Make correct pairs from below mentioned (X) and (Y).

(a – 2)

Sulphuric acid is a strong dehydrating agent.

i. It means sulphuric acid has a property to remove water from any substance.

ii. For example: If sulphuric acid falls on sugar, paper, wood etc., it removes water from it and burns it.

iii. Hence, utmost care is taken while using it.

(b – 4)

Sulphur is used in the preparation of fire crackers.

(c – 1)

Sulphur is used in the bleaching of wooden pulp in the paper industry. Thus, it is a weak bleaching agent.

(d – 3)

Dihydrogen (H₂) gas is much lighter than air and also lighter than all other gases. So, it is the lightest gas among all.