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One of the chemical methods of softening...

One of the chemical methods of softening water is sequestration. In this process :

A

Ca and Mg are precipitated from hard water as carbonates and phosphates

B

Hard water is treated with sodium poly meta phosphate to form soluble non-interfering Ca & Mg complexes

C

Coagulation of calcium and magnesium salts takes place

D

Ion-exchanger is used for purification of hard water

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