Question

The law of multiple proportions is illustrated by the pair of compounds: 

(A) sodium chloride and sodium bromide 

(B) water and heavy water 

(C) sulphur dioxide and sulphur trioxide 

(D) magnesium hydroxide and magnesium oxide

Answer 1

(C) sulphur dioxide and sulphur trioxide 

Explanation: 

In SO₂ 32 gram of suphur react with 32 gram of oxygen. Similarly for SO₃ fixed mass of sulphur (32 gram) react with 48 gram of oxygen. The ratio of oxygen’s mass = 32:48 = 2:3 Which support law of multiple proportions.