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:
(c) III, IV, VI
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