The substance which is a primary pollutant is:

H_{2} S O_{4}

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C O

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PAN

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Aldehydes

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Solution

The correct option is B $C O$
Important air pollutants are-
* Oxides of carbon $(C O, C O_{2})$
* Oxides of sulphur $(S O_{2}$ & $S O_{3})$
* Oxides of nitrogen
* Chlorofluoro carbons (CFC)
* Hydrocarbons like $C H_{4}$ .
* Photochemical and industrial smog.
* Dust & other particulate matter from industries.

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A chemical substance which is not a pollutant but becomes a pollutant on reaction with other substance is called ___________.

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