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Question

The temporary hardness of water can be removed by:

A
addition of potassium permanganate
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B

boiling

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C

cooling

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D

addition of chlorine

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Solution

The correct option is B

boiling


The temporary hardness of water is caused by calcium and magnesium bicarbonates, which decompose to carbonates on boiling and these have much lower solubility in water. The reaction occurs as follows:

Ca(HCO3)2boilCaCO3+H2O+CO2

The calcium carbonate formed is insoluble and can be removed by filtration. Therefore, by boiling, the temporary hardness of water can be removed.


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