Multiple choice

Which of the following is/are correct regarding the statement- 'air is a mixture and not a pure substance'?

a. The amounts of gases present in air at different places varies. b. The properties of air are the properties of its constituents. c. The different gases present in air can be separated by the process of fractional distillation of liquid air.

  1. Only a

  2. Only b

  3. Only c

  4. Only a and c

  5. All of these
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This is the correct answer, as all these statements prove that air is a mixture. The amounts of gases present in air at different places varies, though only marginally. The properties of air are the properties of its constituents. Air supports combustion due to the presence of oxygen in it, it turns lime water milky due to the presence of carbon di oxide in it. The different gases present in air can be separated by the physical process of fractional distillation of liquid air.

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