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Question -

A solution reacts with crushed egg-shells to give a gas that turns lime-water milky. The solution contains:-   a) NaCl (b) HCl (c) LiCl (d) KCl



Answer -

Answer is HCl.
Egg shells contains calcium carbonate, which on reaction with HCl liberates CO2 gas which turn lime water to milky.

CaCO3 + 2HCl → CaCl2 + H2O + CO2

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