 2019 - View & Read

• 1)

If Kb and Kf for a reversible reactions are 0.8 ×10–5 and 1.6 × 10–4 respectively, the value of the equilibrium constant is,

• 2)

The equilibrium constant for a reaction at room temperature is K1 and that at 700 K is K2. If K1 > K2, then

• 3)

Solubility of carbon dioxide gas in cold water can be increased by

• 4)

For which of the following reaction, the degree 0 dissociation (a) and equilibrium constant (Kp) are related as ${ K }_{ p }=\cfrac { 4\alpha ^{ 2 }P }{ \left( 1-{ \alpha }^{ }2 \right) } ?$

• 5)

In which of the following does the reaction go almost to completion?

#### 11th Standard Chemistry - Solutions One Mark Question with Answer Key - by Uma - Nagapattinam - Aug 29, 2019 - View & Read

• 1)

The molality of a solution containing 1.8g of glucose dissolved in 250g of water is

• 2)

Which of the following concentration terms is/are independent of temperature

• 3)

The Henry's law constant for the solubility of Nitrogen gas in water at 350 K is 8 × 104 atm. The mole fraction of nitrogen in air is 0.5. The number of moles of Nitrogen from air dissolved in 10 moles of water at 350K and 4 atm pressure is

• 4)

Which one of the following is incorrect for ideal solution?

• 5)

The blocking of capillaires due to sudden release of bubbles of N2 gas in blood is known as

#### 11th Standard Chemistry - Thermodynamics One Mark Question with Answer - by Uma - Nagapattinam - Aug 28, 2019 - View & Read

• 1)

The amount of heat exchanged with surrounding at constant temperature pressure is given by the quantity

• 2)

All the naturally occurring processes proceed spontaneously in a direction which leads to

• 3)

In an adiabatic process, which of the following is true?

• 4)

All naturally occurring processes are ----- process

• 5)

The process in which no heat can flow into or out of the system are called ----- process.

#### 11th Chemistry Chapter 6 Gaseous State One Mark Question with Answer Key - by Uma - Nagapattinam - Aug 27, 2019 - View & Read

• 1)

Gases deviate from ideal behavior at high pressure. Which of the following statement(s) is correct for non-ideality?

• 2)

Which of the following is the correct expression for the equation of state of van der Waals gas?

• 3)

The temperatures at which real gases obey the ideal gas laws over a wide range of pressure is called

• 4)

A bottle of ammonia and a bottle of HCI connected through a long tube are opened simultaneously at both ends. The white ammonium chloride ring first formed will be

• 5)

At identical temperature and pressure, the rate of diffusion of hydrogen gas is 3$\sqrt { 3 }$ times that of a hydrocarbon having molecular formula CnH2n-2. What is the value of n ?

#### 11th Chemistry Unit 5 Alkali and Alkaline Earth Metals One Mark Question and Answer - by Uma - Nagapattinam - Aug 27, 2019 - View & Read

• 1)

For alkali metals, which one of the following trends is incorrect?

• 2)

Which of the following statements is in correct?

• 3)

Which of the following compounds will not evolve H2 gas on reaction with alkali metals?

• 4)

The radioactive element of group 1 is ______

• 5)

Half life of francium is _______

#### 11th Chemistry Chapter 4 Hydrogen One Mark Question with Answer - by Uma - Nagapattinam - Aug 27, 2019 - View & Read

• 1)

Water gas is

• 2)

Tritium nucleus contains

• 3)

Non-stoichiometric hydrides are formed by

• 4)

If a body of a fish contains 1.2 g hydrogen in its total body mass, if all the hydrogen is replaced with deuterium then the increase in body weight of the fish will be

• 5)

The hardness of water can be determined by volumetrically using the reagent

#### 11th Standard Chemistry Periodic Classification Of Elements - One Mark Question with Answer - by Uma - Nagapattinam - Aug 26, 2019 - View & Read

• 1)

What would be the IUPAC name for an element with atomic number 222?

• 2)

The group of elements in which the differentiating electron enters the anti penultimate shell of atoms are called

• 3)

Period of an element is represented by _____ quantum number

• 4)

The first list of 23 chemical elements was published by _____ in the year 1789.

• 5)

Law of triad was unable to explain for the element

#### 11th Business Maths - Quantum Mechanical Model of Atom One Mark Question Paper - by Uma - Nagapattinam - Aug 24, 2019 - View & Read

• 1)

The energy of light of wavelength 45 nm is

• 2)

The energies E1and E2 of two radiations are 25 eV and 50 eV respectively. The relation between their wavelengths ie $\lambda$1 and$\lambda$2 will be

• 3)

Splitting of spectral lines in an electric field is called

• 4)

The electronic configuration of Eu (Atomic no. 63) Gd (Atomic no. 64) and Tb (Atomic no. 65) are

• 5)

Which of the following pairs of d-orbitals will have electron density along the axes ?

#### 11th Chemistry Basic Concepts of Chemistry and Chemical Calculations One Mark Question Paper - by Uma - Nagapattinam - Aug 23, 2019 - View & Read

• 1)

40 ml of methane is completely burnt using 80 ml of oxygen at room temperature The volume of gas left. after cooling to room temperature is

• 2)

The number of water molecules in a drop of water weighing 0.018 g is

• 3)

Fe2 + $\longrightarrow$ Fe3+ + e- is a ________ reaction.

• 4)

The oxidation number of hydrogen in LiH is _____________

• 5)

Which one of the following represents 180g of water?

#### 11th Chemistry Thermodynamics Model Question Paper - by Uma - Nagapattinam - Aug 20, 2019 - View & Read

• 1)

All the naturally occurring processes proceed spontaneously in a direction which leads to

• 2)

Heat of combustion is always

• 3)

Change in internal energy, when 4 kJ of work is done on the system and 1 kJ of heat is given out by the system is

• 4)

The bond dissociation energy of methane and ethane are 360 kJ mol-1 and 620 kJ mol-1 respectively. Then, the bond dissociation energy of C-C bond is

• 5)

Which among the following is not an extensive property?

#### 11th Chemistry Unit 6 Alkali and Alkaline Earth Metals Model Question Paper - by Uma - Nagapattinam - Aug 19, 2019 - View & Read

• 1)

Which of the following compounds will not evolve H2 gas on reaction with alkali metals?

• 2)

Lithium shows diagonal relationship with

• 3)

Which is the correct sequence of solubility of  carbonates of alkaline earth metals?

• 4)

The hydration enthalpies of alkali metal ions decreases in ______ order.

• 5)

The reducing power of a metal depends on various factors. Suggest the factor. which makes Li, the strongest reducing agent in aqueous solution

#### 11th Chemistry Unit 6 Gaseous State Model Question Paper - by Uma - Nagapattinam - Aug 12, 2019 - View & Read

• 1)

Rate of diffusion of a gas is

• 2)

The value of universal gas constant depends upon

• 3)

Compressibility factor for CO2 at 400 K and 71.0 bar is 0.8697. The molar volume of CO2 under these conditions is

• 4)

Pressure is _____________

• 5)

The hydrogen balloon was invented by ______________

#### 11th Chemistry First Mid Term Model Question Paper - by Uma - Nagapattinam - Aug 01, 2019 - View & Read

• 1)

40 ml of methane is completely burnt using 80 ml of oxygen at room temperature The volume of gas left. after cooling to room temperature is

• 2)

Hot concentrated sulphuric acid is a moderately strong oxidizing agent. Which of the following reactions does not show oxidising behaviour?

• 3)

Which of the following compound(s) has /have a percentage of carbon same as that in ethylene (C2H4)

• 4)

Molecular mass =

• 5)

Assertion: Helium has the highest value of ionization energy among all the elements known
Reason: Helium has the highest value of electron affinity among all the elements known

#### 11th Chemistry Chapter 4 Hydrogen Model Question Paper - by Uma - Nagapattinam - Jul 31, 2019 - View & Read

• 1)

Which of the following statements about hydrogen is incorrect?

• 2)

Non-stoichiometric hydrides are formed by

• 3)

If a body of a fish contains 1.2 g hydrogen in its total body mass, if all the hydrogen is replaced with deuterium then the increase in body weight of the fish will be

• 4)

The number of neutrons in  hydrogen atom is ___________.

• 5)

_____________ is known as heavy hydrogen.

#### 11th Standard Chemistry Chapter 3 Periodic Classification Of Elements Important Question Paper - by Uma - Nagapattinam - Jul 26, 2019 - View & Read

• 1)

What would be the IUPAC name for an element with atomic number 222?

• 2)

The electronic configuration of the elements A and Bare 1s2, 2s 2,2p6,3s2 and 1s2, 2s2,2p5 respectively. The formula of the ionic compound that can be formed between these elements is

• 3)

The first list of 23 chemical elements was published by _____ in the year 1789.

• 4)

Which of the following is Dobereiner's triad?

• 5)

What would be the formula of the compound formed by A and B, where A has the valence 3 and B has the valence 3?

#### Plus 1 Chemistry Chapter 2 Quantum Mechanical Model of Atom Important Question Paper - by Uma - Nagapattinam - Jul 24, 2019 - View & Read

• 1)

The energy of light of wavelength 45 nm is

• 2)

The energies E1and E2 of two radiations are 25 eV and 50 eV respectively. The relation between their wavelengths ie $\lambda$1 and$\lambda$2 will be

• 3)

Splitting of spectral lines in an electric field is called

• 4)

The electronic configuration of Eu (Atomic no. 63) Gd (Atomic no. 64) and Tb (Atomic no. 65) are

• 5)

Which of the following pairs of d-orbitals will have electron density along the axes ?

