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Liquid oxygen is produced by ____________ method.

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Liquid oxygen is produced by ____________ method.

(a) Batch distillation

(b) Steam distillation

(c) Extractive distillation

(d) Fractional distillation

The question was asked in an internship interview.

I want to ask this question from Cryogenics, Hot and Cold Working of Metals in chapter Mechanical Working Processes & Phase Transformations of Engineering Material & Metallurgy

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Right option is (d) Fractional distillation

The explanation is: Liquid oxygen (Lox) is a common cryogenic gas commonly used in aerospace and medical applications. It is formed from the oxygen in air by fractional distillation method.

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