Pure ammonia is placed in a vessel at a temperature where its dissociation constant $(\alpha)$ is appreciable. At equilibrium,

Among the following,the correct statement about the chemical equilibrium is

$A$ liquid is in equilibrium with its vapour in a sealed container at a fixed temperature. The volume of the container is suddenly increased.
$(a)$ What is the initial effect of the change on vapour pressure?
$(b)$ How do rates of evaporation and condensation change initially?
$(c)$ What happens when equilibrium is restored finally and what will be the final vapour pressure?

In a chemical reaction,equilibrium is established only when...

Which statement for the equilibrium constant is true for the reaction $A + B \rightleftharpoons C$?

In the given reaction $N_2 + O_2 \rightleftharpoons 2NO$,equilibrium means that