NCERT Class 11 Chapter 7 Chemistry Chemical Equilibrium MCQ

NCERT Class 11 Chapter 7 Chemistry Chemical Equilibrium MCQ | Questions & Answers: Looking for the right place to take up the NCERT Class 11 Chapter 7 Chemistry Chemical Equilibrium MCQ Quiz? Then, here you go. Make sure that you submit your answers at the end to get instant results.

Page 1 of 3

1. Which of the following is not a general characteristic of equilibria involving physical processes ?

A. All the physical processes stop at equilibrium

B. The opposing processes occur at the same rate and there is a dynamic but stable condition

C. All measurable properties of the system remain constant.

D. Equilibrium is possible only in a closed system at a given temperature.

2. The liquid which has a ____ vapour pressure is more volatile and has a_____boiling point.

A. Higher, lower

B. Higher, higher

C. Lower, lower

D. Lower, higher

3. Boiling point of the liquid depends on the atmospheric pressure. It depends on the altitude of the place; at high altitude the boiling point…………..

A. decreases

B. increases

C. either decreases or increases

D. remains same

4. In an experiment three watch glasses containing separately 1mL each of acetone, ethyl alcohol, and water are exposed to atmosphere and the experiment with different volumes of the liquids in a warmer room is repeated, it is observed that in all such cases the liquid eventually disappears and the time taken for complete evaporation in each case was different. The possible reason is/are

A. All of the above

B. the temperature is different

C. the amount of the liquids is different

D. he nature of the liquids is different

5. A small amount of acetone is taken in a watch glass and it is kept open in atmosphere. Which statement is correct for the given experiment?

A. The rate of condensation from vapour to liquid state is much less than the rate of evaporation

B. The rate of condensation from vapour to liquid state is equal or less than the rate of evaporation.

C. The rate of condensation from vapour to liquid state is equal to the rate of evaporation

D. None of these

6. Reaction is said to be in equilibrium when

A. the rate of transformation of reactants to products is equal to the rate of transformation of products to the reactants.

B. 50% of the reactants are converted to products

C. the volume of reactants is just equal to the volume of the products

D. the reaction is near completion and all the reactants are converted to products

7. Which of the following is not true about a reversible reaction?

A. Number of moles of reactants and products is always equal

B. It can be attained only in a closed container

C. It cannot be influenced by a catalyst

D. The reaction does not proceed to completion

8. If a system is at equilibrium, the rate of forward to the reverse reaction is

A. equal

B. less

C. high

D. at equilibrium

9. In a reversible chemical reaction having two reactants in equilibrium, if the concentration of the reactants are doubled then the equilibrium constant will

A. Remain the same

B. Be halved

C. Also be doubled

D. Become one-fourth

10. On doubling P and V with constant temperature the equilibrium constant will

A. remain constant

B. become one-fourth

C. become double

D. None of these

Page 2 of 3

11. The reaction quotient Q is used to

A. predict the direction of the reaction

B. calculate equilibrium concentrations

C. calculate equilibrium constant

D. predict the extent of a reaction on the basis of its magnitude

12. Which one of the following information can be obtained on the basis of Le Chatelier principle?

A. Shift in equilibrium position on changing value of a constraint

B. Equilibrium constant of a chemical reaction

C. Equilibrium constant of a chemical reaction

D. Dissociation constant of a weak acid

13. Suitable conditions for melting of ice

A. high temperature and high pressure

B. high temperature and low pressure

C. low temperature and low pressure

D. low temperature and high pressure

14. In an equilibrium reaction if temperature increases

A. any of the above

B. no effect

C. equilibrium constant decreases

D. equilibrium constant increases

15. What happens when an inert gas is added to an equilibrium keeping volume unchanged?

A. More products will form

B. Less product will form

C. More reactant will form

D. Equilibrium will remain unchanged

16. Which of the following is/are electrolytes?
(i) Sugar solution (ii) Sodium chloride
(iii) Acetic acid (iv) Starch solution

A. (ii) and (iii)

B. (i) and (iv)

C. (ii) and (iv)

D. (i) and (iii)

17. Which of the following statements are correct regarding Arrhenius theory of acid and base?

A. Both

B. This theory was applicable to only aqueous solutions

C. This theory was applicable to all solutions

D. None of these

18. Would gaseous HCl be considered as an Arrhenius acid ?

A. No

B. Yes

C. Not known

D. Gaseous HCl does not exist

19. A base, as defined by Bronsted theory, is a substance which can

A. accept protons

B. gain a pair of electrons

C. donate protons

D. lose a pair of electrons

20. BF₃ is an acid according to

A. Lewis Concept

B. Arrhenius concept

C. Bronsted-Lowry concept

D. None of these

Page 3 of 3

21. The solubility of Ca₃(PO₄)2 in water is y mol/L. Its solubility product is:

A. 6y²

B. 36 y⁴

C. 64 y⁵

D. 108 y⁵

22. A physician wishes to prepare a buffer solution at pH = 3.85 that efficiently resists changes in pH yet contains only small concentration of the buffering agents. Which of the following weak acids together with its sodium salt would be best to use?

A. 2, 5-Dihydroxy benzoic acid (pK_a = 2.97)

B. Acetoacetic acid (pK_a = 3.58)

C. m-Chlorobenzoic acid (pK_a = 3.98)

D. p-Chlorocinnamic acid (pK_a = 4.41)

23. Which of the following aqueous solutions will have the highest pH?

A. NaCl

B. CH₃COONa

C. Na₂CO₃

D. NH₄ Cl

24. What is the pH of a 0.10 M solution of barium hydroxide, Ba (OH)₂?

A. 11.31

B. 11.7

C. 13.30

D. None of these

25. Which of the following oxides is not expected to react with sodium hydroxide?

A. CaO

B. SiO₂

C. BeO

d. B₂O₃