Question

The ionic compound containing ${Fe}^{3+}$ and $(S{O}_4{)}^{2-}$ would have the formula

• A.
• B.
• C.
• D.

Answer 1

The correct option is C

The valency of ${Fe}^{3+}$ ion is 3 and that of $(S{O}_4{)}^{2-}$ ion is 2. So, on cross-multiplication of valencies, the formula of the ionic compound containing ${Fe}^{3+}$ and $(S{O}_4{)}^{2-}$ is $F{e}_2(S{O}_4{)}_3$. It is also called as iron(III) sulphate or Ferric sulphate.