Question

Assertion : Both chlorine and sulphur dioxide act as bleaching agents. 

Reason : Chlorine bleaches by vigorous oxidation, while sulphur dioxide bleaches by mild reduction.

(a) Both A and R are true and R is the correct explanation of A

(b) Both A and R are true but R is not correct explanation of A

(c) A is true but R is false

(d) A and R are false

Answer 1

The correct option is (a) Both A and R are true and R is the correct explanation of A.

Explanation:

SO₂ in presence of moisture acts as a bleaching agent. This is due to the reducing nature of SO₂. But bleaching action is only temporary. 

SO₂ + 2H₂O --> H₂SO₄ + 2[H] 

Similarily, Cl₂ in presence of moisture give out nascent oxygen and causes bleaching. 

Cl₂ + H₂O ---> 2HCl + [O] 

here bleaching action is permanent.