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Permanent hardness of water arises due to the presence of

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Chlorides and Sulphates of Ca and Mg

Carborates of Ca and Mg

Bicarbonates of Ca and Mg

Phosphates of Ca and Mg

answer is A.

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Permanent hardness is due to the presence of soluble salts of magnesium and calcium in the form of chlorides and sulphates in water

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