In the neighbourhood of your school, hard water required for an experiment is not available. Select from the following group of salts available in your school, a group each member of which, if dissolved in distilled water, will make it hard:- Sodium chloride, calcium chloride
- Potassium chloride, sodium chloride
- Sodium chloride, magnesium chloride
- Calcium chloride, magnesium chloride
Correct Answer: (d) Calcium chloride, magnesium chloride
Explanation: Water described as "hard" is high in dissolved minerals, specifically calcium and magnesium. Chlorides of calcium and magnesium dissolved in water are the two most common minerals that make water "hard."
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