Calgon used as water softner 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})_{5}]

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none of the above

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Solution

The correct option is C $N a_{2} [N a_{4} (P O_{3})_{6}]$
Calgon $\to {N a}_{6} P_{6} O_{18} \to {N a}_{2} [{N a}_{4} {({P O}_{3})}_{6}]$ it is used as water softener, when added to hard water following reaction takes place :
${N a}_{6} P_{6} O_{18} \to {2 N a}^{+} + {N a}_{4} P_{6} O_{18}^{2 -}$
${C a}^{2 +} + {N a}_{4} P_{6} O_{18}^{2 -} \to {[{N a}_{2} C a P_{6} O_{18}]}^{2 -} + {2 N a}^{+}$

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