A student requires hard water for an experiment in his laboratory which is not available in the neighbouring area. In the laboratory there are some salts, which when dissolved in distilled water can convert it into hard water. Select from the following groups of salts, a group, each salt of which when dissolved in distilled water will make it hard.; A. Sodium chloride, Potassium chloride; B. Sodium sulphate, Potassium sulphate; C. Sodium sulphate, Calcium sulphate; D. Calcium sulphate, Calcium chloride(All India - 2017)
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Answer:
D. Calcium sulphate, Calcium 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.
Explanation:
- 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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