Chlorine acts as a bleaching agent only in presence of :

Dry air

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Moisture

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Sunlight

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Pure oxygen

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Solution

The correct option is B Moisture
$C l_{2} + H_{2} O ⟶ 2 H C l + [O]$
Chlorine needs moisture to form nascent oxygen which is important for bleaching action.

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C l_{2}

H_{2} O_{2}

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