Question

For the following equilibrium
$N{H}_{4}HS\left(s\right)\rightleftharpoons N{H}_3\left(g\right)+H_{2}S\left(g\right)$ reaction is endothermic reaction. Partial pressure of $N{H}_3$ will increase:

• A. if $N{H}_3$ is added after equilibrium is established
• B. if $H_{2}S$ is added after equilibrium is established
• C. temperature is increased
• D. volume of the flask is increased

Answer 1

Answer: (A), (C)

if $N{H}_3$ is added after equilibrium is established
temperature is increased

When ammonia is added after equilibrium is established, the partial pressure of ammonia will increase.When the temperature of an endothermic reaction is increased, the equilibrium will shift in the forward direction so that the heat is absorbed which will nullify the effect of increased temperature. Hence, the partial pressure of ammonia will increase.When the volume of the flask is increased, the pressure will decrease.