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Dissolved salts of Ca and Mg which types of water impurity?

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Dissolved salts of Ca and Mg which types of water impurity?

(a) Hardness impurity

(b) Soluble colour compounds

(c) Insoluble matter impurity

(d) Pathogenic

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I would like to ask this question from Inorganic Chemical in portion Inorganic Chemical Industries of Chemical Technology

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The correct answer is (a) Hardness impurity

Easy explanation: Ca and Mg bicarbonates are the hardness impurities of water and it can be reduced by boiling to precipitate insoluble carbonates, but from sediments. By chemical reaction or ion exchange also it can be removing.

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