Select (i) combination reactions (ii) decomposition reactions and displacement reactions from the following
(i) `ZnCO_(3)(s) to ZnO(s) + CO_(2)(g)`
(ii) `Pb(s) + CuCl_(2)(aq) to PbCl_(2)(g) + Cu(s)`
(iii) `H_(2)(g) + Cl_(2)(g) to 2HCl(g)`
(iv) `Fe_(2)O_(3)(s) + 2Al(s) to Al_(2)O_(3)(s) + 2Fe(s)`
(v) `3H_(2)(g) + N_(2)(g) to 2NH_(3)(g)`
(vi) `CaCO_(3)(g) overset("heat")to CaCO_(3)(g) + CO_(2)(g)`

Explanation

`{:((i),"Decomposition reaction", (ii), "Displacement reaction"),((iii), "Combination reaction", (iv), "Displacemenreaction"),((v), "Combination reaction", (vi), "Decomposition reaction".):}`