Q. Hardness of water is cause by soluble salts of

A
Sodium and Potassium
B
Potassium and Ammonium
C
Sodium and calcium
D
calcium and magnesium
Solution:

Hard water contains dissolved magnesium and calcium ions. … Temporary hardness is caused by dissolved calcium hydrogencarbonate (which is removed by boiling). Permanent hardness is caused by dissolved calcium sulfate (which is not removed by boiling). Water can be softened using washing soda or an ion-exchange resin.

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