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# What is the formula of calgon?

$\begin{array}{1 1}(a)\;(NaPO_3)_6&(b)\;Mg_3(PO_4)_2\\(c)\;Na_3PO_4&(d)\;MgSO_4\end{array}$

$(NaPO_3)_6$
Hence (a) is the correct option.

+1 vote