10th Class Science Solved Paper - Science-2015 Delhi Set-I

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 a 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:

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