Question:
A colourless gas G is produced when egg-shells are treated with a solution S. The gas G turns lime water milky. S and G respectively are:
A colourless gas G is produced when egg-shells are treated with a solution S. The gas G turns lime water milky. S and G respectively are:
Updated On: Dec 20, 2024
- \( \text{H}_2\text{SO}_4 \) and \( \text{SO}_2 \)
- \( \text{HCl} \) and \( \text{SO}_2 \)
- \( \text{NaCl} \) and \( \text{CO}_2 \)
- \( \text{HCl} \) and \( \text{CO}_2 \)
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The Correct Option is D
Solution and Explanation
Egg shells are primarily composed of calcium carbonate (\( \text{CaCO}_3 \)). When an acid reacts with calcium carbonate, it produces carbon dioxide gas (\( \text{CO}_2 \)), water, and a calcium salt. Carbon dioxide turns limewater milky (due to the formation of insoluble calcium carbonate).
The reaction is: \[ \text{CaCO}_3(s) + 2\text{HCl}(aq) \rightarrow \text{CaCl}_2(aq) + \text{H}_2\text{O}(l) + \text{CO}_2(g) \]
Therefore, the solution \( S \) is hydrochloric acid (\( \text{HCl} \)), and the gas \( G \) is carbon dioxide (\( \text{CO}_2 \)).
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