#### 11th Chemistry - Unit 1 Question Paper - by Uma - Nagapattinam - Jul 18, 2019 - View & Read

• 1)

40 ml of methane is completely burnt using 80 ml of oxygen at room temperature The volume of gas left. after cooling to room temperature is

• 2)

An element X has the following isotopic Composition 200X = 90%, 199X = 8% and 202X = 2% The Weighted average atomic mass of the element X is closet to

• 3)

Assertion: Two mole of glucose contains 12.044 x 1023 molecules of glucose
Reason: Total number of entities present in one mole of any substance is equal to 6.02 x 1022

• 4)

The oxidation number of hydrogen in LiH is _____________

• 5)

The oxidation number of Cr in Cr2O72- __________ is

#### creative one mark questions for english medium in eleventh standard chemistry - by Karthi - May 03, 2019 - View & Read

• 1)

Match the List-I and List-II using the correct code given below the list.

 List-I List-II A. Hydrogenation of unsaturated vegetable oils 1. Rocket fuel B. Calcium hydride 2. Welding of metals C. Liquid hydrogen 3. Desiccant D. Atomic hydrogen 4. Margarine
• 2)

Which of the following causes temporary hardness of water?

• 3)

Which of the following can oxidise Hydrogen peroxide?

• 4)

Which of the following process is important in food industry?

• 5)

Which of the following is used as desiccants to remove moisture from organic solvents?

#### Important one marks questions in plus one english medium chemistry chapter one Hydrogen - by Karthi - May 03, 2019 - View & Read

• 1)

HF has ______ hydrogen bond.

• 2)

Acetic acid exist as a __________

• 3)

What is the dihedral angle of H2O2 in gas and solid phase?

• 4)

H2O2 acts as

• 5)

The reaction H2O2 ➝ H2O+O2 represents,

#### eleventh standard chemistry chapter one Hydrogen one mark questions english medium - by Karthi - May 03, 2019 - View & Read

• 1)

The most abundant element in the universe is _________.

• 2)

The number of neutrons in  hydrogen atom is ___________.

• 3)

_____________ is known as heavy hydrogen.

• 4)

Deuterium consist of _____________

• 5)

The radioactive isotope of hydrogen is __________

#### Eleventh standard Model question paper for chapters 1, 2 & 3 English medium - by Karthi - Apr 29, 2019 - View & Read

• 1)

40 ml of methane is completely burnt using 80 ml of oxygen at room temperature The volume of gas left. after cooling to room temperature is

• 2)

Fe2 + $\longrightarrow$ Fe3+ + e- is a ________ reaction.

• 3)

Which one of the following represents 180g of water?

• 4)

Among the three metals, zinc, copper and silver, the electron releasing tendency decreases in the following order.

• 5)

Which of the following statement(s) is/are not true about the following decomposition reaction.
2KClO3 $\longrightarrow$ 2KCl + 3O2
(i) Potassium is undergoing oxidation
(ii) Chlorine is undergoing oxidation
(iii) Oxygen is reduced
(iv) None of the species are undergoing oxidation and reduction.

#### Chapter - 3 Periodic Classification Of Elements most expected five mark questions English medium eleventh standard - by Karthi - Apr 29, 2019 - View & Read

• 1)

Using Slater's rule calculate the effective nuclear charge on a 3p electron in aluminium and chlorine. Explain how these results relate to the atomic radii of the two atoms.

• 2)

(a) State Mendeleev's periodic law.
(b) Describe about the merits of Mendeleev's periodic table.

• 3)

Explain about the anomalies of Mendeleev's periodic table.

• 4)

Explain about the structural features of Moseley's long form of periodic table.

• 5)

Explain the merits of Moseley's long form of periodic table.

#### Eleventh standard Public exam five mark questions Periodic Classification Of Elements chapter - 3 - by Karthi - Apr 29, 2019 - View & Read

• 1)

Give the structural features of modern periodic law.

• 2)

Mention Anomalies of Mendeleev's periodic table.

• 3)

How do you classify of elements into blocks? Give their electronic configuration.

• 4)

Give the characteristics of p-block elements.

• 5)

Give any five characteristic properties of inner transition elements.

#### Eleventh standard English medium Important three mark questions Periodic Classification Of Elements - II - by Karthi - Apr 29, 2019 - View & Read

• 1)

Explain how electronegativity values are used to predict the nature of the bond between two atoms between A and B

• 2)

Which of the following species will have the largest and smallest size?

• 3)

Given the formula of the species that will be isoelectronic with the following atoms or ions
(i) Ar (ii) F- (iii) K+ (iv) S-2

• 4)

Which of the following pairs of elements would you expect to have higher ionisation energy?(i) CI or F, (ii) S or CI, (iii) Na or Ne, (iv)Ar or Kr.

• 5)

(i) Why has chlorine higher electron affinity than fluorine?
(ii) Why has nitrogen has higher 1st ionisation potential than oxygen atom?
(iii) Why has magnesium higher I.E. than aluminium atom?

#### Periodic Classification Of Elements chapter - 3 creative three mark questions English medium for +1 - by Karthi - Apr 29, 2019 - View & Read

• 1)

Write the name and deduce the atomic number of the following element
i. The second alkali metal
ii. The fourth noble gas
iii. The third halogen
iv. The first transition element

• 2)

Name the third chalcogen and fifth noble gas

• 3)

Lanthanoids and actinoids are placed in separate rows at the bottom of the periodic table. Explain.

• 4)

Helium has a electronic configuration of 1s2 but placed in p block in group 18. Justify.

• 5)

Describe in brief Lothar Meyer's classification of elements.

#### Board exam two mark questions in Periodic Classification Of Elements eleventh standard English medium - by Karthi - Apr 29, 2019 - View & Read

• 1)

The ionisation energy is directly related to metallic character. Explain the variation of metallic character along the period and in the group.

• 2)

Explain the nature of oxides formed by metals and non metals.

• 3)

How does the basic and acidic nature of oxides vary along a period and in group?.

• 4)

How is ionisation energy related to the metallic character? How does the basic nature of hydroxides of alkaline earth metals very down the group?

• 5)

Account for the difference in size of Na +(95 pm) and Mg+2(65pm) both of which have the same noble gas configuration

#### Mostly asked +1 chapter - 3 Periodic Classification Of Elements two mark questions - by Karthi - Apr 29, 2019 - View & Read

• 1)

How does atomic and ionic radii vary across the group and period.

• 2)

Mandeleev predicted that elements with atomic weights 72.68 and 70 in group IV and their properties. Name the elements that were discovered later and have properties predicted by Mandeleev.

• 3)

Give Mosley's relationship.

• 4)

Briefly outline anomalies of Mandeleev's periodic table

• 5)

Explain how will you find the atomic number of an element from the frequency of X-rays emitted by an element.

#### English medium Periodic Classification Of Elements frequently asked one mark questions eleventh standard - by Karthi - Apr 29, 2019 - View & Read

• 1)

The first ionisation potential ofNa is 5.1 eY. The value of electron gain enthalpy is

• 2)

Electronegativity of the following elements increases in the order

• 3)

Consider the following elements: B, AI, Mg and K.

• 4)

(1) inverse proportion to the effective nuclear charge
(2) inverse proportion to the square of the effective nuclear charge.
(3) direct proportion to the screening effect.
(4) direct proportion to the square of screening effect

• 5)

The chemical symbol of carbon and cobalt are______

#### Eleventh standard Public one mark questions Periodic Classification Of Elements English medium - by Karthi - Apr 29, 2019 - View & Read

• 1)

Match the list I with List II and select the correct answer using. the code given below the lists.

 List I List II A A halogen 1 Cesium B An alkali metal 2 Germanium C A chalcogen 3 Iodine D A metalloid 4 Selenium
• 2)

Period of an element is represented by _____ quantum number

• 3)

The first list of 23 chemical elements was published by _____ in the year 1789.

• 4)

Match the list I with List II and select the correct answer using. the code given below the lists.

 List I List II A Chancourtois 1 Addition of synthetic elements B Rang 2 Families and periods Long form C Glenn Seaborg 3 Modem periodic law D Moseley 4 First periodic law
• 5)

Which of the following statement (s) about the Modern Periodic Table is are incorrect
i. The elements in the Modern Periodic Table are arranged on the basis of their decreasing atomic number.
ii. The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic masses.
iii. Isotopes are placed in adjoining group (s) in the Periodic Table.
iv. The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic number.

#### Chapter - 2 Quantum Mechanical Model of Atom important five mark questions English medium eleventh standard - by Karthi - Apr 29, 2019 - View & Read

• 1)

If an electron is moving with a velocity 600 ms-1 which is accurate upto 0.005%, then calculate the uncertainty in its position. (h = 6.63 x 10-34 Js. mass of electron = 9.1 x 10-31 kg)

• 2)

Light of wavelength 12818 $\overset { o }{ A }$ is emitted when the electron of a hydrogen atom drops from 5th to 3rd orbit. Find the wavelength of a photon emitted when the electron falls from 3rd to 2nd orbit.

• 3)

Calculate the de Broglie wavelength of an electron that has been accelerated from rest through a potential difference of 1 keV.

• 4)

Calculate the uncertainty in the position of an electron, if the uncertainty in its velocity is 5.7 x 105 ms-1.

• 5)

Calculate the total number of angular nodes and radial nodes present in 3d and 4f orbitals.

#### Eleventh standard Centum five mark questions Quantum Mechanical Model of Atom English medium - by Karthi - Apr 29, 2019 - View & Read

• 1)

Enlist the postulates of Bohr's atom model.

• 2)

By applying Bohr's postulates, arrive at the radius of nth orbit for hydrogen like atom

• 3)

Write a note on limitations of Bohr's atom model.

• 4)

Derive an equation for the wavelength of a matter wave.

• 5)

List out the important features of quantum mechanical model of atom

#### English medium chapter - 2 Quantum Mechanical Model of Atom frequently asked three mark questions - III - by Karthi - Apr 27, 2019 - View & Read

• 1)

Which has the stable electronic configuration? Ni2+ or Fe3+.

• 2)

How many electrons in an atom may have the following quantum numbers?
(a) n = 4; ms = -1\2 (b) n = 3, 1=0.

• 3)

Show that the circumference of the Bohr orbit for the hydrogen atom is an integral multiple of the de Broglie wavelength associated with the electron revolving around the orbit.

