Question

The gas that turns lime water milky is 

(a) CO₂

(b) SO₂

(c) Both of these 

(d) None of these

Answer 1

Correct option is (a) CO₂

When carbon dioxide is bubbled through lime water (which is a solution of calcium hydroxide, Ca(OH)₂), it reacts to form calcium carbonate (CaCO₃), which is insoluble in water and appears as a white precipitate, making the lime water look milky.