Question

Which of the following gases turns lime water milky? 

(A) CO  

(B) CO₂ 

(C) SO₂ 

(D) Cl₂

Answer 1

Correct option is (B) CO₂ 

Carbon dioxide (\(CO_2\)) turns lime water milky, due to the formation of \(CaCO_3\) (calcium carbonate).

\(Ca(OH)_2 + CO_2 \rightarrow CaCO_3 + H_2O\)

Answer 2

Correct option is (B) CO₂ 

Carbon dioxide (CO₂) gas turns lime water milky.

CO₂ + Ca(OH)₂ → CaCO₃ (Milky calcium carbonate)

When SO₂ reacts with slaked lime, it also turns into milky.

SO₂ + Ca(OH)2 → CaSO4 (Milky calcium sulphate)