Question

A solution reacts with marble chips to produce a gas which turns lime water milky. The solution contains:
(a) Na₂SO₄
(b) CaSO₄
(c) H₂SO₄
(d) K₂SO₄

Answer 1

H₂SO₄
Marble chips contain calcium carbonate (CaCO₃), which reacts with sulphuric acid (H₂SO₄) to form carbon dioxide gas (CO₂). Carbon dioxide gas, when passed through lime water [Ca(OH)₂], turns it milky.