Question

Match the reaction in List 1 with titration method in List 2.

Answer 1

(A) $I_2$ oxidizes $N_2{H}_4$ to $N_2$
The balanced chemical reaction is given below.
$N_2{H}_4+2I_2\to N_2+4HI$
This is iodometric titration.
(B) $2CuS{O}_4+4KI\to C{u}_2{I}_2+2K_{2}S{O}_4+I_2$
This is also iodometric titration.
The liberated iodine is titrated with standard sodium thiosulphate solution.
(C) ${Mn{O}_4}^{-}+F{e}^{2+}\to M{n}^{2+}+F{e}^{3+}$
This is a redox reaction.
Manganese is reduced and iron is oxidized.
(D) $N{H}_{4}Cl+NaOH\stackrel{\Delta }{\to }N{H}_3$
$2N{H}_3+H_{2}S{O}_4\to (N{H}_4{)}_{2}S{O}_4$
This is the Kjeldahl method for the quantitative determination of nitrogen.
Other method used is Dumas method.
Hence, the correct match is $A\to 1,B\to 1,C\to 2,D\to 3$.