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NDA 2025
Exam
NDA
Year
2025
Subject
General Ability
Chapter
General Science

NDA 2025 · General Ability · General Science

The reaction that occurs on passing carbon dioxide gas through lime...

The reaction that occurs on passing carbon dioxide gas through lime water is

Options

  1. ACaCO3+H2O+CO2→Ca(HCO3)2CaCO_3 + H_2O + CO_2 \rightarrow Ca(HCO_3)_2
  2. BCa(OH)2+CO2→CaCO3+H2OCa(OH)_2 + CO_2 \rightarrow CaCO_3 + H_2O
  3. CCaO+CO2→CaCO3CaO + CO_2 \rightarrow CaCO_3
  4. DCaCl2+H2O+CO2→CaCO3+2HClCaCl_2 + H_2O + CO_2 \rightarrow CaCO_3 + 2HCl

Correct answer

B. Ca(OH)2+CO2→CaCO3+H2OCa(OH)_2 + CO_2 \rightarrow CaCO_3 + H_2O

Step-by-step solution

Lime water is an aqueous solution of calcium hydroxide, Ca(OH)2Ca(OH)_2.

When carbon dioxide gas is passed through lime water, it reacts with calcium hydroxide to form a white precipitate of calcium carbonate and water.

The chemical equation for this reaction is:
Ca(OH)2+CO2→CaCO3+H2OCa(OH)_2 + CO_2 \rightarrow CaCO_3 + H_2O

Answer: Ca(OH)2+CO2→CaCO3+H2OCa(OH)_2 + CO_2 \rightarrow CaCO_3 + H_2O
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