Which of the following is not true?
- AHardness of water depends on its behaviour towards soap.
- BThe temporary hardness is due to the presence of $Ca$ and $Mg$ bicarbonates.
- CPermanent hardness is due to the presence of soluble $Ca$ and $Mg$ sulphates,chlorides and nitrates.
- DPermanent hardness can be removed by boiling the water.
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