The chemical formula of the ionic compound containing ${F e}^{3 +}$ and $(S O_{4})^{2 -}$ is____.

{F e}_{3} S O_{4}

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{F e}_{2} S O_{4}

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{F e}_{3} (S O_{4})_{2}

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{F e}_{2} (S O_{4})_{3}

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Solution

The correct option is D ${F e}_{2} (S O_{4})_{3}$
The valency of ${F e}^{3 +}$ ion is 3 and that of $(S O_{4})^{2 -}$ ion is 2. So, on cross-multiplication and balancing the valencies, the formula of the ionic compound containing ${F e}^{3 +}$ and $(S O_{4})^{2 -}$ is $F e_{2} (S O_{4})_{3}$ . It is also called as iron(III) sulphate or Ferric sulphate.

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