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In automobile exhaust, which of the following are considered harmful pollutants? (i) N2 (ii) CO (iii) CH4 (iv) Oxides of nitrogen

1. (ii) and (iii)
2. (i) and (ii)
3. (ii) and (iv)
4. (i) and (iii)

Correct answer: (ii) and (iv)

Solution

Carbon monoxide (CO) and oxides of nitrogen are harmful pollutants found in automobile exhaust, as they contribute to air pollution and can have serious health effects. In contrast, nitrogen (N2) is a non-toxic gas that makes up a large portion of the atmosphere, and methane (CH4) is not a direct product of combustion in typical vehicle exhaust.

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