Which of the following is not primary pollutant?

S O_{2}

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H_{2} S

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C O

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S O_{3}

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Solution

The correct option is C $H_{2} S$
Primary Pollutants are the ones which are injected into the atmosphere directly. Examples include:

Carbon monoxide (CO)
Oxides of nitrogen ( $N O_{x}, N O$ )
Sulfur oxides ( $S O_{x}$ )
Volatile organic compounds (VOCs)
Particulate matter (dust, ash, salt particles)

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S + O_{2} \to {S O}_{2}; Δ H = - 298.2 k J

{S O}_{2} + \frac{1}{2} O_{2} \to S O_{3}; Δ H = - 98.7 k J

{S O}_{3} + H_{2} O \to H_{2} {S O}_{4}; Δ H = - 130.2 k J

H_{2} + \frac{1}{2} O_{2} \to H_{2} O; Δ H = - 227.3 k J

H_{2} {S O}_{4}

The rates of diffusion of $S O_{2}, C O_{2}, P C l_{3} a n d S O_{3}$ are in the following order –

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