Which of the following is a primary pollutant?

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HNO

_{3}

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_{2}

_{4}

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_{3}

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Solution

The correct option is B CO
A primary pollutant is an air pollutant emitted directly from a source e.g., carbon monoxide (CO), oxides of nitrogen (NOx, NO), sulfur oxides (SOx), SO $_{2}$ , volatile organic compounds (VOCs) and particulate matter (dust, ash, salt particles). They further react in the presence of sunlight to form secondary pollutants such as ozone.

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$H N O_{2} + 2 H_{2} S O_{3} + H_{2} O \to N H_{2} O H + 2 D T h e n ‘ D^{'} i s$

Complete the following equation :

$4 N O_{2} + 2 H_{2} O + O_{2} \to$ ?

nitrating mixture is obtained by mixing concentrated $H N O_{3}$ and concentrated $H_{2} S O_{4}$ . The role of the latter - $H_{2} S O_{4}$ is:

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