Give a balanced equation for thermal dissociation of

(i) a gas

(ii) a solid [both containing the chloride ion].

(i) $2\text{HCl} \xrightleftharpoons{\gt 500 \degree\text{C}} \text{H}$\text{2} + \text{Cl}\text{2}

(ii) $\text{NH}$4\text{Cl} \xrightarrow{\Delta} \text{NH}3 + \text{HCl}