In the neighborhood 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(All India - 2016)
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D. Calcium chloride, magnesium chloride
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When compounds given in option D. (Calcium chloride and Magnesium chloride) are dissolved in distilled water, it will make the water hard.
- Distilled water is an example of soft water. The main criteria which distinguish water as soft and hard are its chemical constituents.
- Soft water is composed of a high amount of sodium, whereas hard water is composed of sodium, magnesium and calcium.
- As per the given scenario, to convert the distilled water into hard water, to it substance such as calcium chloride and magnesium chloride must be added.
- In this way, the distilled water can be converted into hard water and used for the experiment.
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