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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 $\ce{\left( K_2SO_4\right)}$ is formed from a strong acid, sulphuric acid $\ce{\left( H_2SO_4\right)}$, and a strong base, potassium hydroxide $\ce{(KOH)}$. On dissolving in water, $\ce{K_2SO_4}$ hydrolyses to form equal amounts of $H ^{+}$and $OH ^{-}$ions. As the salt solution of $\ce{K_2SO_4}$ is neutral, it has no effect on red or blue litmus paper.

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