The bleaching action of the bleaching powder is due to liberation of :

nascent chlorine

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nascent oxygen

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nascent hydrogen

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atomic hydrogen

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Solution

The correct option is B nascent oxygen
On account of the formation of nascent oxygen, it shows oxidising and bleaching properties.

$2 C a O C l_{2} + H_{2} S O_{4} ⟶ C a C l_{2} + C a S O_{4} + 2 H C l O$

$H C l O ⟶ H C l + (O)$

Coloured Matter $+ (O) ⟶$ Colourless product

Hence, option $B$ is correct.

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