### 11th Standard Chemistry Study material & Free Online Practice Tests - View and download Sample Question Papers with Solutions for Class 11 Session 2019 - 2020 TN Stateboard

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

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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 & Download

• 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.

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