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MolSynapse / Question bank / p-Block Elements: Groups 15 and 16 / Oxygen, ozone and oxides

JEE Main levelSingle correct optionDifficulty 2 of 3pn070

Dioxygen is manufactured industrially mainly by fractional distillation of liquid air. In this process

Aboth gases distil together and are separated by a chemical absorbent
Bdioxygen is obtained by electrolysis of the liquid air
Cdinitrogen (b.p. about 77 K) distils off first and liquid dioxygen (b.p. about 90 K) remains
Ddioxygen (b.p. about 77 K) distils off first and liquid dinitrogen remains

Answer: C

Liquid air is a mixture of

N X_{2}

(lower boiling point) and

O X_{2}

(higher boiling point). On fractional distillation the more volatile

N X_{2}

comes off first, enriching the residue in

O X_{2}

.

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