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Question

A solution reacts with crushed egg-shells to give a gas that turns lime-water milky. The solution contains:
1. NaCl
2. HCl
3. LiCl
4. KCl

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Solution

The eggshells contain CaCO3 which on reacting with HCl solution gives out a gas that turns lime-water milky.
The reaction can be represented as: CaCO3(s)+2HCl(aq)CaCl2(aq)+H2O(l)+CO2

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