| In the neighbourhood of your school, hard water required for an experiment is not available. Select from the following groups of salts available in your school, a group each member of which, if dissolved in distilled water, will make it hard: |
| (a) Sodium chloride, calcium chloride |
| (b) Potassium chloride, sodium chloride |
| (c) Sodium chloride, magnesium chloride |
| (d) Calcium chloride, magnesium chloride |
Answer:
(d) Calcium chloride, magnesium chloride
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