Chemistry
Grade-10
Easy
Question
Which of the following materials are used for the preparation of bleaching powder
- Sodium hydroxide and chlorine
- Calcium sulphate and Carbon dioxide
- Slaked lime and chlorine
- Chlorine and calcium carbonate
Hint:
Ca(OH)2 + Cl2 
CaOCl2 + H2O
The correct answer is: Slaked lime and chlorine
Bleaching powder is synthesised by the action of chlorine gas on dry slaked lime. Chlorine produced on passing electricity through brine solution undergoes reaction with dry slaked lime.
Ca(OH)2 + Cl2 CaOCl2 + H2O
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