Hard water is not available for an experiment. Some salts are given below:; (I) Sodium chloride; (II) Sodium sulphate; (Ill) Calcium chloride; (IV) Calcium sulphate; (V) Potassium chloride; (VI) Magnesium sulphate; Select from the following a group of these salts, each member of which may be dissolved in water to make it hard.; A. I, II and V; B. I, III, V; C. Ill, IV, VI; D. II, IV, VI(Delhi - 2015)
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Correct option is - C. Ill, IV, VI
Hard water is the water with high mineral content and due to this reason this water provides required minerals to our body.
Hard water specifically contains sulphates, chloride salts of calcium and magnesium. They are found deposited after boiling of water and also in pipes etc.
Contrary to hard water is the soft water which lacks calcium and magnesium ions and is known to contain sodium ions. Soft water is obtained through rain.
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