• 4)

An ion with mass number 56 contains 3 units of positive charge and 30.4% more neutrons than electrons. Assign symbol to the ion.

• 5)

The uncertainty in the position of a moving bullet of mass 10 g is 10-5 m. Calculate the uncertainty in its velocity?

#### Chapter - 2 Creative three mark questions Quantum Mechanical Model of Atom - II for english medium - by Karthi - Apr 27, 2019 - View & Read

• 1)

Explain the shapes of p orbitals

• 2)

Discuss the shapes of d orbitals.

• 3)

Write a note on the shape of f orbitals

• 4)

(i) What is common between dxy and dx2-y2 orbitals?
(ii) What is the difference between them?
(iii) What is the angle between the lobes of the above two orbitals?

• 5)

If the K.E of electron is 2.5 $\times$10-24 J, then calculate its de-Broglie wavelength.

#### English medium Most asked three mark questions Quantum Mechanical Model of Atom chapter - 2 - by Karthi - Apr 27, 2019 - View & Read

• 1)

An electron a proton which one will have a higher velocity to produce matter waves of the same wavelength? Explain it

• 2)

Explain why the uncertainty principle is significant only for the motion of sub-atomic particles but is negligible for the macroscopic objects?

• 3)

What are quantum numbers?

• 4)

What is the maximum number of electrons that can be accommodated in a shell?

• 5)

What is meant by nodal surface or node?

#### Chapter - 2 Quantum Mechanical Model of Atom english medium Public two mark questions - II - by Karthi - Apr 27, 2019 - View & Read

• 1)

How many unpaired electrons are present in the ground state of
(i) Cr3+ (Z = 24) (ii) Ne (Z = 10)

• 2)

What is meant by electronic configuration? Write the electronic configuration of N (Z = 7).

• 3)

Which is the actual configuration of Cr ( Z = 24). Why?

• 4)

What is the actual configuration of copper (Z = 29)? Explain about its stability.

• 5)

Write a note about J.J. Thomson's atomic model.

#### English medium Most important two mark questions in chapter - 2 Quantum Mechanical Model of Atom - by Karthi - Apr 27, 2019 - View & Read

• 1)

Write a note on Thomson's plum pudding model of an atom.

• 2)

What did Rutherford's alpha ray scattering experiment prove

• 3)

What are the defects of Rutherford's model?

• 4)

What is the charge and mass of an electron?

• 5)

What is the difference between atomic mass and mass number?

#### Chapter - 2 Quantum Mechanical Model of Atom English medium Public one mark questions - III - by Karthi - Apr 27, 2019 - View & Read

• 1)

The Bohr's radius of Li2+ of 2nd orbit is ________________

• 2)

The formula used to calculate the Bohr's radius is_________________

• 3)

Who proposed the dual nature of light to all forms of matter?

• 4)

de Broglie equation is________________

• 5)

The crystal used in Davison and Germer experiment is____________________

#### English medium Quantum Mechanical Model of Atom Creative one mark questions with answer key - II - by Karthi - Apr 27, 2019 - View & Read

• 1)

Schrodinger wave equation is applied to determine______.

• 2)

Bohr's equation for energy of an election in a hydrogen atom is given as______

• 3)

The effect which represents the splitting of spectral lines by external electric field is______

• 4)

According to Bohr's theory angular momentum of an electron in 6th orbit is

• 5)

When an electron jumps from lower orbit to higher orbit

#### Important one mark questions Quantum Mechanical Model of Atom English medium - by Karthi - Apr 27, 2019 - View & Read

• 1)

The oxidation state of a element in its uncombined state is

• 2)

Fe2 + $\longrightarrow$ Fe3+ + e- is a ________ reaction.

• 3)

Assertion: Fluorine has an oxidation state of - 1in all its compounds.
Reason: Fluorine is the most electronegative element of the periodic table.

• 4)

The oxidation number of oxygen in O2 is _______________

• 5)

The oxidation number of hydrogen in LiH is _____________

#### Frequently asked five mark questions Basic Concepts of Chemistry and Chemical Calculations - by Karthi - Apr 27, 2019 - View & Read

• 1)

Balance the following equation by ion-electron method In acidic medium.
$Mn{O}_4^-+I^-\rightarrow MnO_2+I_2$

• 2)

Balance the following equation by ion-electron method In acidic medium.
$Mn{O}_4^-+Fe^{2+}\rightarrow Mn^{2+}+Fe^{3+}$

• 3)

Balance the following equation by ion-electron method In acidic medium.
$Cr{(OH)}_4^-+H_2O_2\rightarrow Cr{O}_4^{2-}$

• 4)

(a) Define equivalent mass of an oxidising agent.
(b) How would you calculate the equivalent mass of potassium permanganate?

• 5)

(a) Define equivalent mass of an reducing agent.
(b) How would you determine the equivalent mass of Ferrous sulphate?

#### English medium Model question paper for chapter - 1 Basic Concepts of Chemistry and Chemical Calculations - by Karthi - Apr 27, 2019 - View & Read

• 1)

Rusting of iron articles is an example of ___________ reaction

• 2)

Identify the correct statement(s) with respect to the following reaction :
Zn + 2HCl $\longrightarrow$ ZnCl2 + H2
(i) Zinc is acting as an oxidant
(ii) Chlorine is acting as a reductant
(iii) Hydrogen is not acting as an oxidant
(iv) Zn is acting as a reductant

• 3)

Match the list-I with list-II and select the correct answer using the code given below the lists.

 List-I List-II A Cr2O72- 1 +5 B MnO4- 2 +6 C VO3- 3 +3 D FeF63+ 4 +7
• 4)

Match the items in column list-I with relevant items in list-II.

 List-I List-II A Ions having positive charge 1 anion B Ions having negative charge 2 -1 C Oxidation number of fluorine in NaF 3 0 D The sum of oxidation number of all atoms in a neutral molecule 4 cation
• 5)

Assertion (A): Among halogens fluorine is the best oxidant. Reason
(R): Fluorine is the most electronegative atom.

#### Most expected three mark questions in Basic Concepts of Chemistry and Chemical Calculations - IV English medium - by Karthi - Apr 27, 2019 - View & Read

• 1)

Balance the following reaction:
Sb3++ Mn${ O }_{ 4 }^{ - }$$\rightarrow$ Sb5++ Mn2+

• 2)

Define the following: (i) Element, (ii) Compound.

• 3)

Give two examples of elementary molecules which are (i) Monoatomic (ii) Diatomic and (iii) Polyatomic.

• 4)

Define a.m.u or unified atomic mass.

• 5)

Calculate the mass of the following atoms in a.m.u (unified atomic mass).

#### English medium Most expected three mark questions in Basic Concepts of Chemistry and Chemical Calculations - III - by Karthi - Apr 27, 2019 - View & Read

• 1)

Calculate the number of atoms/molecules present in the following 1Kg of acetic acid

• 2)

The approximate production of Na2C03 per month is 424 x 106gwhile that of methyl alcohol is 320 x 106g. Which is produced more in terms of moles?

• 3)

Calculate number of moles of carbon atoms in three .moles of ethane.

• 4)

Find the molecular mass of FeSO47H2O.

• 5)

Calculate the number of moles present in the following 50g of calcium chloride

#### English medium Most expected three mark questions in Basic Concepts of Chemistry and Chemical Calculations - II - by Karthi - Apr 27, 2019 - View & Read

• 1)

(i) If an acid is mono basic, how will you relate their equivalent mass and molecular mass.
(ii) What is the basicity of H4 P2 O7 ?
(iii) Give any two examples for dibasic acids.

• 2)

Why are the atomic mass of most of the elements fractional?

• 3)

Write down the formulae for calculating the equivalent mass of an acid, base and oxidizing agent.

• 4)

1.05g of a metal gives on oxidation 1.5g of its oxide. Calculate its equivalent mass.

• 5)

Calculate Equivalent mass of the Hydrochloric acid

#### Public exam five mark questions in Basic Concepts of Chemistry and Chemical Calculations English medium - by Karthi - Apr 27, 2019 - View & Read

• 1)

Write note on combination reaction.

• 2)

Write note on decomposition reaction

• 3)

Explain displacement reaction.

• 4)

What are disproportionation reaction?

• 5)

Arrange the elements silver, Zinc and copper in the order of their decreasing electron releasing tendency and justify your arrangement with an appropriate experiment.

#### Most expected three mark questions in Basic Concepts of Chemistry and Chemical Calculations chapter - 1 ENglish medium - by Karthi - Apr 27, 2019 - View & Read

• 1)

Classify the following species into acids and bases according to Lewis concept.
S2-, H+, OH-, BF3' Ni2+, F-

• 2)

MnO42- undergoes disproportionation reaction in acidic medium but MnO4- does not. Give reason.

• 3)

Categorise the redox reactions that occur in our daily life

• 4)

2Cu2S + 3O2 $\longrightarrow$ 2Cu2O + 2SO2
(i) In this reaction which substance is getting oxidised and which substance is getting reduced?
(ii) Name the oxidising and reducing agents.

• 5)

How would you know whether a redox reaction is taking place in an acidic, alkaline or neutral medium?

#### Creative two mark questions Basic Concepts of Chemistry and Chemical Calculations English medium - II - by Karthi - Apr 27, 2019 - View & Read

• 1)

Calculate the equivalent mass of the following - Aluminium hydroxide

• 2)

Calculate the equivalent mass of the following - Sodium Hydroxide

• 3)

Calculate the equivalent mass of the following - Potassium Sulphate

• 4)

Explain the term limiting reagent.

• 5)

3 grams of hydrogen reacts with 29 g of O, to yield H2O. Which is the limiting reagent?

