2018 IMAT Q51 Questions

When nitrogen and hydrogen are mixed under suitable conditions of temperature and pressure, and in the presence of a catalyst, an equilibrium state is attained:

N_2(g) + 3H_2(g) ⇌ 2NH_3(g) ΔH is negative

Which of the following statements explain(s) why, when the pressure on a mixture of nitrogen and hydrogen is increased while the temperature remains constant, the time taken to attain equilibrium is decreased?

The molecules have a higher collision frequency.
The yield of ammonia (NH_3(g)) decreases.
A greater proportion of molecules in the mixture have energy greater than the activation energy.

A. 2 only
B. 3 only
C. 1 and 3 only
D. 1, 2 and 3
E. 1 only


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