Question

In a vessel containing $S{O}_3,S{O}_2$ and $O_2$ at equilibrium, some helium gas is introduced so that the total pressure increases while temperature and volume remain constant. According to Le Chatelier's principle, the dissociation of $S{O}_3$:

• A. increases
• B. decreases
• C. remains unaltered
• D. changes unpredictably

Answer 1

The correct option is C remains unaltered

According to Le Chatelier's principle, the dissociation of $S{O}_3$ remains unaltered.

Addition of inert gas at constant volume does not influence the equilibrium concentration. This is because the addition of a non-reactive gas does not change the partial pressures of the other gases in the container. While it is true that the total pressure of the system increases, the total pressure does not have any effect on the equilibrium constant.