All dilute acids react with bleaching powder, liberating __________.

oxygen gas

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chlorine gas

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sulphur dioxide gas

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hydrogen gas

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Solution

The correct option is C chlorine gas
Dil. acids react with bleaching powder to liberate chlorine gas. The chlorine produced acts as a bleaching agent that oxidizes coloured substances, making them colourless.
$C a O C l_{2} + H_{2} S O_{4} \to C a S O_{4} + C l_{2} + H_{2} O$

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Bleaching powder in reaction with dilute hydrochloric acid releases hydrogen gas(H₂).

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