Salt of the following is used as a water softner

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H₄P₂O₇

HPO₂

H₄P₂O₆

HPO₃

answer is C.

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Detailed Solution

1.Salt of the HPO₃ is used as a water softner

2.Hexamer of phosphoric acid exist as sodium salt which is called sodium metaphophate or sodium polymetaphosphate and it is commercially known as "CALGON" and use as water softener.

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