The temporary hardness of water can be removed by:

addition of potassium permanganate

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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

Q. Temporary hardness of water can be removed by addition of chlorine.

Both temporary and permanent hardness in water can be removed by the addition of washing soda. Which of the following reactions represents the removal of permanent hardness in water?

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

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

in hard water is converted to insoluble

C a C O_{3}

on moderate heating.

Q. Permanent hardness of water may be removed by the addition of:

Temporary hardness of water can be removed by

(a) filtering

(b) boiling

(d) none of the above

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