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Question
Give a scientific explanation.
Bleaching powder has the odour of chlorine.
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Solution
Chlorine is the main ingredient in bleaching powder. When exposed to air, bleaching powder reacts with carbon dioxide in the air to produce calcium carbonate and chlorine. Thus, it smells of chlorine.
CaOCl2 + CO2 `->` CaCO3 + Cl2
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Bleaching powder
CaOCl2 will liberate Cl2 gas in the presence of
(i) CO2
(ii) HCl
(iii) CO
(iv) NO
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The chemical reaction between MnO2 and HCl is an example of:
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Reason (R): Quicklime reacts vigorously with water releasing a large amount of heat.
