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11th Standard Chemistry Study material & Free Online Practice Tests - View Model Question Papers with Solutions for Class 11 Session 2019 - 2020
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Chemistry Question Papers

11th Standard Chemistry English Medium Free Online Test Book Back 1 Mark Questions with Answer Key - Part Three - by Uma - Nagapattinam - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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)

    Which one of the following is an example for free radical initiators?

11th Standard Chemistry English Medium Free Online Test Creative 1 Mark Questions - Part Two - by Uma - Nagapattinam - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 electrolysed 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 - 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)

    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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - View & Read

  • 1)

    Unit of Avogadro's number is

  • 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 - 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 - 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 electronic configuration represent the element in ground state?

  • 3)

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

  • 4)

    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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - View & Read

  • 1)

    For an adiabatic process

  • 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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?

View all

TN Stateboard Education Study Materials

TN Stateboard Updated Class 11th Chemistry Syllabus

Basic Concepts of Chemistry and Chemical Calculations

Chemistry-The Centre of Life-Classification of Matter-Atomic and Molecular Masses-Mole Concept-Gram Equivalent Concept-Empirical Formula and Molecular Formula-Stoichiometry-Redox Reactions

Quantum Mechanical Model of Atom

Introduction to Atom Models-Wave Particle Duality of Matter-Heisenberg’s Uncertainty Principle-Quantum Mechanical Model of Atom – Schrodinger Equation-Quantum Numbers-Filling of Orbitals

Periodic Classification of Elements

Introduction-Classification of Elements-Moseley's Work and Modern Periodic Law-Nomenclature of Elements with Atomic Number Greater Than 100-Grouping of Elements Based on Electronic Configurations-Periodic Trends in Properties-Periodic Trends in Chemical Properties

Hydrogen

Introduction-Preparation of Hydrogen-Properties of Hydrogen-Uses of Hydrogen-Compounds of Hydrogen-Heavy Water-Hydrogen Peroxide-Hydrides-Hydrogen Bonding

Alkali and Alkaline Earth Metals

s-block Elements-Alkali Metals-General Characteristics of the Compounds of Alkali Metals-Biological Importance of Sodium and Potassium-Alkaline Earth Metals-General Characteristics of the Compounds of the Alkaline Earth Metals-Biological Importance of Magnesium and Calcium

Gaseous State

Introduction-The Gas Laws-Ideal Gas Equation-Mixture of Gases-Dalton’s Law of Partial Pressures-Deviation from Ideal Gas Behaviour-Pressure-Volume Isotherms of Carbon Dioxide-Liquefaction of Gases

Thermodynamics

Introduction-System and Surrounding-Zeroth Law of Thermodynamics-First Law of Thermodynamics-Enthalpy (H)-Thermochemical Equations-Measurement of ΔU and ΔH Using Calorimetry-Hess’s Law of Constant Heat Summation-Lattice Energy (ΔHlattice)-Second Law of Thermodynamics-Gibbs Free Energy (G)-Third Law of Thermodynamics

TN StateboardStudy Material - Sample Question Papers with Solutions for Class 11 Session 2019 - 2020

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