The role of a catalyst in a reversible reaction is to

The $\%$ yield of ammonia as a function of time in the reaction $N_{2(g)} + 3H_{2(g)} \rightleftharpoons 2NH_{3(g)}$,$\Delta H < 0$ at $(P, T_1)$ is given below. If this reaction is conducted at $(P, T_2)$,with $T_2 > T_1$,the $\%$ yield of ammonia as a function of time is represented by:

In a reversible reaction,$K_c > K_p$ and $\Delta H = +40 \, kcal$. The formation of product will be less at:

Change in volume of the system does not alter the number of moles in which of the following equilibrium?

In which of the following gaseous equilibrium will an increase in pressure increase the yield of the products?

Under which conditions of temperature and pressure is the dissociation of molecular hydrogen into atomic hydrogen favored?