Question

For the Haber process at equilibrium:$N_2+3H_2\rightleftharpoons 2N{H}_3+$heat, which of the following statements concerning the reaction rate is/are true?
I. The reaction to the right will increase when pressure is increased.
II. The reaction to the right will decrease when the temperature is increased.
III. The reaction to the right will decrease when $N{H}_3$ is removed from the chamber.

• A. I only
• B. II only
• C. I and II only
• D. II and III only
• E. I, II and III

Answer 1

Answer: (C)

I and II only

The given reaction is:-

$N_2+3H_2\rightleftharpoons 2{NH}_3+heat$

$\left(I\right)$ When pressure is increased at equilibrium then the reaction will proceed to the right. Since the no. of moles of gaseous reactants is greater in reactants, so, by Le Chatelier's principle, increase in pressure will shift the reaction to shift forward right to compensate the same.

$\left(II\right)$ The given reaction is exothermic, so on increasing temperature, by Le Chatelier's principle, the reaction will shift leftwards to compensate the increase. So, the reaction towards the right is decreased.