First slide

Hardness of water

Question

Point out the incorrect statement

Moderate

A

Hardness of water depends upon its soap consuming power
B

Temporary hardness is due to bicarbonates of calcium and magnesium
C

Permanent hardness is due to soluble sulphates, chlorides and nitrates of Ca and Mg
D

Permanent hardness can be removed by boiling water

Solution

Permanent hardness can be treated only by chemicals.

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