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The formulae of ferric alum

$\begin{array}{1 1}(a)\;(NH_4)_2SO_4Fe_2(SO_4)_3\\(b)\;(NH_3)_2SO_4Fe(SO_2)_3\\(c)\;(NH_2)_3SO_3Fe_2(SO_2)_3\\(d)\;(NH_4)_2SO_3Fe_2(SO_3)_2\end{array}$

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A)
The formulae of ferric alum is $(NH_4)_2SO_4Fe_2(SO_4)_3$
Hence (a) is the correct answer.
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