JEE Main Chemistry question

Oxygen is obtained from bleaching powder by:

(A)The action of dilute acidCorrect
(B)The action of alkali
(C)Heating it with lime
(D)Heating it with cobalt salt

Answer: (A)

Solution

Treating bleaching powder with a dilute acid, such as , liberates hypochlorous acid, 2CaOCl_2 + H_2SO_4 \rightarrow CaCl_2 + CaSO_4 + 2HOCl, which decomposes to release nascent oxygen, . Action of alkali, heating with lime, or heating with a cobalt salt (B,

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Question ID VK-138021