Permanent hardness of water is due to the presence of:
A
Calcium bicarbonate
B
Magnesium bicarbonate
C
Calcium sulphate
D
Sodium bicarbonate
Correct Option:
C
Explanation
Permanent hardness is produced mainly by soluble chlorides and sulphates of calcium and magnesium. Bicarbonates generally cause temporary hardness because boiling can remove it.
