Match the following.

In the combination reaction, two reactants combine to form 1 product. $\mathrm{Mg}+\mathrm{N}_2 \longrightarrow \mathrm{Mg}_3 \mathrm{~N}_2$ So, A of list-I matches with (iii) of list-II. In the decomposition reaction, one reactant decomposes into multiple products. $\mathrm{KClO}_3 \longrightarrow \mathrm{KCl}+\mathrm{O}_2$ So, B of list I matches with (iv) of list II. A disproportionation reaction is a redox reaction in which one species undergoes both oxidation and reduction. $\mathrm{Cl}_2 \longrightarrow \mathrm{Cl}^{-}+\mathrm{ClO}_3^{-}$ So, C of list I matches with (ii) of list II. When components of two ionic compounds are swapped, two new compounds are formed. This is double displacement reaction. $\mathrm{AgNO}_3+\mathrm{CaCl}_2 \longrightarrow \mathrm{CaNO}_3+\mathrm{AgCl}_2$ So, D of list I matches with (i) of list II. Hence the correct match is A-(iii), B-(iv), C-(ii), D-(i)