Hydrogen - Result Question 7
####9. Which of the following groups of ions makes the water hard?
[1994]
(a) Sodium and bicarbonate
(b) Magnesium and chloride
(c) Potassium and sulphate
(d) Ammonium and chloride.
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Solution:
- (b) Temporary hardness is due to presence of bicarbonates of calcium and magnesium and permanent hardness is due to the sulphates or chlorides of both of calcium and magnesium.
