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Question

Which of the following should be used as a disinfectant?

A
Na2CO3
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B
CaOCl2
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C
NaCl
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D
NaHCO3
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Solution

The correct option is B CaOCl2
Among the given options CaOCl2 (calcium oxychloride) is the formula of bleaching powder. It is used as a bleaching agent and disinfectant. It undergoes decomposition due to the carbon dioxide in air to release chlorine gas along with calcium carbonate. The reaction involved is given below:

CaOCl2(s)+CO2(g )CaCO3(s)+Cl2(g )

The released chlorine gas provides the disinfecting property to the bleaching powder.

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