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High purity oxygen in used in which of the mentioned cases?

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High purity oxygen in used in which of the mentioned cases?

(a) Combustion

(b) Medical purposes

(c) Chemical reactions

(d) Oxidation processes

I had been asked this question at a job interview.

The doubt is from Inorganic Chemicals in section Chemical Industries of Chemical Technology

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The correct answer is (b) Medical purposes

For explanation I would say: Medical purposes need 100% pure oxygen for respiration whereas the mentioned options take up the available free oxygen.

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