Question

when liquid air is heated then out of argon, nitrogen and oxygen

a) nitrogen evaporates first then argon

b) oxygen evaporates first then argon

c) argon evaporates first then oxygen

d) nitrogen evaporates first then oxygen
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Answer 1

Explanation:

Liquid air is used commercially for freezing other substances and especially as an intermediate step in the production of nitrogen, oxygen, and argon and the other inert gases. As the temperature of liquid air rises, the nitrogen evaporates first at −195.8°C, the argon next at −185.7°C, and the oxygen last at −183°C.

Answer 2

a

Explanation:

nitrogen evaporates first then argan