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Question

A solution reacts with crushed eggshells to give a gas that turns lime-water milky. The solution contains

A
NaCl
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B
HCl
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C
LiCl
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D
KCl
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Solution

The correct option is B HCl
Eggshells are made up of calcium carbonate.
Metal Carbonates/ Bicarbonates + Acid → Salt + Carbon Dioxide + Water

On passing carbon dioxide gas through lime water, lime water turns milky due to the formation of a white precipitate of calcium carbonate.

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