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How much percentage of oxygen is present in High purity oxygen?

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How much percentage of oxygen is present in High purity oxygen?

(a) 90.5

(b) 93.5

(c) 95.5

(d) 99.5

The question was posed to me in an interview for internship.

Query is from Inorganic Chemical topic in division Inorganic Chemical Industries of Chemical Technology

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Correct option is (d) 99.5

To explain I would say: The composition of high purity oxygen is 99.5% O2 and 0.5% Ar.

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