Which of the following is not the main cause of low pH in acid rain?

S O_{2}

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C O_{2}

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N O

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N O_{2}

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Solution

The correct option is B $C O_{2}$
$C O_{2}$ exists naturally in the atmosphere and does not cause the pH to be lower than 5.7 which is not much harmful. The other oxides directly or after oxidation produce $H_{2} S O_{4}$ and $H N O_{3}$ and after mixing with water lowers the pH of the rain water to a value less than 4, which is very harmful.

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