Which of the following represents calgon?

N a_{2} A l_{2} S i_{2} O_{8}

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M g_{3} (P O_{4})_{2}

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

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N a_{2} [M g_{2} (P O_{3})_{6}]

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Solution

The correct option is C $N a_{2} [N a_{4} (P O_{3})_{6}]$
Calgon is the complex salt of meta phosphoric acid. It is sodium hexametaphosphate $(N a P O_{3})_{6}$ . It is represented as $N a_{2} [N a_{4} (P O_{3})_{6}] .$
Hard water is percolated over Calgon (sodium hexameta phosphate $N a_{6} P_{6} O_{18}$ ). Calgon reacts calcium (or magnesium) ions present in hard water. Inactive complex ions are formed that do not precipitate with soap.

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

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