Q.

Name the gas used in preparation of bleaching powder –

A. Oxygen
B. Hydrogen
C. Nitrogen
D. Chlorine
Answer» D. Chlorine
Explanation: Bleaching powder in manufactured by passing chlorine gas over dry slaked lime. Bleaching powder is also called calcium chlorohypochlorite be-cause it is considered as a mixed salt of hydrochloric acid and hypochlorous acid.
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