#### Creative two mark questions Basic Concepts of Chemistry and Chemical Calculations English medium - by Karthi - Apr 27, 2019 - View & Read

• 1)

Calculate the molar mass of the following compounds. - acetone [CH3 COCH3]

• 2)

Calculate the molar mass of the following compounds. -boric Acid [H3BO3]

• 3)

Calculate the molar mass of the following compounds. -Sulphurci  Acid [H2SO4]

• 4)

Balance the following equations by ion electron method - ${ C }_{ 2 }{ O }_{ 4 }^{ 2- }+{ Cr }_{ 2 }{ O }_{ 7 }^{ 2- }\longrightarrow { Cr }^{ 3+ }+{ CO }_{ 2 }$ (in acid medium)

• 5)

Balance the following equations by ion electron method ${ Na }_{ 2 }{ S }_{ 2 }{ O }_{ 3 }+{ I }_{ 2 }\longrightarrow { Na }_{ 2 }{ S }_{ 4 }{ O }_{ 6 }+NaI$

#### Basic Concepts of Chemistry and Chemical Calculations important one mark questions English medium - by Karthi - Apr 27, 2019 - View & Read

• 1)

The oxidation state of a element in its uncombined state is

• 2)

Fe2 + $\longrightarrow$ Fe3+ + e- is a ________ reaction.

• 3)

Assertion: Fluorine has an oxidation state of - 1in all its compounds.
Reason: Fluorine is the most electronegative element of the periodic table.

• 4)

The oxidation number of oxygen in O2 is _______________

• 5)

The oxidation number of hydrogen in LiH is _____________

#### 11th Standard Chemistry Public Exam March 2019 Important Creative 3 Mark Questions and Answers - by Karthi - Mar 16, 2019 - View & Read

• 1)

Calculate the oxidation number of underlined atoms of the following:
K2CrO4

• 2)

Calculate the equivalent mass of potassium dichromate in acid medium
[K2Cr2O7 + 4H2SO4 )$\rightarrow$K2SO4 + Cr2(SO4)3 +4H2O + 3(O) 3 x 16 = 48 294 g]

• 3)

Calculate the oxidation number of underlined atoms${ C }_{ \underline { 6 } }{ H }_{ 12 }{ O }_{ 6 }$

• 4)

Calculate the number of moles present in the following 19.5g of potassium

• 5)

Calculate the equivalent mass of barium hydroxide

#### 11th Standard Chemistry Public Exam March 2019 Important Creative One Mark Test 1 - by Karthi - Mar 16, 2019 - View & Read

• 1)

The oxidation state of a element in its uncombined state is

• 2)

Fe2 + $\longrightarrow$ Fe3+ + e- is a ________ reaction.

• 3)

The oxidation number of hydrogen in LiH is _____________

• 4)

The oxidation number of Cr in Cr2O72- __________ is

• 5)

Maximum oxidation state is present in the central metal atom of which compound

#### 11th Standard Chemistry Public Exam March 2019 Important One Marks Questions - by Karthi - Mar 13, 2019 - View & Read

• 1)

Assertion: Two mole of glucose contains 12.044 x 1023 molecules of glucose
Reason: Total number of entities present in one mole of any substance is equal to 6.02 x 1022

• 2)

When 22.4 litres of H2(g) is mixed with 11.2 litres of Cl2(g), each at 273 K at 1 atm the moles of HCl (g), formed is equal to

• 3)

7.5 g of a gas occupies a volume of 5.6 litres at 0° C and 1 atm pressure. The gas is

• 4)

The equivalent mass of ferrous oxalate is __________.

• 5)

Two 22.4 litre containers A and B contains 8 g of O2 and 8 g of SO2 respectively at 273 K and 1 atm pressure, then

#### 11th Standard Chemistry Public Exam March 2019 Important Creative Questions and Answers - by Karthi - Mar 13, 2019 - View & Read

• 1)

Define relative atomic mass.

• 2)

What do you understand by the term oxidation number?

• 3)

Balance the following equations by ion electron method - ${ C }_{ 2 }{ O }_{ 4 }^{ 2- }+{ Cr }_{ 2 }{ O }_{ 7 }^{ 2- }\longrightarrow { Cr }^{ 3+ }+{ CO }_{ 2 }$ (in acid medium)

• 4)

Balance the following equations by oxidation number method - ${ KMn }O_{ 4 }+{ H }_{ 2 }{ C }_{ 2 }{ O }_{ 4 }+{ H }_{ 2 }{ SO }_{ 4 }\longrightarrow { K }_{ 2 }{ SO }_{ 4 }+{ MnSO }_{ 4 }+{ CO }_{ 2 }+{ H }_{ 2 }O$

• 5)

Give examples for the following redox reaction "Metal displacement reaction".

#### Plus One Chemistry Public Exam March 2019 One Mark Question Paper - by Karthi - Mar 13, 2019 - View & Read

• 1)

An element X has the following isotopic Composition 200X = 90%, 199X = 8% and 202X = 2% The Weighted average atomic mass of the element X is closet to

• 2)

The equivalent mass of a trivalent metal element is 9 g eq-1 the molar mass of its anhydrous oxide is

• 3)

Total number of electrons present in 1.7 g of ammonia is

• 4)

Identify disproportionation reaction

• 5)

Which of the following statement(s) is/are not true about the following decomposition reaction.
2KClO3 $\longrightarrow$ 2KCl + 3O2
(i) Potassium is undergoing oxidation
(ii) Chlorine is undergoing oxidation
(iii) Oxygen is reduced
(iv) None of the species are undergoing oxidation and reduction.

#### 11th Standard Chemistry Public Exam March 2019 Important 5 Marks Questions - by Karthi - Mar 13, 2019 - View & Read

• 1)

Calculate the molar mass of the following compounds. -
i) urea [CO(NH2)2]
ii) acetone [CH3 COCH3]
iii) boric Acid [H3BO3]
iv) Sulphurci  Acid [H2SO4]

• 2)

The reaction between aluminum and ferric oxide can generate temperatures up to 3273 K and is used in welding metals. (Atomic mass of AC = 27 u atomic mass of O = 16 u )
2Al + Fe2O3 $\longrightarrow$ Al2O3 + 2Fe;  If in this process, 324 g of aluminum is allowed to react with 1.12 kg of ferric oxide
i) Calculate the mass of Al2O3 formed
ii) How much of the excess reagent is left at the end of the reaction?

• 3)

Write note on decomposition reaction

• 4)

Balance the following equations by oxidation number method
i) ${ K }_{ 2 }{ Cr }_{ 2 }{ O }_{ 7 }+KI+{ H }_{ 2 }SO_{ 4 }\longrightarrow { K }_{ 2 }{ SO }_{ 4 }+{ Cr }_{ 2 }({ SO }_{ 4 })+{ I }_{ 2 }+{ H }_{ 2 }O$
ii) ${ K }Mno_{ 4 }+{ Na }_{ 2 }{ So }_{ 3 }\longrightarrow { MnO }_{ 2 }+{ Na }_{ 2 }{ So }_{ 4 }+KOH$
iii) $Cu+{ HNO }_{ 3 }\longrightarrow Cu\left( { No }_{ 3 } \right) _{ 2 }+{ No }_{ 2 }+{ H }_{ 2 }O$
iv) ${ KMn }O_{ 4 }+{ H }_{ 2 }{ C }_{ 2 }{ O }_{ 4 }+{ H }_{ 2 }{ SO }_{ 4 }\longrightarrow { K }_{ 2 }{ SO }_{ 4 }+{ MnSO }_{ 4 }+{ CO }_{ 2 }+{ H }_{ 2 }O$

• 5)

Explain the term competitive electron transfer reaction with an example.

#### internal - by Demo Chemistry New - Mar 06, 2019 - View & Read

• 1)

Assertion: Fluorine has an oxidation state of - 1in all its compounds.
Reason: Fluorine is the most electronegative element of the periodic table.

• 2)

The oxidation number of oxygen in O2 is _______________

• 3)

Rusting of iron articles is an example of ___________ reaction

• 4)

Distinguish between oxidation and reduction.

• 5)

The density of carbon dioxide is equal to 1.965 kgm-3 at 273 K and 1 atm pressure. calculate the molar mass of CO2

#### 11th Standard Chemistry Public Exam March 2019 Model Question Paper - by Karthi - Mar 04, 2019 - View & Read

• 1)

22 g of CO2 contains ____________ molecules of CO2.

• 2)

For d-electron, the orbital angular momentum is

• 3)

(1) inverse proportion to the effective nuclear charge
(2) inverse proportion to the square of the effective nuclear charge.
(3) direct proportion to the screening effect.
(4) direct proportion to the square of screening effect

• 4)

Tritium nucleus contains

• 5)

sodium is stored in

#### Plus One Chemistry Official Public Exam Question Paper 2019 - by Karthi - Mar 04, 2019 - View & Read

• 1)

The change in the oxidation number of S in H2S and SO2,in the following industrial reaction:
2H2S(g) + SO2(g) $\longrightarrow$ 3S(s) + H2O(g)

• 2)

Time independent Schnodinger wave equation is

• 3)

Match the list I with list II and select the correct answer using the code given below the list.

 List I List II A Ionisation energy 1 ionic compound B electro negativity 2 alloys C s-block elements 3 KJ mol-1 D d-block elements 4 No unit
• 4)

The reaction H3PO2 + D2O ➝ H2DPO2 + HDO indicates that hypo-phosphorus acid is

• 5)

A colourless solid substance (A) on heating evolved CO2 and also gave a white residue, soluble in water. Residue also gave CO2 when treated with dilute HCI

#### 11th Standard Chemistry Basic Concepts of Chemistry and Chemical Calculations Important Questions - by Karthi - Mar 04, 2019 - View & Read

• 1)

An element X has the following isotopic Composition 200X = 90%, 199X = 8% and 202X = 2% The Weighted average atomic mass of the element X is closet to

• 2)

When 6.3g of sodium bicarbonate is added to 30g of the acetic acid solution, the residual solution is found to weigh 33g. The number of moles of carbon dioxide released in the reaction is

• 3)

The oxidation number of oxygen in O2 is _______________

• 4)

Which of the following is/are true with respect to carbon -12

• 5)

The change in the oxidation number of S in H2S and SO2,in the following industrial reaction:
2H2S(g) + SO2(g) $\longrightarrow$ 3S(s) + H2O(g)

#### 11th Standard Chemistry 3rd Revision Test Question and Answer 2019 - by Karthi - Feb 26, 2019 - View & Read

• 1)

Assertion: The number of oxygen atoms in 16g of oxygen and 16g of ozone is same
Reason Each of the species represent 1g atom of oxygen

• 2)

The total number of orbitals associated with the principal quantum number n = 3 is

• 3)

Which of the following statement is incorrect?

