Air can be distilled fractionally because the constituents of the air
Correct answer: B. have different boiling points
- A. can be liquefied
- B. have different boiling points
- C. are gases at room temperature
- D. have different densities
Explanation
Fractional distillation is a separation technique based on differences in boiling points of components in a mixture. In the case of air, it is a mixture of various gases, including nitrogen, oxygen, argon, and trace amounts of other gases. These components have different boiling points, and fractional distillation can be used to separate them.As air is cooled and then gradually heated, the different gases will condense and vaporize at their respective temperatures. By collecting the fractions at different temperature ranges, each gas can be separated based on its boiling point. Therefore, option (b) "have different boiling points" is the correct reason for the ability to fractionally distill air.
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