Question

Pure ammonia is placed in a vessel at a temperature where its dissociation constant ($\alpha$) is appreciable. At equilibrium

• A. $K_p$ does not change with pressure.
• B. $K_p$ does change with pressure
• C. concentration of $N{H}_3$ does not change with pressure.
• D. Concentration of hydrogen is less than of nitrogen.

Answer 1

The correct option is A $K_p$ does not change with pressure.

The equilibrium constant does not change at all with changes in concentrations, volume, pressure, presence of catalyst, etc. It changes only with changes in temperature of the system. For endothermic reaction, the value of K increases with increase in temperature and vice versa. For exothermic reaction, the value of K decreases with increase in temperature and vice versa.