Oxides of sulphur present in the atmosphere are washed down by rain and would result in:

lowering of

p H

of the soil

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increase in

p H

of the soil

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increase in

O_{3}

quantities

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none of these

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Solution

The correct option is B lowering of $p H$ of the soil
The oxides of sulphur $(S O_{2}$ and $S O_{3})$ present in the atmosphere dissolve in rainwater to form acids $(H_{2} S O_{3}$ and $H_{2} S O_{4}$ respectively $)$ . These acids would lower the $p H$ of the soil.
The reactions are:
$S O_{2} + H_{2} O \to H_{2} S O_{3}$
$S O_{3} + H_{2} O \to H_{2} S O_{4}$

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