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



(b) HCl



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:

Reaction of Acid with Metal Carbonate - Teachoo.jpg

Hence the solution contains HCl and option b is correct.

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CA Maninder Singh is a Chartered Accountant for the past 14 years and a teacher from the past 18 years. He teaches Science, Economics, Accounting and English at Teachoo