1.

Calgon used as a water softener is

Answer»

`Na_(2)[Na_(4)(PO_(4))_(5)]`
`Na_(4)[Na_(2)(PO_(3))_(6)]`
`Na_(2)[Na_(4)(PO_(3))_(6)]`
`Na_(4)[Na_(4)(PO_(4))_(6)]`

SOLUTION :CALGON is `Na_(2)[Na_(4)(PO_(3))_(6)].`


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