The percentage of oxygen in the air is:

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78%

0.03%

21%

80%

answer is C.

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Detailed Solution

Concept- Air is a mixture of gasses. Each gas is present in a fixed amount.
Twenty-one percent of the atmosphere is made up of oxygen. It contains a lot of small dust particles called aerosols in addition to air. Large amounts of these particles in the air are referred to as air pollution, which causes soot to develop in the atmosphere.
The majority of the atmospheric gasses are made up of nitrogen gas, with the remaining gasses making up less than 1% of the atmosphere. Oxygen is the second-most common gas in the atmosphere.
Hence, option 3 is the correct answer.

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