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Question

Bleaching powder is prepared by passing _______ gas over dry slaked lime.

A
hydrogen
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B
nitrogen
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C
oxygen
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D
chlorine
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Solution

The correct option is D chlorine
Bleaching powder Ca(OCl)2 is formed by passing chlorine gas over dry slaked lime at 400 °C.

2Ca(OH)2(l)+2Cl2(g) Ca(OCl)2(s)+2H2O(l)+Ca(Cl)2(aq)

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