First slide

Hardness of water

Question

Which of the following is not true ?

Easy

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

Solution

Permanent hardness cannot be removed by boiling of water but temporary hardness can be removed.

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