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Q: In industrial towns, stones are preserved by the application of which solution?
  • A. Baryta
  • B. CaCl₂
  • C. H₂SO₄
  • D. Caustic alkalis
Correct Answer: Option A - Baryta solution (Barium hydrate)– When baryta solution is applied over the stone surface barium hydroxide reacts with calcium sulphate present in stones and forms barium sulphate. Ba(OH)₂ + CaSO₄ → BaSO₄ + Ca(OH)₂ The barium sulphate formed is insoluble and is least affected by atmospheric agencies.
A. Baryta solution (Barium hydrate)– When baryta solution is applied over the stone surface barium hydroxide reacts with calcium sulphate present in stones and forms barium sulphate. Ba(OH)₂ + CaSO₄ → BaSO₄ + Ca(OH)₂ The barium sulphate formed is insoluble and is least affected by atmospheric agencies.

Explanations:

Baryta solution (Barium hydrate)– When baryta solution is applied over the stone surface barium hydroxide reacts with calcium sulphate present in stones and forms barium sulphate. Ba(OH)₂ + CaSO₄ → BaSO₄ + Ca(OH)₂ The barium sulphate formed is insoluble and is least affected by atmospheric agencies.