Question

a solution reacts with crushed egg shells to give a gas thhat turns lime water millkythe soluttion contains-

a.NaCl

b.HCl

c.FeCl3

d.KCl

Answer 1

The solution 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

Answer 2

ANSWER :

HCl

Lime water turns milky and hence the gas is carbon-dioxide.

We already know that egg shells contain calcium carbonate .

Hence the only thing that can displace is HCl .

Thus the answer is HCl as only an acid can perform the above reaction and displace the calcium carbonate to liberate an acidic gas.

Reaction :

CaCO₃ + 2HCl => CaCl₂ + H₂O + CO₂

CO₂ + Ca(OH)₂=>CaCO₃ + H₂O