• 4)

Zeolite used to soften hardness of water is hydrated

• 5)

The suspension of slaked lime in water is known as

#### 11th Standard Chemistry Public Exam March 2019 Model Question Paper - by Karthi - Feb 18, 2019 - View & Read

• 1)

The number of molecules in 40 g of sodium hydroxide is _______________

• 2)

Two electrons occupying the same orbital are distinguished by

• 3)

The oxidation state of alkali metal is _______

• 4)

Ionic hydrides are formed by

• 5)

Which is the correct sequence of solubility of  carbonates of alkaline earth metals?

#### 11th Standard Chemistry Revision Test Model Question Paper 2019 - by Karthi - Feb 18, 2019 - View & Read

• 1)

In the reaction 2AuCl3 + 3SnCl2 $\rightarrow$ 2Au + 3SnCl4 which is an oxidising agent?

• 2)

What is the maximum numbers of electrons that can be associated with the following set of quantum numbers? n = 3, I = 1 and m =-1

• 3)

In the modern periodic table, the period indicates the value of____

• 4)

Zeolite used to soften hardness of water is hydrated

• 5)

The name 'Blue John' is given to which of the following compounds?

#### 11th Stateboard Chemistry Periodic Classification Of Elements Important Questions - by Karthi - Feb 15, 2019 - View & Read

• 1)

The electronic configuration of the elements A and Bare 1s2, 2s 2,2p6,3s2 and 1s2, 2s2,2p5 respectively. The formula of the ionic compound that can be formed between these elements is

• 2)

Period of an element is represented by _____ quantum number

• 3)

Which of the following statement (s) about the Modern Periodic Table is are incorrect
i. The elements in the Modern Periodic Table are arranged on the basis of their decreasing atomic number.
ii. The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic masses.
iii. Isotopes are placed in adjoining group (s) in the Periodic Table.
iv. The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic number.

• 4)

The atomic weight of Au is ______

• 5)

The vertical columns in the periodic table are called as

#### 11th Standard Chemistry Model Question Paper 2019 - by K Sudhakar - Jan 27, 2019 - View & Read

• 1)

7.5 g of a gas occupies a volume of 5.6 litres at 0° C and 1 atm pressure. The gas is

• 2)

Which of the following provides the experimental justification of magnetic quantum number?

• 3)

Which one of the following is true about metallic character when we move from left to right in a period and top to bottom in a group?

• 4)

Which pair are not hydrogen isotopes?

• 5)

Which of the following has the highest tendency to give the reaction $M_{g}^{+}\xrightarrow[Medium]{Aqueous}M_{aq}^{+}$

#### +1 Chemistry First Revision Test Model question paper and answer - by Karthi - Dec 27, 2018 - View & Read

• 1)

One 'U' stands for the mass of

• 2)

How many electrons in an atom with atomic number 105 can have (n + I) = 8 ?

• 3)

Which of the following N3-, O2-, F- is largest in size?

• 4)

A commercial sample of hydrogen peroxide marked as 100 volume H2O2, it means that

• 5)

Which of the following statements is in correct?

#### 11th Chemistry Half Yearly Important Questions paper - by Karthi - Dec 27, 2018 - View & Read

• 1)

Identify the correct statement(s) with respect to the following reaction :
Zn + 2HCl $\longrightarrow$ ZnCl2 + H2
(i) Zinc is acting as an oxidant
(ii) Chlorine is acting as a reductant
(iii) Hydrogen is not acting as an oxidant
(iv) Zn is acting as a reductant

• 2)

What is the maximum numbers of electrons that can be associated with the following set of quantum numbers? n = 3, I = 1 and m =-1

• 3)

Match the list-I and list-II using the code given below the list

 List-I List-II A.Law of triads 1.Chancourtois B.Law of octaves 2.Henry Moseley C.First periodic law 3.Newland D.Modem periodic law 4.Johann Dobereiner
• 4)

Which of the following statements about hydrogen is incorrect?

• 5)

Assertion : BeSO4 is soluble in water while BaSO4 is not
Reason : Hydration energy decreases down the group from Be to Ba and lattice energy remains almost constant.

#### Haloalkanes and Haloarenes Important Questions - by Karthi - Dec 14, 2018 - View & Read

• 1)

Of the following compounds, which has the highest boiling point?

• 2)

In the reaction  X is ________.

• 3)

The name of C2F4Cl2 is ___________

• 4)

Freon-12 is manufactured from tetrachloro methane by

• 5)

Silverpropionate when refluxed with Bromine in carbontetrachloride gives

#### Environmental Chemistry Important Questions from 11th Chemistry - by Karthi - Dec 06, 2018 - View & Read

• 1)

Which sequence for green house gases is based on GWP?

• 2)

Biochemical oxygen Demand value less than 5 ppm indicates a water sample to be

• 3)

Assertion (A): If BOD level of water in a reservoir is more than 5 ppm it is highly polluted
Reason(R) : High biological oxygen demand means high activity of bacteria in water

• 4)

High concentration of lead in human blood damages

• 5)

Green house gases cause

#### 11th Standard Chemistry Half Yearly Model Question Paper 1 - by Karthi - Nov 29, 2018 - View & Read

• 1)

Hot concentrated sulphuric acid is a moderately strong oxidizing agent. Which of the following reactions does not show oxidising behaviour?

• 2)

Which of the following pairs of d-orbitals will have electron density along the axes ?

• 3)

The value of Bohr radius for hydrogen atom is

• 4)

In which of the following options the order of arrangement does not agree with the variation of property indicated against it?

• 5)

The highest ionization energy is exhibited by_________

#### 11th Standard Chemistry Unit Test Important Questions - by K RAJA - Nov 16, 2018 - View & Read

• 1)

If Kb and Kf for a reversible reactions are 0.8 ×10–5 and 1.6 × 10–4 respectively, the value of the equilibrium constant is,

• 2)

At a given temperature and pressure, the equilibrium constant values for the equilibria
${ 3A }_{ 2 }+{ B }_{ 2 }+2C\overset { { K }_{ 1 } }{ \rightleftharpoons } { 2A }_{ 3 }BC$ and
${ A }_{ 3 }BC\overset { { K }_{ 2 } }{ \rightleftharpoons } 3/2\left[ { A }_{ 2 } \right] +\frac { 1 }{ 2 } { B }_{ 2 }+C$
The relation between K1 and K2 is

• 3)

The equilibrium constant for a reaction at room temperature is K1 and that at 700 K is K2. If K1 > K2, then

• 4)

The formation of ammonia from N2(g) and H2(g) is a reversible reaction
N2(g) + 3H2(g) ⇌ 2NH3(g) + Heat
What is the effect of increase of temperature on this equilibrium reaction

• 5)

Solubility of carbon dioxide gas in cold water can be increased by

#### 11th Standard Chemistry Unit Test Question Paper - by K RAJA - Nov 14, 2018 - View & Read

• 1)

The molality of a solution containing 1.8g of glucose dissolved in 250g of water is

• 2)

Which of the following concentration terms is/are independent of temperature

• 3)

Stomach acid, a dilute solution of HCl can be neutralised by reaction with Aluminium hydroxide
Al (OH)3 + 3HCl (aq) → AlCl3 + 3 H2O
How many millilitres of 0.1 M Al(OH)3 solution are needed to neutralise 21 mL of 0.1 M HCl?

• 4)

The partial pressure of nitrogen in air is 0.76 atm and its Henry's law constant is 7.6 × 104 atm at 300K. What is the mole fraction of nitrogen gas in the solution obtained when air is bubbled through water at 300K?

• 5)

The Henry's law constant for the solubility of Nitrogen gas in water at 350 K is 8 × 104 atm. The mole fraction of nitrogen in air is 0.5. The number of moles of Nitrogen from air dissolved in 10 moles of water at 350K and 4 atm pressure is

#### 11th Standard Chemistry Monthly Test Model Questions - by K RAJA - Oct 22, 2018 - View & Read

• 1)

For alkali metals, which one of the following trends is incorrect?

• 2)

Which of the following statements is in correct?

• 3)

Which of the following compounds will not evolve H2 gas on reaction with alkali metals?

• 4)

Which of the following has the highest tendency to give the reaction $M_{g}^{+}\xrightarrow[Medium]{Aqueous}M_{aq}^{+}$

• 5)

sodium is stored in

#### Important 5mark -chapter 9,10 - by Karthi - Sep 30, 2018 - View & Read

• 1)

Calculate the proportion of O2 and N2 dissolved in water at 298 K. When air containing 20% O2 and 80% N2 by volume is in equilibrium with it at 1 atm pressure. Henry’s law constants for two gases are KH(O2) = 4.6 x 104 atm and KH (N2) = 8.5 x 104 atm.

• 2)

Calculate the mole fractions of benzene and naphthalene in the vapour phase when an ideal liquid solution is formed by mixing 128 g of naphthalene with 39 g of benzene. It is given that the vapour pressure of pure benzene is 50.71 mmHg and the vapour pressure of pure naphthalene is 32.06 mmHg at 300 K.

• 3)

An aqueous solution of 2% nonvolatile solute exerts a pressure of 1.004 bar at the boiling point of the solvent. What is the molar mass of the solute when PA is 1.013 bar?

• 4)

2.56 g of Sulphur is dissolved in 100g of carbon disulphide. The solution boils at 319. 692 K. What is the molecular formula of Sulphur in solution The boiling point of CS2 is 319. 450K. Given that Kb for CS2 = 2.42 K Kg mol-1.

