Calgon used as a water softener is
(a) Na₂[Na₄(PO₃)₆] (b) Na₄[Na₂ (PO₃ )₆ ]
(c) Na₄[Na₄ (PO₄ )₅] (d) Na₄[Na₂ (PO₄ )₆ ]
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The calgon used as a water softner is (a)Na2[Na4(PO3)6]
1.It is used as a water softner as it displaces calcium and magnesium ions from hard water and displaces it with the sodium ions from the anions of the calogen
2.Thus tha calcium and magnesium ions are removed from the hard water and leads to the formation of complex with the calgon
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