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 1

Answer: (B)

The correct option is B $HCl$
Crushed egg shell has composition $CaC{O}_3$ reacts with acid and gives gas $C{O}_2$ which turns lime water $\left(Ca\right(OH{)}_2)$ milky by producing $CaC{O}_3$ again. The acid in given options is $HCl$.

$CaC{O}_3+2HCl\to CaC{l}_2+C{O}_2+H_{2}O$

$Ca(OH{)}_2+C{O}_2\to CaC{O}_3+H_{2}O$