Select (i) combination reaction (ii) decomposition reaction (iii) displacement reaction and (iv) double displacement reaction from the following chemical equations:
i. ZnCO3(s) → ZnO(s) + CO2(g)
ii. Pb(s) + CuCl2(aq) → PbCl2(aq) + Cu(s)
iii. NaBr(aq) + AgNO3(aq) → AgBr(s) + NaNO3(aq)
iv. H2(g) + Cl2(g) → 2HCl(g)
v. Fe2O3(s) + 2Al(s) → Al2O3(s) + 2Fe(l)
vi. 3H2(g) + N2(g) → 2NH3(g)