A gas that cannot be collected over water is:

{P H}_{3}

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S O_{2}

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O_{3}

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N_{2}

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Solution

The correct option is B $S O_{2}$
A gas that cannot be collected over water is $S O_{2}$ .
$S O_{2}$ reacts with water forming $H_{2} S O_{3}$ . Hence, it cannot be collected over water
$S O_{2} + H_{2} O \to H_{2} S O_{3}$

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