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Why does fractional distillation work?

Describe steps in fractional distillation of air.

Why are the pollutants, water vapour and carbon dioxide removed from fractional distillation?

At what temperature during fractional distillation are helium and neon removed?

How is air finally separated during fractional distillation?

In what order do the gases boil off?

What are the uses of oxygen?

What are the uses of nitrogen?

Where do most pollutants come from?

Name the common pollutants.