The temporary hardness of water can be removed by:

Addition of potassium permagenate

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Boiling

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Cooling

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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:

${Ca(HCO}_{3})_{2} boil - - \to {CaCO}_{3} + H_{2} O + {CO}_{2}$

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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Similar questions

Temporary hardness of water can be removed by

(a) filtering

(b) boiling

(d) none of the above

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Explain how temporary hardness of water can be removed by boiling ?

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Q. Assertion :Temporary hardness can be removed by addition of lime. Reason:

C a (H C O_{3})_{2}

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C a C O_{3}

on moderate heating.

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