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Question

Temporary hardness of water can be removed by:

A
filtration
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B
boiling
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C
decantation
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D
washing soda
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Solution

The correct option is D boiling
By boiling, the bicarbonates undergo decomposition to form insoluble carbonates of Ca/Mg which can further be removed by filtration.
Ca(HCO3)2(aq)CaCO3(s)+CO2(g)+H2O(l)
Mg(HCO)3(aq)MgCO3(s)+CO2(g)+H2O(l)
Then the water obtained will be free from Ca and Mg ions and is soft.

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