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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 have no effect on either red litmus or blue litmus is :
  • ✓
    Potassium sulphate.
  • B
    Sodium carbonate.
  • C
    Ammonium sulphate.
  • D
    Sodium acetate.
✓

Answer

Correct option: A.
Potassium sulphate.
Potassium sulphate $\left(\mathrm{K}_2 \mathrm{SO}_4\right)$ is formed from a strong acid, sulphuric acid $\left(\mathrm{H}_2 \mathrm{SO}_4\right)$, and a strong base, potassium hydroxide $(\mathrm{KOH})$. On dissolving in water, $\mathrm{K}_2 \mathrm{SO}_4$ hydrolyses to form equal amounts of $\mathrm{H}^{+}$and $\mathrm{OH}^{-}$ions. As the salt solution of $\mathrm{K}_2 \mathrm{SO}_4$ is neutral, it has no effect on red or blue litmus paper.

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