The reaction, $\mathrm{SO_2 + Cl_2 \rightarrow SO_2Cl_2}$ is exothermic and reversible. A mixture of SO$_2$(g), Cl$_2$(g) and SO$_2$Cl$_2$(l) is at equilibrium in a closed container. Now a certain quantity of extra SO$_2$ is introduced into the container, the volume remaining the same. Which of the following is/are true?