All dilute acids react with bleaching powder, liberating:

chlorine gas

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hydrogen gas

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nitrogen gas

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H C l

gas

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Solution

The correct option is C chlorine gas
Mixing a hypochlorite bleach with acid yields chlorine gas. Bleach often removes the color often by oxidation as all bleaches are oxidising agents.
Reaction : $C a O C l_{2} + 2 H C l \to C a C l_{2} + C l_{2} + H_{2} O$

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

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