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Question 21 (Choice 1) - CBSE Class 10 Sample Paper Science Solution - For 2023 Boards - Solutions to CBSE Sample Paper - Science Class 10

Last updated at July 18, 2026 by

A clear solution of slaked lime is made by dissolving Ca(OH)2in an excess of water. This solution is left exposed to air. The solution slowly goes milky as a faint white precipitate forms. Explain why a faint white precipitate forms, support your response with the help of a chemical equation.

 

Answer:

  • Slaked lime is also known as Calcium hydroxide . 
  • When mixed in water, it produces a clear solution of Ca(OH) 2 .
  • Calcium hydroxide reacts with Carbon dioxide present in the atmosphere.
  • It forms Calcium carbonate which results in milkiness/white ppt CaCO 3 .

Reaction of Slaked Lime with CO2 - Teachoo.jpg

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