• 5)

Ethylene glycol (C2H6O2) can be at used as an antifreeze in the radiator of a car. Calculate the temperature when ice will begin to separate from a mixture with 20 mass percent of glycol in water used in the car radiator. Kf for water = 1.86 K Kg mol-1 and molar mass of ethylene glycol is 62 g mol-1.

#### Important 3mark -chapter 9,10 - by Karthi - Sep 30, 2018 - View & Read

• 1)

If 5.6 g of KOH is present in (a) 500 mL and (b) 1 litre of solution, calculate the molarity of each of these solutions.

• 2)

2.82 g of glucose is dissolved in 30 g of water. Calculate the mole fraction of glucose and water.

• 3)

What volume of 4M HCl and 2M HCl should be mixed to get 500 mL of 2.5 M HCl?

• 4)

How much volume of 6 M solution of NaOH is required to prepare 500 mL of 0.250 M NaOH solution.

• 5)

0.24 g of a gas dissolves in 1 L of water at 1.5 atm pressure. Calculate the amount of dissolved gas when the pressure is raised to 6.0 atm at constant temperature.

#### Important 2mark -chapter 9,10 - by Karthi - Sep 30, 2018 - View & Read

• 1)

The antiseptic solution of iodopovidone for the use of external application contains 10 % w/v of iodopovidone. Calculate the amount of iodopovidone present in a typical dose of 1.5 mL.

• 2)

A litre of sea water weighing about 1.05 kg contains 5 mg of dissolved oxygen (O2). Express the concentration of dissolved oxygen in ppm.

• 3)

Explain why the aquatic species are more comfortable in cold water during winter season rather than warm water during the summer.

• 4)

At 400 K 1.5 g of an unknown substance is dissolved in solvent and the solution is made to 1.5 L. Its osmotic pressure is found to be 0.3 bar. Calculate the molar mass of the unknown substance.

• 5)

Define (i) molality (ii) Normality.

#### Important 1mark -chapter 9,10 - by Karthi - Sep 30, 2018 - View & Read

• 1)

Stomach acid, a dilute solution of HCl can be neutralised by reaction with Aluminium hydroxide
Al (OH)3 + 3HCl (aq) → AlCl3 + 3 H2O
How many millilitres of 0.1 M Al(OH)3 solution are needed to neutralise 21 mL of 0.1 M HCl?

• 2)

The partial pressure of nitrogen in air is 0.76 atm and its Henry's law constant is 7.6 × 104 atm at 300K. What is the mole fraction of nitrogen gas in the solution obtained when air is bubbled through water at 300K?

• 3)

Which one of the following is incorrect for ideal solution?

• 4)

Which one of the following gases has the lowest value of Henry's law constant?

• 5)

P1 and P2 are the vapour pressures of pure liquid components, 1 and 2 respectively of an ideal binary solution if x1 represents the mole fraction of component 1, the total pressure of the solution formed by 1 and 2 will be

#### 11th State Board Chemistry Equilibrium and Redox Reactions Important Questions - by Karthi - Sep 30, 2018 - View & Read

• 1)

Which among the following is an intensive property?

• 2)

Match the list I with list II and select the correct answer using the code given below the list.

 List-I List-II A ΔS<0 1 I2(s)⟶I2(g) B ΔG<0 2 $Ice\overset { 273\quad K }{ \rightleftharpoons } Water$ C ΔG=0 3 2O3(g)⟶3O2(g) D ΔS>0 4 $H_{ 2 }O_{ (I) }\overset { 270K }{ \longrightarrow } { H }_{ 2 }O_{ (s) }$
• 3)

In general, for an exothermic reaction to be spontaneous:

• 4)

In the equilibrium,
2A(g) ⇌ 2B(g) + C2(g)
the equilibrium concentrations of A, B and C2 at 400 K are 1 × 10–4 M, 2.0 × 10–3 M, 1.5 × 10–4 M respectively. The value of KC for the equilibrium at 400 K is

• 5)

In a chemical equilibrium, the rate constant for the forward reaction is 2.5 × 102 and the equilibrium constant is 50. The rate constant for the reverse reaction is,

#### 11th Standard Chemistry Thermodynamics and Gaseous State Important 5 Mark Questions - by Karthi - Sep 30, 2018 - View & Read

• 1)

Calculate the standard heat of formation of propane, if its heat of combustion is -2220.2 kJ mol-1. the heats of formation of CO2(g) and H2O(l) are -393.5 and -285.8 kJ mol-1 respectively

• 2)

If an automobile engine burns petrol at a temperature of 816° C and if the surrounding temperature is 21° C, calculate its maximum possible efficiency

• 3)

The heat of combustion of solid naphthalene (C10H10) at constant volume was -4984 kJ mol-1 at 298 K. Calculate the value of enthalpy change.
Given:
C10H8(s)+12O2(g) ➝ 10CO2(g)+4H2O(l)
$\Delta U$=-4984 kJ mol-1
$\Delta U$=-4984 kJ mol-1,R=8.314 JK-1 mol-1
T=298 K

• 4)

The standard heat of formation of H2O(l) from its elements and O2 is -290.83 kJ mol-1 and the standard entropy change for the same reaction is -330 JK-I at 25°C. Will the reaction be spontaneous at 25°C.
Given: $\Delta{H^{o}}$= -290.83 kJ mol-1
= -290830 J mol-1
$\Delta{S^{o}}$ = -330 JK-1
T = 25°C = 298 K

• 5)

Calculate the entropy change when 1 mole of ethanol is evaporated at 351 K The molar heat of vaporisation of ethanol is 39.84 kJ mol-1.

#### Important 2mark -chapter 7,8 - by Karthi - Sep 30, 2018 - View & Read

• 1)

State the first law of thermodynamics.

• 2)

Define Hess's law of constant heat summation.

• 3)

Explain intensive properties with two examples

• 4)

What is the usual definition of entropy? What is the unit of entropy?

• 5)

Predict the feasibility of a reaction when
(i) both ΔH and ΔS positive
(ii) both ΔH and ΔS negative
(iii) ΔH decreases but ΔS increases

#### 11th Standard Chemistry Thermodynamics and Gaseous State Important 3 Mark Questions - by Karthi - Sep 30, 2018 - View & Read

• 1)

Define the following terms
(a) isothermal process (b) adiabatic process
(c) isobaric process (d) isochoric process

• 2)

What are state and path functions? Give two examples

• 3)

The equilibrium constant of a reaction is 10, what will be the sign of ΔG? Will this reaction be spontaneous?

• 4)

Define the following terms.

• 5)

Predict the change in internal energy for an isolated system at constant volume.

#### Important 1mark -chapter 7,8 - by Karthi - Sep 30, 2018 - View & Read

• 1)

In a reversible process, the change in entropy of the universe is

• 2)

The intensive property among the quantities below is

• 3)

The enthalpies of formation of Al2O3 and Cr2Oare -1596 kJ and -1134 kJ, respectively. ΔH for the reaction 2AI + Cr2O3 ⟶ 2Cr + Al2O3 is

• 4)

The value of ΔH for cooling 2 moles of an ideal monatomic gas from 125° C to 25° C at constant pressure will be [given Cp=$\frac{5}{2}$R]

• 5)

When 15.68 litres of a gas mixture of methane and propane are fully combusted at 0° C and 1 atmosphere, 32 litres of oxygen at the same temperature and pressure are consumed. The amount of heat of released from this combustion in KJ is (ΔHc (CH4) = - 890 KJ mol-1 and ΔHc (C3H8 = - 2220 KJ mol-1)

#### Alkali And Alkaline Earth Metals & Gaseous State Important Question Paper In 11th Chemistry - by Karthi - Sep 30, 2018 - View & Read

• 1)

Which of the following compounds will not evolve H2 gas on reaction with alkali metals?

• 2)

A colourless solid substance (A) on heating evolved CO2 and also gave a white residue, soluble in water. Residue also gave CO2 when treated with dilute HCI

• 3)

The general electronic configuration of alkali metals is ____________

• 4)

When an ideal gas undergoes unrestrained expansion, no cooling occurs because the molecules

• 5)

Equal moles of hydrogen and oxygen gases are placed in a container, with a pin-hole through which both can escape what fraction of oxygen escapes in the time required for one-half of the hydrogen to escape.

#### Alkali And Alkaline Earth Metals & Gaseous State Important Five Mark Question Paper In 11th Chemistry - by Karthi - Sep 30, 2018 - View & Read

• 1)

Discuss briefly the similarities between beryllium and aluminium.

• 2)

Alkaline earth metal (A), belongs to 3rd period reacts with oxygen and nitrogen to form compound (B) and (C) respectively. It undergo metal displacement reaction with AgNO3 solution to form compound (D).

• 3)

Explain the important common features of Group 2 elements.

• 4)

Describe briefly the biological Importance of Calcium and magnesium

• 5)

Bring out the simularities between lithium and magnesium.

#### Alkali And Alkaline Earth Metals & Gaseous State Important Three Mark Question Paper In 11th Chemistry - by Karthi - Sep 30, 2018 - View & Read

• 1)

Why sodium hydroxide is much more water soluble than chloride?

• 2)

Write the chemical equations for the reactions involved in solvay process of preparation of sodium carbonate.

• 3)

An alkali metal (x) forms a hydrated sulphate, X2SO4•10H2O. Is the metal more likely to be sodium (or) potassium.

• 4)

Why alkaline earth metals are harder than alkali metals.

• 5)

Which would you expect to have a higher melting point magnesium oxide or magnesium fluoride? Explain your reasoning.

#### Alkali And Alkaline Earth Metals & Gaseous State Important Two Mark Question Paper In 11th Chemistry - by Karthi - Sep 30, 2018 - View & Read

• 1)

Explain what is meant by efflerescence.

• 2)

Give the systematic names for the following
(i) milk of magnesia
(ii) lye
(iii) lime
(iv) Caustic potash
(v) washing soda
(vi) soda ash
(vii) trona

• 3)

Mention the uses of plaster of paris

• 4)

Beryllium halides are Covalent whereas magnesium halides are ionic why?

