JEE Main 2007 — Ionic Equilibrium Question with Solution

${\left({\mathrm{NH}}_4\right)}_2{\mathrm{SO}}_4$ is a salt of strong acid and weak base, on hydrolysis it ill produce ${\mathrm{H}}^{+}$ion. This will increase the acidity of soil. $\begin{aligned} & \left(\mathrm{NH}_4\right)_2 \mathrm{SO}_4 \longrightarrow 2 \mathrm{NH}_4^{+}+\mathrm{SO}_4^{2-} \\ & \mathrm{NH}_4^{+}+\mathrm{H}_2 \mathrm{O} \rightleftharpoons \mathrm{NH}_4 \mathrm{OH}+\mathrm{H}^{+} \end{aligned}$ Hence, (D) is correct answer.