Nitrogen gas reacts with hydrogen gas according to the following equation.

\[{{\text{N}}_{\text{2}}}{\text{(g)}} + {\text{3}}{{\text{H}}_{\text{2}}}{\text{(g)}} \rightleftharpoons {\text{2N}}{{\text{H}}_{\text{3}}}{\text{(g)}}\;\;\;\;\;\Delta H =  - 92{\text{ kJ}}\]

Why is the rate of reaction slow at room temperature?

A.     The activation energy of the forward reaction is high.

B.     The activation energy of the forward reaction is low.

C.     The equilibrium constant is very small.

D.     The rate of the reverse reaction is greater than the rate of the forward reaction.

A