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
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Calcium sulphate, calcium chloride, Calcium sulfate (or calcium sulphate) is the inorganic compound with the formula CaSO4 as well as related hydrates.
In the form of γ-anhydrite (the anhydrous form), it is used as a desiccant.
As well as particular hydrate is better known as plaster of Paris, as well as another occurs naturally as the mineral gypsum.
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Explanation:
Calcium Sulphate & Calcium Chloride
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