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Question

The ionic compound containing Fe3+ and (SO4)2− would have the formula


A

Fe2SO4

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B

Fe3(SO4)2

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C

Fe2(SO4)3

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D

Fe3SO4

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Solution

The correct option is C

Fe2(SO4)3


The valency of Fe3+ ion is 3 and that of (SO4)2 ion is 2. So, on cross-multiplication of valencies, the formula of the ionic compound containing Fe3+ and (SO4)2 is Fe2(SO4)3. It is also called as iron(III) sulphate or Ferric sulphate.


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