Q. Which of the following compounds is used to soften hard water?

  • (A) Sodium chloride
  • (B) Sodium carbonate
  • (C) Calcium hydroxide
  • (D) Potassium permanganate
✅ Correct Answer: (B) Sodium carbonate
Explanation: Sodium carbonate (Na2CO3) reacts with calcium and magnesium ions in hard water to form insoluble carbonates, thus softening the water.

Published by Sikhar Chaudhary ⭐ 6.79K Points at 06-Oct-2025 06:41 am in Chemistry

Explanation by: Sikhar Chaudhary
Sodium carbonate (Na2CO3) reacts with calcium and magnesium ions in hard water to form insoluble carbonates, thus softening the water.

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