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Acids, Bases and Salts — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceAcids, Bases and Salts1 Mark
MCQ
The salt whose aqueous solution will turn blue litmus to red is :
  • ✓
    Ammonium sulphate.
  • B
    Sodium acetate.
  • C
    Sodium chloride.
  • D
    Potassium carbonate.
✓

Answer

Correct option: A.
Ammonium sulphate.
Ammonium sulphate $\left[\left(\mathrm{NH}_4\right)_2 \mathrm{SO}_4\right]$ is formed from a weak base, ammonium hydroxide $\left(\mathrm{NH}_4 \mathrm{OH}\right)$, and a strong acid, sulphuric acid $\left(\mathrm{H}_2 \mathrm{SO}_4\right)$. On dissolving in water, $\left(\mathrm{NH}_4\right)_2 \mathrm{SO}_4$ hydrolyses to form more $\mathrm{H}^{+}$ions than $\mathrm{OH}^{-}$ions. As the aqueous solution of the salt $\left(\mathrm{NH}_4\right)_2 \mathrm{SO}_4$ is acidic, it turns blue litmus red.

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