Chemistry
Grade-10
Easy
Question
Which of the following substances loses its activity when it stands for long time
- Chlorine
- Hydrogen chloride
- Calcium bicarbonate
- Bleaching powder
Hint:
Bleaching powder absorbs moisture.
The correct answer is: Bleaching powder
- Bleaching powder loses its activity when it stands for long time.
- Bleaching powder absorbs moisture, it has self oxidizing property.
- It reacts with carbon dioxide in air.
2Ca(OCl)2 + 2CO2 
2CaCO3 + 2Cl2 + O2
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