MEDIUMMCQ SINGLENEET ChemistryInorganic ChemistryHydrogenPrevious Year Questions

Which of the following groups of ions makes the water hard? (AIPMT 1994)

A.Sodium and bicarbonate

B.Magnesium and chloride✓ Correct

C.Potassium and sulphate

D.Ammonium and chloride

Explanation

Hardness of water is due to the presence of bicarbonates, chlorides and sulphates of Ca and Mg. Hence, hard water will consist of Mg2+ and Cl– ions.

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