Question

Select the correct statements about the following reaction:
$N_2\left(g\right)+3H_2\left(g\right)\rightleftharpoons 2N{H}_3\left(g\right);\Delta H=-22.4kcalmo{l}^{-1}$

• A. Increase in pressure will favour forward reaction
• B. Addition of inert gas forms more $N{H}_3$
• C. At low temperature, there is forward shill
• D. Catalyst will increase the amount of $N{H}_3$

Answer 1

Answer: (A)

Increase in pressure will favour forward reaction

$N_2\left(g\right)+3H_2\left(g\right)\rightleftharpoons 2N{H}_3\left(g\right);\Delta H=-22.4kcalmo{l}^{-1}$
According to lechatliers principle the reaction is carried in the direction where the volume is decreased when the pressure increased.
So in the above reaction 4 volumes of reactants formed 2 volumes of product in the forward direction.So forward reaction is favored.
Hence option A is correct.