MEDIUMMCQ SINGLEJEE Mains ChemistryInorganic ChemistryHydrogenPrevious Year Questions

Permanent hardness of water is due to the presence of (Kerala CEE 2011)

A.bicarbonates of sodium and potassium

B.chlorides and sulphates of calcium and magnesium✓ Correct

C.bicarbonates of calcium and magnesium

D.phosphates of sodium and potassium

Explanation

Hardness of water is due to the presence of salts of calcium and magnesium. The hardness of water can be classified as temporary and permanent hardness based on the composition of salts present in the water. Permanent hardness is due to the presence of chlorides and sulphates salts of calcium and magnesium.

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