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Question

Which of the given dilute acids react with bleaching powder to release chlorine gas?

A
Sulphuric acid
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B
Nitric acid
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C
Hydrochloric acid
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D
Acetic acid
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Solution

The correct option is C Hydrochloric acid
The chemical formula of bleaching powder is CaOCl2. When dilute sulphuric acid and dilute hydrochloric acid are added to it, it reacts completely with them to release chlorine gas as shown below:
CaOCl2(s) + H2SO4(aq) CaSO4(s)+ Cl2(g)+ H2O(l)CaOCl2(s) +2HCl(aq)CaCl2(s)+ Cl2(g)+ H2O(l)

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