(D) The correct answer is $D$. Permanent hardness is caused by the presence of soluble salts of magnesium and calcium in the form of chlorides and sul

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Permanent hardness can be removed by boiling the water.

(D) The correct answer is $D$. Permanent hardness is caused by the presence of soluble salts of magnesium and calcium in the form of chlorides and sulphates in water. Permanent hardness cannot be removed by boiling the water,whereas temporary hardness (caused by bicarbonates) can be removed by boiling.

Class 11 Chemistry Hydrogen Water or hydride of oxygen

Medium

Which of the following is not true?

A
Hardness of water depends on its behaviour towards soap.
B
The temporary hardness is due to the presence of $Ca$ and $Mg$ bicarbonates.
C
Permanent hardness is due to the presence of soluble $Ca$ and $Mg$ sulphates,chlorides and nitrates.
D
Permanent hardness can be removed by boiling the water.