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Asked: January 29, 20252025-01-29T13:32:27+00:00 2025-01-29T13:32:27+00:00In: Railway NTPC

A solution reacts with chalk powder to give a gas that turns lime-water milky. The solution contains:

A) HCl

B) NaOH

C) NaCl

D) H₂SO₄

Answer: A) HCl

Explanation: Hydrochloric acid (HCl) reacts with chalk (calcium carbonate) to produce carbon dioxide gas, which turns lime-water milky.