What substances need to be removed before air is liquefied during fractional distillation?

Dust and spores

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$C O_{2}$ and water vapour

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$C O_{2}$ and bacteria

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$C O_{2}$ and $O_{3}$

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Solution

The correct option is B
$C O_{2}$ and water vapour

$C O_{2}$ and water vapour

Before air is liquefied, water vapor and carbon dioxide are removed, because these substances solidify when cooled and would clog the pipes of the air liquefaction plant.

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What instrument is used during fractional distillation to remove water vapour which condenses at -200 C?

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