Calgon removes hardness of water

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Calgon removes hardness of water

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by precipitating ${Ca}^{+}^{2} and {Mg}^{+ 2}$

by formation of adsorption complex

by absorption of hardness

by decomposition of Ca and Mg salts

answer is A.

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Detailed Solution

Permanent hardness of water can be removed by Calgon method. Calgon removes hardness by forming complex compounds with the Ca²⁺and Mg²⁺ions of hard water or by adsorption.

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