Hard water required for an experiment is not available in a school laboratory. However, following salts are available in the laboratory. Select the salts which may be dissolved in water to make it hard for the experiment.1. Calcium Sulphate2. Sodium Sulphate3. Calcium Chloride4. Potassium Sulphate5. Sodium Hydrogen Carbonate6. Magnesium Chloride(a) 1, 2 and 4 (b) 1, 3 and 6 (c) 3, 5 and 6 (d) 2, 4 and 5
Correct Answer: (b) 1, 3 and 6
Explanation: Hard water contains Ca2+ and Mg2+ ions. Thus the salts which can be added to water to make it hard are calcium sulphate, calcium chloride and magnesium chloride i.e., the salts 1, 3 and 6.
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