Factors Affecting Chemical Equilibrium worksheet

There are various factors affecting chemical Equilibrium.

Some of them are listed below:-

1. Concentration:

By increasing or decreasing the concentration of either reactants or products, the reaction can be manipulated in the desire direction.

2. Pressure

3. Temperature

4. Effect of Catalyst

Here, you can find some questions based on Factors Affecting chemical equilibrium and their answers:



1. A vessel at equilibrium, contains SO_3, SO_2 \text{and} O_2. Now some helium gas is added, so that total pressure increases while temperature and volume remain constant. According to Le-Chate1ier’s principle, the dissociation of SO_3

(a)    Decreases

(b)   Remains unaltered

(c)    Increases

(d)   Changes unpredictably


2. In a reversible reaction, the catalyst:

(a)    Decreases activation energy of forward reaction

(b)   Increases activation energy of forward reaction

(c)    Decreases activation energy of both forward and backward reactions

(d)   Increases activation energy of backward reaction


3. The chemical equilibrium of a reversible reaction is not influenced by:

(a)    Temperature

(b)   Pressure

(c)    Catalyst

(d)   Concentration


4. The reaction: PCl_5 (g) \leftrightharpoons PCI_3 (g)+Cl2(g) is in equilibrium. If the equilibrium concentration of PCl_3 (g)  is doubled then concentration would become:

(a)    1/2 of its initial value

(b)   1/4 of its initial value

(c)    Four times of its initial value

(d)   Two times of its initial value


5. Which of the following reactions will be favoured at low pressure?

(a)    N_2 + 3H_2 \leftrightharpoons 2NH_3

(b)   H_2I_2 \leftrightharpoons 2HI

(c)    PCl_4 \leftrightharpoons 2PCl_3 + Cl_2

(d)   N_2 + O_2 \leftrightharpoons 2NO


6. For equilibrium reaction: 2NO_2 (g) \leftrightharpoons N_2O_4 (g) 14. 6 J, increase in temperature would:

(a)    Favour the formation of N_2O_4

(b)   Stop reaction

(c)    Favour the decomposition of N_2O_4

(d)   Not alter the equilibrium


7. In the reaction: H_2 + H_2 \leftrightharpoons 2HI at equilibrium, some I_2 is added. What happens to the equilibrium?

(a)    It gets shifted to the right

(b)   It remains unchanged

(c)    It gets shifted to the left

(d)   First (b), then (c)


8. Which of the following changes will shift the reaction in forward direction? I_2 (g) \leftrightharpoons 2I(g) Take \Delta H^0 = + 150

(a)    Increase in concentration of

(b)   Increase in total

(c)    Decrease in concentration of I_2

(d)   Increase in temperature


9. Which of the following equilibria, in gaseous phase, would be unaffected by an increase in pressure?

(a)    N_2 + 3H_2 \leftrightharpoons 2NH_3

(b)   N_2 + O_2 \leftrightharpoons 2NO

(c)    N_2O_4 \leftrightharpoons 2NO_2

(d)   CO + 1/2 O_2 \leftrightharpoons CO_2


1.(b)     2. (c)     3. (c)     4. (a)     5. (c)

6. (c)     7. (a)     8. (d)     9. (b)

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