Calgon (a water softener) is

N a_{2} [N_{a_{4}} (P O_{3})_{6}]

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N a_{4} [N_{a_{2}} (P O_{3})_{6}]

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N a_{2} [N_{a_{4}} (P O_{4})_{6}]

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N a_{4} [N_{a_{2}} (P O_{4})_{6}]

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Solution

The correct option is A $N a_{2} [N_{a_{4}} (P O_{3})_{6}]$
Sodium hexameta phosphate is called calgon.

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