Question

N2(g) + 3H2(g) <=> 2NH3(g) If volume of container increase by 2 time, How much time degree of dissociation will change:-

• A. Increase
• B. Decrease
• C. No change
• D. Cannot be determined

Answer 1

Answer: (B)

Decrease

Answer 2

The reaction N2(g) + 3H2(g) <=> 2NH3(g) involves a decrease in the number of moles of gas ($\Delta n_g = 2 - (1+3) = -2$). According to Le Chatelier's principle, increasing the volume of the container (which decreases pressure) shifts the equilibrium towards the side with a greater number of moles of gas. In this case, the equilibrium shifts towards the reactants. A shift towards reactants means the forward reaction (dissociation of N2 and H2 to form NH3) is less favored, and thus the degree of dissociation decreases.