Multiple choice

Which of the following facts justifies the given characteristic of air? “The composition of air is variable”.

  1. Air on plains contains more amount of oxygen as compared to air at very high altitudes.

  2. The element oxygen supports burning. Oxygen present in the air support burning too.

  3. Nitrogen and oxygen can be separated by boiling and condensing the liquid air.

  4. Molecule of carbon dioxide can turn lime water milky.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Oxygen is abundant in the plains as compared to high altitudes.

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