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Acids, Bases and Salts — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceAcids, Bases and Salts1 Mark
MCQ
The salt which will give an acidic solution on dissolving in water is :
  • A
    $\ce{KCl}$
  • ✓
    $\mathrm{NH}_4 \mathrm{Cl}$
  • C
    $\mathrm{Na}_2 \mathrm{CO}$
  • D
    $\mathrm{CH}_3 \mathrm{COONa}$
✓

Answer

Correct option: B.
$\mathrm{NH}_4 \mathrm{Cl}$
$\mathrm{NH}_4 \mathrm{Cl}$ is formed with a weak base, ammonium hydroxide $\left(\mathrm{NH}_4 \mathrm{OH}\right)$, and a strong acid, hydrochloric acid $(\mathrm{HCl})$.
On dissolving in water, $\mathrm{NH}_4 \mathrm{Cl}$ hydrolyses to form more $\mathrm{H}^{+}$ions than $\mathrm{OH}^{-}$ions. Thus, it is acidic with a $pH$ less than $7 .$

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