Which is true about the process of fractional distillation of liquid air?
a. Compressed air is a by-product.
b. It produces pure liquid oxygen.
c. Liquid nitrous oxide is produced.
d. Concentrators use it to produce oxygen.
ANS: B
The fractional distillation of liquid air creates pure liquid oxygen. There are no by-products from this method. Oxygen concentrators take in room air and separate oxygen from nitrogen.
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