When pressure is applied to the system $Ice \rightleftharpoons Water$,what will happen?

The yellow solution of $Na_2CrO_4$ changes to orange red on passing $CO_2$ gas due to the formation of:

The following reaction is known to occur in the body $CO_2 + H_2O \rightleftharpoons H_2CO_3 \rightleftharpoons H^{+} + HCO_3^-$. If $CO_2$ escapes from the system:

The equilibrium $SO_2Cl_{2(g)} \rightleftharpoons SO_{2(g)} + Cl_{2(g)}$ is attained at $25 \ ^oC$ in a closed container and inert gas helium is introduced at constant volume. Which of the following statements are not correct?
$(a)$ Concentrations of $SO_2, Cl_2$ and $SO_2Cl_2$ change
$(b)$ More chlorine is formed
$(c)$ Concentration of $SO_2$ is reduced
$(d)$ More $SO_2Cl_2$ is formed

Write the effect of concentration change on equilibrium and explain it with a suitable example.

The colour of $CrO_4^{2-}(aq.)$ is not changed by: