Burning fossil fuel releases ___________.

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NO2

CO2

Both 1 & 2

None of the above

answer is C.

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Detailed Solution

Concept: Air is a mixture of gasses. It has 79% of nitrogen and 21% of oxygen and the remaining 1% all other gasses.
On burning, the fossil fuels release large amounts of carbon dioxide, a greenhouse gas, into the air. Fossil fuels are composed of dead and decayed animals and plants. Thus, the major constituents of fossil fuels are carbon, nitrogen, and hydrogen. Carbon dioxide is the important constituent of Greenhouse gasses. The greenhouse effect is caused through gasses that absorb infrared radiation and then results in the emission of carbon dioxide. For example, carbon dioxide and chlorofluorocarbons.
Hence, option 3 is the correct answer.

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