In the chemical equilibrium of a reversible reaction,which of the following does not cause any change?

If a system is at equilibrium,the rate of the forward reaction compared to the reverse reaction 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?

Which of the following statements is not correct about the equilibrium constant $K_c$?

The equilibrium of the reaction $x \rightleftharpoons y$ is attained when......

Explain solid-liquid equilibrium by giving an example.