Bleaching action of chlorine occurs in the presence of :

oxygen

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moisture

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dry air

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sunlight

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Solution

The correct option is B moisture
$C l_{2} + moisture (H_{2} O) \to H C l + H C l O$
Bleaching action of chlorine is due to $H C l O$ and therefore, $C l_{2}$ needs moisture for its bleaching action.

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