Which one of the following acts as secondary pollutants?

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N O_{2}

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H N O_{3}

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C l_{2}

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Solution

The correct option is B $N O_{2}$
Pollutants may be primary or secondary.
Primary pollutants are the pollutants that are directly released or emitted in the atmosphere.
Secondary pollutants are the pollutants which are formed when primary pollutants react with themselves or with other components of atmosphere.
An example of secondary pollutant is NO₂ which is formed when NO reacts with oxygen in air.
So, the correct answer is 'NO₂'.

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