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Question

Substance A is yellowish-white in colour and releases chlorine gas on reaction with dilute hydrochloric acid. The substance A is _______.

A
baking soda
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B
common salt
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C
washing soda
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D
bleaching powder
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Solution

The correct option is D bleaching powder
Bleaching powder with chemical name calcium oxychloride (CaOCl2) has yellowish-white colour. It releases chlorine gas on reaction with dilute hydrochloric acid (HCl) and sulphuric acid (H2SO4). The reactions are given 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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