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Question

The temporary hardness of water due to calcium bicarbonate can be removed by adding:


Your Answer
A
CaCO3
Correct Answer
B
Ca(OH)2
Your Answer
C
CaCl2
Your Answer
D
HCl

Solution

The correct option is B Ca(OH)2
The reason for temporary hardness is owing to the presence of bicarbonates of Ca and Mg.
To remove this temporary hardness, we have to use agents that can precipitate out the 
bicarbonates in an easy-to-filter-out form:

Ca(HCO3)2+Ca(OH)22CaCO3+2H2O

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