Select (i) combination reaction, (ii) decomposition reaction and (iii) displacement reaction from the following chemical equations :
(i) ${\mathrm{ZnCO}}_3$ (s) $\to \mathrm{ZnO}\left(\mathrm{}\mathit{s}\right)+{\mathrm{CO}}_2$ (g)
(ii) $\mathrm{Pb}$ (s) $+{\mathrm{CuCl}}_2$ (aq) $\to {\mathrm{PbCl}}_2$ (aq) $+\mathrm{Cu}$ (s)
(iii) $\mathrm{NaBr}\left(\mathrm{aq}\right)+{\mathrm{AgNO}}_3$ (aq) $\to \mathrm{AgBr}($ s)
$+{\mathrm{NaNO}}_3\left(\mathrm{aq}\right)$
(iv) ${\mathrm{H}}_2$ (g) $+{\mathrm{Cl}}_2$ (g) $\to 2\mathrm{HCl}$ (g)
(v) ${\mathrm{Fe}}_2{\mathrm{O}}_3+2\mathrm{Al}\to {\mathrm{Al}}_2{\mathrm{O}}_3+2\mathrm{Fe}$
(vi) $3{\mathrm{H}}_2\left(\mathrm{g}\right)+{\mathrm{N}}_2\left(\mathrm{g}\right)\to 2{\mathrm{NH}}_3\left(\mathrm{g}\right)$
(vii) ${\mathrm{CaCO}}_3$ (s) (s) $+{\mathrm{CO}}_2$ (g)