• 5)

How is plaster of paris prepared?

#### Alkali And Alkaline Earth Metals & Gaseous State Important One Mark Question Paper In 11th Chemistry - by Karthi - Sep 30, 2018 - View & Read

• 1)

Which of the following statements is in correct?

• 2)

Which of the following has the highest tendency to give the reaction $M_{g}^{+}\xrightarrow[Medium]{Aqueous}M_{aq}^{+}$

• 3)

sodium is stored in

• 4)

RbO2 is

• 5)

Lithium shows diagonal relationship with

#### Periodic Classification Of Elements & Hydrogen Important Question Paper In 11th Chemistry - by Karthi - Sep 30, 2018 - View & Read

• 1)

The electronic configuration of the elements A and Bare 1s2, 2s 2,2p6,3s2 and 1s2, 2s2,2p5 respectively. The formula of the ionic compound that can be formed between these elements is

• 2)

Which of the following elements will have the highest electro negativity

• 3)

Various successive ionisation enthalpies (in kJ mol-1) of an element are given below.

 IE1 IE2 IE3 IE4 IE5 577.5 1,810 2,750 11,580 14,820

The element is

• 4)

The correct order of decreasing electronegativity values among the elements X, Y, Z and A with atomic numbers 4, 8,7 and 12 respectively

• 5)

How does electron affinity change when we move from left to right in a period in the periodic table?

#### Periodic Classification Of Elements & Hydrogen Important Five Mark Question Paper In 11th Chemistry - by Karthi - Sep 30, 2018 - View & Read

• 1)

Explain the periodic trend of ionisation potential.

• 2)

Explain the diagonal relationship.

• 3)

By using paulings method calculate the ionic radii of K+ and CI- ions in the potassium chloride crystal. Given that dk+-cl-=3.14 Å.

• 4)

Explain the following, give appropriate reasons.
(i) Ionisation potential of N is greater than that of O.
(ii) First ionisation potential of C-atom is greater than that of B atom, where as the reverse is true is for second ionisation potential.
(iii) The electron affinity values of Be, Mg and noble gases are zero and those of N (0.02 eV) and P (0.80 eV) are very low.
(iv) The formation of F-(g) from F(g) is exothermic while that of O2-(g) from O (g) is endothermic.

• 5)

Calculate the effective nuclear charge experienced by the 4s electron in potassium atom.

#### Periodic Classification Of Elements & Hydrogen Important Three Mark Question Paper In 11th Chemistry - by Karthi - Sep 30, 2018 - View & Read

• 1)

Energy of an electron in the ground state of the hydrogen atom is -2.8 x 10-18 J. Calculate the ionisation enthalpy of atomic hydrogen in terms of kJ mol-1.

• 2)

The electronic configuration of atom is one of the important factor which affects the value of ionisation potential and electron gain enthalpy. Explain.

• 3)

In what period and group will an element with Z = 118 will be present?

• 4)

Mention any two anomalous properties of second period elements.

• 5)

What are metalloids? Give example.

#### Periodic Classification Of Elements & Hydrogen Important Two Mark Question Paper In 11th Chemistry - by Karthi - Sep 30, 2018 - View & Read

• 1)

Define modern periodic law.

• 2)

Define electro negativity.

• 3)

How would you explain the fact that the second ionisation potential is always higher than first ionisation potential?

• 4)

Give the general electronic configuration of lanthanides and actinides.

• 5)

How does atomic and ionic radii vary across the group and period.

#### Periodic Classification Of Elements & Hydrogen Important One Mark Question Paper In 11th Chemistry - by Karthi - Sep 30, 2018 - View & Read

• 1)

The electronic configuration of the elements A and Bare 1s2, 2s 2,2p6,3s2 and 1s2, 2s2,2p5 respectively. The formula of the ionic compound that can be formed between these elements is

• 2)

Various successive ionisation enthalpies (in kJ mol-1) of an element are given below.

 IE1 IE2 IE3 IE4 IE5 577.5 1,810 2,750 11,580 14,820

The element is

• 3)

In the third period the first ionization potential is of the order

• 4)

Identify the wrong statement.

• 5)

Which one of the following arrangements represent the correct order of least negative to most negative electron gain enthalpy

#### Basic Concepts Of Chemistry And Chemical Calculations & Quantum Mechanical Model Of Atom Important Question Paper In 11th Chemistry - by Karthi - Sep 30, 2018 - View & Read

• 1)

Assertion (A): Among halogens fluorine is the best oxidant. Reason
(R): Fluorine is the most electronegative atom.

• 2)

The oxidation number of fluorine in all its compounds is equal to

• 3)

The empirical formula of glucose is _______________

• 4)

The maximum number of electrons in a sub shell is given by the expression

• 5)

What will be the wavelength of a ball of mass 0.1 kg moving with a velocity of 10ms-1?

#### Basic Concepts Of Chemistry And Chemical Calculations & Quantum Mechanical Model Of Atom Important Five Mark Question Paper In 11th Chemistry - by Karthi - Sep 30, 2018 - View & Read

• 1)

Balance the following equation by oxidation number method:
Zn + HNO3 $\rightarrow$Zn(NO3)2 + NH4NO3 + H2O

• 2)

Balance the following equation by ion-electron method In acidic medium.
$S_2O_3^{2-}+I_2\rightarrow S_2O_4^{2-}+SO_2+I^-$

• 3)

Balance the following equation by ion-electron method In acidic medium.
$Cr{(OH)}_4^-+H_2O_2\rightarrow Cr{O}_4^{2-}$

• 4)

An insecticide has the following percentage composition by mass: 47.5% C, 2.54% H, and 50.0% Cl. Determine its empirical formula and molecular formulae. Molar mass of the substance is 354.5g mol-1

• 5)

The Mn3+ ion is unstable in solution and undergoes disproportionation to give Mn2+, MnO2 and H+ ion. Write a balanced ionic equation for the reaction.

#### Basic Concepts Of Chemistry And Chemical Calculations & Quantum Mechanical Model Of Atom Important Three Mark Question Paper In 11th Chemistry - by Karthi - Sep 30, 2018 - View & Read

• 1)

How much mass (in gram units) is represented by the following?
0.2 mol of NH3

• 2)

Calculate the Formula Weights of the following compounds.C6H12O6 - Glucose

• 3)

Calculate the Formula Weights of the following compounds.NaOH

• 4)

Calculate Equivalent mass of the Phosphorous acid

• 5)

Calculate the molar volume of the following 460g of formic acid

#### Basic Concepts Of Chemistry And Chemical Calculations & Quantum Mechanical Model Of Atom Important Two Mark Question Paper In 11th Chemistry - by Karthi - Sep 30, 2018 - View & Read

• 1)

Define equivalent mass

• 2)

Distinguish between oxidation and reduction.

• 3)

Calculate the molar mass of the following compounds. -
i) urea [CO(NH2)2]
ii) acetone [CH3 COCH3]
iii) boric Acid [H3BO3]
iv) Sulphurci  Acid [H2SO4]

• 4)

Calculate the molar mass of the following compounds. -boric Acid [H3BO3]

• 5)

Calculate the average atomic mass of naturally occurring magnesium using the following data

Isotope Istopic atomic mass Abundance(%)
Mg24 23.99 78.99
Mg26 24.99 10.00
Mg25 25.98 11.01

#### Basic Concepts Of Chemistry And Chemical Calculations & Quantum Mechanical Model Of Atom Important One Mark Question Paper In 11th Chemistry - by Karthi - Sep 30, 2018 - View & Read

• 1)

Assertion: Two mole of glucose contains 12.044 x 1023 molecules of glucose
Reason: Total number of entities present in one mole of any substance is equal to 6.02 x 1022

• 2)

1 g of an impure sample of magnesium carbonate (containing no thermally decomposable impurities) on complete thermal decomposition gave 0.44 g of carbon dioxide gas. The percentage of impurity in the sample is ______________

• 3)

When 22.4 litres of H2(g) is mixed with 11.2 litres of Cl2(g), each at 273 K at 1 atm the moles of HCl (g), formed is equal to

• 4)

Hot concentrated sulphuric acid is a moderately strong oxidizing agent. Which of the following reactions does not show oxidising behaviour?

• 5)

Fe2 + $\longrightarrow$ Fe3+ + e- is a ________ reaction.

#### 11th Chemistry Important Question Paper 4 - by Karthi - Sep 22, 2018 - View & Read

• 1)

The electronic configuration of the elements A and Bare 1s2, 2s 2,2p6,3s2 and 1s2, 2s2,2p5 respectively. The formula of the ionic compound that can be formed between these elements is

• 2)

The group of elements in which the differentiating electron enters the anti penultimate shell of atoms are called

• 3)

How does electron affinity change when we move from left to right in a period in the periodic table?

• 4)

Which of the following pairs of elements exhibit diagonal relationship?

• 5)

Period of an element is represented by _____ quantum number

#### 11th Chemistry Term 2 Question Paper - by Karthi - Sep 22, 2018 - View & Read

• 1)

In which of the following Compounds does the central atom obey the octet rule?

• 2)

In the molecule O= C = OB, the formal charge on OA, C and OB are respectively.

• 3)

Which of the following is electron deficient?

• 4)

Which of the following molecule contain no л bond?

• 5)

Of the following molecules, which have shape similar to carbondixide?

#### 11th Chemistry Important Question Paper 2 - by Karthi - Sep 22, 2018 - View & Read

• 1)

The number of water molecules in a drop of water weighing 0.018 g is

• 2)

1 g of an impure sample of magnesium carbonate (containing no thermally decomposable impurities) on complete thermal decomposition gave 0.44 g of carbon dioxide gas. The percentage of impurity in the sample is ______________

• 3)

When 6.3g of sodium bicarbonate is added to 30g of the acetic acid solution, the residual solution is found to weigh 33g. The number of moles of carbon dioxide released in the reaction is

• 4)

When 22.4 litres of H2(g) is mixed with 11.2 litres of Cl2(g), each at 273 K at 1 atm the moles of HCl (g), formed is equal to

• 5)

The oxidation number of oxygen in O2 is _______________

#### 11th Chemistry Model Paper 2 - by Karthi - Sep 15, 2018 - View & Read

• 1)

Which of the following statements about hydrogen is incorrect?

