First slide

Hardness of water

Question

Which of the following groups of ions makes the water hard ?

Easy

A

Sodium and bicarbonate
B

Magnesium and chloride
C

Potassium and sulphate
D

Ammonium and chloride

Solution

Temporary hardness is due to the presence of bicarbonates of calcium and magnesium and permanent hardness is due to the sulphates or chlorides of both of calcium and magnesium.

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