What happens when (only give chemical reaction):
(i) ${C l}_{2}$ gas is passed over dry slacked lime?
(ii) Potash alum is heated at red hot temperature?

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Solution

(i) ${C l}_{2}$ gas is passed over dry slacked lime, bleaching powder is obtained.
$C a (O H)_{2} + C l_{2} \to C a O C l_{2} + H_{2} O$
(ii) Potash alum is heated at red hot temperature:
On heating, potash alum loses its water of crystallization. On rapidly heating to high temperature, the alum swells up and a porous mass called burnt alum is left behind.

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