MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Inorganic 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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