A solution reacts with crushed egg-shells to give a gas that turns limewater milky.
The solution contains
(a) NaCl (b) HCl (c) LiCl (d) KCl
Egg Shells are made of CaCO 3 (Calcium Carbonate). CO 2 is the gas which turns lime water milky. Hence, one of the reactants is CaCO 3 and one of the products is CO 2 .
We know that CO 2 is produced when Metal Carbonates react with Acid.
Hence, the reaction would be:
Acid + Metal Carbonate → Salt + Carbon Dioxide + Water
2HCl(aq) + CaCO 3 (s) → CaCl 2 (aq)+ H 2 O(l) + CO 2 (g)
Hence the solution contains HCl and option b is correct.