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Question

The chemical formula of the ionic compound containing Fe3+ and (SO4)2−is____.

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 and balancing the 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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