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Hard water is not available for an experiment. Some salts are given below : (I) Sodium chloride (II) Sodium sulphate (III) Calcium chloride (IV) Calcium

sulphate (V) Potassium chloride (VI) Magnesium sulphate Select from the following group of these salts, each member of which may be dissolved in water to make it hard. (A) I, II, V (B) I, III, V (C) III, IV, VI (D) II, IV, VI


ANSWER is option A (I.II.V)...........................
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