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Calgon (a water softener) is :

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Calgon (a water softener) is :
A. `Na_(2)[Na_(4)(PO_(3))_(6)]`
B. `Na[Na_(2)(PO_(3))]_(6)`
C. `Na_(2)[Na_(4)(PO_(4))_(6)]`
D. `Na_(4)[Na_(2)(PO_(4))_(6)]`
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Correct Answer - A
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