Chemistry 2005 JAMB Past Questions - Question 47: The property used in the industrial preparation of nitrogen and oxygen from air is

Correct Answer

C

Explanation

The property used in the industrial preparation of nitrogen and oxygen from air is boiling point. This is because nitrogen and oxygen have different boiling points, allowing for a process known as fractional distillation to separate them from air.
In air separation plants, the air is first compressed and then cooled to liquefy it. The liquid air is then subject to fractional distillation, a process that takes advantage of the different boiling points of its components. Nitrogen boils at a slightly higher temperature than oxygen, so by carefully controlling the temperature of the distillation column, nitrogen and oxygen can be separated and collected in their pure forms.