Multiple choice

Which of the following facts justifies the given characteristics of air? � The components retain their original properties�

  1. Amount of water vapors in air is higher in monsoon than that in the summer.

  2. Oxygen element support burning. Oxygen present in air support burning too.

  3. There is no release or absorption of energy a sample of air is prepared.

  4. Nitrogen and oxygen can be separated by boiling and condensing the liquid air.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In a mixture, each component keeps its original chemical properties. Oxygen alone supports burning, and oxygen in air also supports burning because it remains oxygen even when mixed with nitrogen and other gases. This demonstrates that mixture components behave as they would individually. Option A shows composition variability, not property retention.

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