Question

Which is distilled first
A. Liquid CO₂
B. Liquid N₂
C. Liquid O₂
D. Liquid H₂

Answer 1

Hint: The process in which compounds are separated by boiling the mixture of the solution so that the compounds which vapourize at different temperatures are then condensed to get nearly pure compounds. Distillation is based on the boiling point and volatility of the components. Boiling point of a liquid is the temperature of the liquid at which the vapour pressure of liquid is equal to atmospheric pressure.

Complete Step by Step Answer:
Distillation is based on volatility; volatility is a property of the substance which shows how fast a compound can vapourize The compounds whose boiling point is low will vapourize earlier and then first condensed to get pure compounds and the compounds whose boiling point is high will vapourize in the end and then condensed to their pure form. Distillation is an important process that is used for the separation of the mixture. We mostly use fractional distillation for the separation of a mixture of liquid.

Now as we know that the boiling point of is ${\mathrm{CO}}_2 -78.46°C$, the boiling point of is
$\mathrm{N}_2 -195.8°C$, the boiling point of $\mathrm{O}_2 is -183°C$ and the boiling point of $\mathrm{H}_2 is -252°C$.

The decrease in boiling point is:
${\mathrm{CO}}_2$ (-78.46°C) > $\mathrm{O}_2$ (-183°C) > $\mathrm{N}_2$ (-195.8°C) > $\mathrm{H}_2 (-252°C)$
So first the
$\mathrm{H}_2$ will be distilled then $\mathrm{N}_2$, then $\mathrm{O}_2$, and at last ${\mathrm{CO}}_2$.
Thus, Option (D) is correct

Note: To store all the above gases in liquid form we need very low temperature as we can see their boiling points are very low. Distillation is a very common process that is used in industries and laboratories. It is also used in food processing.