• 2)

Water gas is

• 3)

The cause of permanent hardness of water is due to

• 4)

Zeolite used to soften hardness of water is hydrated

• 5)

A commercial sample of hydrogen peroxide marked as 100 volume H2O2, it means that

#### 11th Chemistry Model Question Paper 1 - by Karthi - Sep 15, 2018 - View & Read

• 1)

Which of the following statements about hydrogen is incorrect?

• 2)

Water gas is

• 3)

The hardness of water can be determined by volumetrically using the reagent

• 4)

The cause of permanent hardness of water is due to

• 5)

Zeolite used to soften hardness of water is hydrated

#### 11th Chemistry Important One Mark Question Paper 1 - by K RAJA - Sep 08, 2018 - View & Read

• 1)

40 ml of methane is completely burnt using 80 ml of oxygen at room temperature The volume of gas left. after cooling to room temperature is

• 2)

An element X has the following isotopic Composition 200X = 90%, 199X = 8% and 202X = 2% The Weighted average atomic mass of the element X is closet to

• 3)

Assertion: Two mole of glucose contains 12.044 x 1023 molecules of glucose
Reason: Total number of entities present in one mole of any substance is equal to 6.02 x 1022

• 4)

Carbon forms two oxides, namely carbon monoxide and carbon dioxide. The equivalent mass of which element remains constant?

• 5)

The equivalent mass of a trivalent metal element is 9 g eq-1 the molar mass of its anhydrous oxide is

#### 11th chemistry p - Block Elements important question paper - by K RAJA - Sep 07, 2018 - View & Read

• 1)

The electronic configuration of the elements A and Bare 1s2, 2s 2,2p6,3s2 and 1s2, 2s2,2p5 respectively. The formula of the ionic compound that can be formed between these elements is

• 2)

The group of elements in which the differentiating electron enters the anti penultimate shell of atoms are called

• 3)

In which of the following options the order of arrangement does not agree with the variation of property indicated against it?

• 4)

Which of the following elements will have the highest electro negativity

• 5)

Various successive ionisation enthalpies (in kJ mol-1) of an element are given below.

 IE1 IE2 IE3 IE4 IE5 577.5 1,810 2,750 11,580 14,820

The element is

#### 11th standard Coordination Compounds and Bio-Coordination Compounds - by K RAJA - Sep 03, 2018 - View & Read

• 1)

Gases deviate from ideal behavior at high pressure. Which of the following statement(s) is correct for non-ideality?

• 2)

Rate of diffusion of a gas is

• 3)

Which of the following is the correct expression for the equation of state of van der Waals gas?

• 4)

When an ideal gas undergoes unrestrained expansion, no cooling occurs because the molecules

• 5)

Equal weights of methane and oxygen are mixed in an empty container at 298 K. The fraction of total pressure exerted by oxygen is

#### Quantum Mechanical Model Of Atom Important Question Paper - by MUTHUSAMY K - Aug 25, 2018 - View & Read

• 1)

How many orbitals are possible for n =4?

• 2)

How many radial nodes for 2s, 4p, 5d and 4f orbitals exhibit? How many angular nodes

• 3)

Which quantum number reveal information about the shape, energy, orientation and size of orbitals?

• 4)

What are the defects of Rutherford's model?

• 5)

What is the charge and mass of an electron?

#### Important One Mark Question Paper In 11th Chemistry - by Karthi - Aug 06, 2018 - View & Read

• 1)

Carbon forms two oxides, namely carbon monoxide and carbon dioxide. The equivalent mass of which element remains constant?

• 2)

The oxidation number of oxygen in O2 is _______________

• 3)

7.5 g of a gas occupies a volume of 5.6 litres at 0° C and 1 atm pressure. The gas is

• 4)

Give an example of molecule in which the ratio of the molecular formula is six times the empirical formula.

• 5)

The compound in which mass percentage of carbon is 75% and that of hydrogen is 25% is

#### 11th Chemistry Term I Model Question Paper - by Karthi - Aug 03, 2018 - View & Read

• 1)

40 ml of methane is completely burnt using 80 ml of oxygen at room temperature The volume of gas left. after cooling to room temperature is

• 2)

An element X has the following isotopic Composition 200X = 90%, 199X = 8% and 202X = 2% The Weighted average atomic mass of the element X is closet to

• 3)

The number of water molecules in a drop of water weighing 0.018 g is

• 4)

Which one of the following represents 180g of water?

• 5)

The oxidation number of Cr in Cr2O72- __________ is

#### Thermodynamics Important Question Paper In 11th Chemistry - by Karthi - Aug 02, 2018 - View & Read

• 1)

The enthalpies of formation of Al2O3 and Cr2Oare -1596 kJ and -1134 kJ, respectively. ΔH for the reaction 2AI + Cr2O3 ⟶ 2Cr + Al2O3 is

• 2)

Which of the following is not a thermodynamic function?

• 3)

The value of ΔH for cooling 2 moles of an ideal monatomic gas from 125° C to 25° C at constant pressure will be [given Cp=$\frac{5}{2}$R]

• 4)

Given that C(g)+ O2(g) ⟶ CO2(g)ΔHo =-akJ;2CO(g)+O2(g) ⟶ 2CO2(g)ΔHo=-bkJ; Calculate the AHo for the reaction C(g)+ 1/2O2(g) ⟶ CO(g)

• 5)

When 15.68 litres of a gas mixture of methane and propane are fully combusted at 0° C and 1 atmosphere, 32 litres of oxygen at the same temperature and pressure are consumed. The amount of heat of released from this combustion in KJ is (ΔHc (CH4) = - 890 KJ mol-1 and ΔHc (C3H8 = - 2220 KJ mol-1)

#### Gaseous State Important Question Paper In 11th Chemistry - by Karthi - Aug 01, 2018 - View & Read

• 1)

Which of the following is the correct expression for the equation of state of van der Waals gas?

• 2)

When an ideal gas undergoes unrestrained expansion, no cooling occurs because the molecules

• 3)

Equal weights of methane and oxygen are mixed in an empty container at 298 K. The fraction of total pressure exerted by oxygen is

• 4)

The value of universal gas constant depends upon

• 5)

The value of the gas constant R is

#### 11th Chemistry Important Question Paper 1 - by Karthi - Aug 01, 2018 - View & Read

• 1)

Find the wrong statement

• 2)

Lithium shows diagonal relationship with

• 3)

In case of alkali metal halides, the ionic character increases in the order

• 4)

In which process, fused sodium hydroxide is electro lysed for extraction of sodium

• 5)

Assertion Generally alkali and alkaline earth metals form superoxides
Reason There is a single bond between O and 0 in superoxides

#### Hydrogen Important Question Paper In 11th Chemistry - by Karthi - Aug 01, 2018 - View & Read

• 1)

Non-stoichiometric hydrides are formed by

• 2)

If a body of a fish contains 1.2 g hydrogen in its total body mass, if all the hydrogen is replaced with deuterium then the increase in body weight of the fish will be

• 3)

The hardness of water can be determined by volumetrically using the reagent

• 4)

Zeolite used to soften hardness of water is hydrated

• 5)

A commercial sample of hydrogen peroxide marked as 100 volume H2O2, it means that

#### Periodic Classification Of Elements Important Question Paper In 11th Chemistry - by Karthi - Jul 28, 2018 - View & Read

• 1)

In the third period the first ionization potential is of the order

• 2)

Identify the wrong statement.

• 3)

The correct order of decreasing electronegativity values among the elements X, Y, Z and A with atomic numbers 4, 8,7 and 12 respectively

• 4)

The electronic configuration of the atom having maximum difference in first and second ionisation energies is

• 5)

The First ionisation potential of Na, Mg and Si are 496, 737 and 786 kJ mol-1 respectively. The ionisation potential of Al will be closer to

#### 11th Chemistry Important Question Paper 3 - by Karthi - Jul 28, 2018 - View & Read

• 1)

According to the Bohr Theory, which of the following transitions in the hydrogen atom will give rise to the least energetic photon?

• 2)

Choose isosteres from the following

• 3)

Which of the following is a pair of isoelectronic species?

• 4)

Which of the following statements about the electron is incorrect?

• 5)

According to Bohr's theory, the angular momentum of electron in 5th orbit is

#### Basic Concepts Of Chemistry And Chemical Calculations Model Question Paper In 11th Chemistry - by Karthi - Jul 26, 2018 - View & Read

• 1)

What is the mass of precipitate formed when 50 ml of 8.5 % solution of AgNO3 is mixed with 100 ml of 1.865 % potassium chloride solution?

• 2)

Which among the following statement(s) describe an element?
i) It is a pure substance which could be split into two or more simpler substance.
ii) It is a pure substance which cannot be split into simpler substance
iii) It's composition is not uniform
iv) All the above

• 3)

How many moles of magnesium phosphate Mg3(PO4)2 Will Contain 0.25 moles of oxygen atoms?

• 4)

Assertion: Equal volumes of all the gases do not contain equal number of atoms
Reason: Atom is the smallest particle which takes part in chemical reactions.

• 5)

Two elements X and Y ( atomic mass of X = 75; Y = 16) combine to give a compound having 76% of X. The formula of the compound is?

#### 11th Chemistry Important One Mark Question Paper 2 - by Karthi - Jul 26, 2018 - View & Read

• 1)

40 ml of methane is completely burnt using 80 ml of oxygen at room temperature The volume of gas left. after cooling to room temperature is

• 2)

The number of water molecules in a drop of water weighing 0.018 g is

• 3)

Fe2 + $\longrightarrow$ Fe3+ + e- is a ________ reaction.

• 4)

The oxidation number of hydrogen in LiH is _____________

• 5)

Rusting of iron articles is an example of ___________ reaction