Q26 / 120 · JEE Main 2007 · Chemistry

Regular use of which of the following fertilizer increases the acidity of soil?

A
Potassium nitrate
B
Urea
C
Superphosphate of lime
Correct answer
D
Ammonium sulphate

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.

Hence, the correct answer is option: 'D'.

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