Chemical equilibrium mcq B.Sc. SY sem.III

B.Sc. Second year Undergraduate degree course

Semester Third

Physical Chemistry

Chapter – Chemical equilibrium

Multiple Choice questions

1. A chemical system is at equilibrium -------
a) When the rates of the forward reaction and the reverse reaction are equal.
b) When the rate of the forward reaction becomes zero.
c) When all of the reactants have been used up.
d) When the rate of the forward reaction and the reverse reaction are both zero.

2. The Clausius - Clapeyron equation helps to calculate ----
a) Latent heat of vaporization
b) Boiling point or freezing point
c) Vapor pressure at one temperature, if at another temperature is given.
d) All of the above

3. At equilibrium the change in free energy of the reaction is -----
a) AG = 0
b) AG = 1
c) AG> 0
d) AG <1

4.The equation

a) vant Hoff isochore
b) clapeyren equation
c) Gibb's equation
d) Gibb's Duhem equation

5. A process is in equilibrium state when
a) ΔG>0
b) ΔG = 0
c) ΔG = 1
d) ΔG =2

6. Equilibrium reactions are characterized by
a) Going to completion
b) Being non spontaneous
c) The presence of both reactant and product in definite proportion
d) None of these.

7. At the boiling point of liquid which pair is in equillibrium?
a) Liquid Vapor
b) Solid Liquid
c) Solid Vapor
d) Liquid Liquid

8. The free energy function (G) is defined as
a) G = H + TS
b) G = H - TS
c) G = TS - H
d) None of these

9. When a stress is applied on a system in equilibrium, the system tends to adjust itself so as to reduce the stress is a statement of.
a) Le Chatalier's principle
b) Law of mass action
c) Hess's law
d) None of these.

10. A dynamic equilibrium
a) is when the rate of the forward reaction is equal to the rate of the reverse reaction
b) is a form of static equilibrium
c) only occurs in chemical equilibrium
d) involves radioactivity

11. Which of the following represent equilibrium constants?
a) weak acid or weak base dissociation constant
b) Kc for a reaction
c) concentration of a strong acid in water
d) (a) and (b) represent equilibrium constants

12. If the equilibrium constant for a reaction is large, what can be said about the reaction?
a) Very little product is formed
b) Very little reactant remains at equilibrium
c) The reaction goes to completion
d) Large quantities of reactants will remain at equilibrium

13. Which of the following can change the value of the equilibrium constant for a reaction
a) Changing the concentration of the reactants
b) Adding a catalyst
c) Changing the solvent

d) Removing the products as they are formed

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