What happens?
A) When bleaching powder is kept open in air.
B) Chlorine gas is passed through dry slaked lime.

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Solution

A) Bleaching powder is yellowish white powder with a strong smell of chlorine. This is because bleaching powder reacts with carbondioxide from the atmosphere to produce calcium carbonate and chlorine.
$C a O C l_{2} + C O_{2} ⟶ C a C O_{3} + C l_{2} ↑$

B) When chlorine is passed through slaked lime bleaching powder is formed.
$C a (O H)_{2} + C l_{2} ⟶ C a O C l_{2} + H_{2} O$

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

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