CBSE Class 11 Chemistry MCQs - Chemical Equilibrium

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CBSE Class 11 Chemistry MCQs - Chemical Equilibrium CBSE and NCERT students can refer to the attached file. All educational material on the website has been prepared by the best teachers having more than 20 years of teaching experience in various schools. The study material available on our website for all CBSE classes and subjects have been prepared by teachers from all over the country. All study material has been carefully designed keeping into mind the latest CBSE examination trends.  

Chemical Equilibrium

I. MCQ - Choose Appropriate Alternative

1. At equilibrium the rate of forward reaction and the rate of reverse reaction are __________. (Equal, Changing, Different)

2. Such reactions, which proceed to forward direction only and are completed after sometime are called __________ reaction. (Irreversible, Reversible, Molecular)

3. Such reactions, which proceed to both the direction and are never completed, are called __________ reaction. (Irreversible, Reversible, Molecular)

4. The rate of chemical reaction is directly proportional to the product of the molar concentration of __________. (Reactants, Products, Both reactants and products)

5. “If a system in equilibrium is subjected to a stress, the equilibrium shifts in a direction to minimize or undo the effect of this stress. This principle is known as __________. (Le-Chatelier’s Principle, Gay Lussac’s Principle, Avogadro’s Principle)

6. A very large value of Kc indicates that reactants are __________. (very stable, unstable, moderately stable)

7. A very low value of Kc indicates that reactants are __________. (very stable, very unstable, moderately stable)

8. The equilibrium in which reactants are products are in single phase is called __________. (Homogenous Equilibrium, Heterogenous Equilibrium, Dynamic Equilibrium)

9. The equilibrium in which reactants and products are in more than one phases are called __________. (Homogenious Equilibrium, Heterogenious Equilibrium, Dynamic Equilibrium)

10. Chemical Equilibrium is __________ equilibrium. (Dunamic, Static, Heterogeneous)

11. In exothermic reaction, lowering of temperature will shift the equilibrium to __________. (right, left, equally on both the direction)

12. In endothermic reaction, lowering of temperature will shift the equilibrium to __________. (right, left, equally on both the direction)

13. A catalyst __________ the energy of activation. (increases, decreases, has no effect on)

14. At equilibrium point __________. (forward reaction is increased, backward reaction is increased, forward and backward reactions become equal)

15. NH3 is prepared by the reaction N2 + 3H2 → 2NH3 ; ΔH = -21.9 Kcal. The maximum yield of NH3 is obtained __________. (At low temperature and high pressure, at high temperature and low pressure, at high temperature and high pressure)

16. When a high pressure is applied to the following reversible process: N2 + O2 →2NO The equilibrium will __________ (shift to the forward direction, shift to the backward direction, not change)

17. The value of Kc __________ upon the initial concentration of the reaction. (depends, partially depends, does not depend)

18. While writing the Kc expression, the concentration of __________ are taken in the numerator.

19. Solubility product constant is denoted by __________. (Kc, Ksp, Kr)

20. “The degree of ionization of an electrolyte is suppressed by the addition of another electrolyte containing a common ion.” This phenomenon is called __________(Solubility Product, Common Ion Effect, Le-Chatelier’s Principle)

II. Fill in the Blank

1. The reactions, which proceed in both the directions, are called __________ reactions.

2. The reactions, which proceed to one direction only, are called __________ reactions.

3. Reversible reactions are __________ completed.

4. Irreversible reactions are __________ after some time.

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