Which of the following is true about air?

Air is a mixture of several gases.

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Air exerts pressure.

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Composition of air is uniform.

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Air has mass.

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Solution

The correct option is D Air has mass.
Air is a mixture of many gases, water vapour and dust particles. It has mass and can exert pressure.
The composition of air is not uniform and changes from place to place. Polluted air contains higher percentage of gas like carbon dioxide as compared to less polluted areas.

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Which of the following is true about properties of air?

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