Question

A solution of _______ when reacts with crushed egg-shells, gives a gas that turns lime-water milky.

• A. $NaCl$
• B. $HCl$
• C. $LiCl$
• D. $KCl$

Answer 1

The correct option is B

$HCl$

Egg shells are composed of calcium carbonate ${(CaCO}_3)$.
Acids react with metal carbonates to produce salt, water and carbon dioxide gas. The gas produced turns lime water milky.
Among the given options only $HCl$ is an acid which reacts with egg shells (a metal carbonate) to release ${CO}_2$ gas.
Hence, b option is correct.