Which of the following reaction(s) is/are correct?

(a) $F{e}^{3+}+{I}^{-}⟶{I}_{2}+F{e}^{2+}$
(b) $F{e}^{3+}+{I}^{-}⟶Fe{I}_{3}$
(c) $F{e}^{2+}+{S}_{2}{O}_{8}^{2-}⟶Fe+2S{O}_{4}^{2-}$
(d) $F{e}^{2+}+{S}_{2}{O}_{8}^{2-}⟶F{e}^{3+}+2S{O}_{4}^{2-}$

Question

Which of the following reaction(s) is/are correct?

(a) $F{e}^{3+}+{I}^{-}⟶{I}_{2}+F{e}^{2+}$
(b) $F{e}^{3+}+{I}^{-}⟶Fe{I}_{3}$
(c) $F{e}^{2+}+{S}_{2}{O}_{8}^{2-}⟶Fe+2S{O}_{4}^{2-}$
(d) $F{e}^{2+}+{S}_{2}{O}_{8}^{2-}⟶F{e}^{3+}+2S{O}_{4}^{2-}$

YESPYQ · Accepted Answer

Correct answer: c) (a) and (d) only. (a) $\mathrm{F}{\mathrm{e}}^{3+}$ oxidises ${\mathrm{I}}^{−}$ to ${\mathrm{I}}_{2}$ and itself gets reduced to $\mathrm{F}{\mathrm{e}}^{2+}$ → correct redox reaction . (b) $\mathrm{F}\mathrm{e}{\mathrm{I}}_{3}$ is not stable in aqueous solution → incorrect . (c) $\mathrm{F}{\mathrm{e}}^{2+}$ cannot be reduced to Fe (0) by ${\mathrm{S}}_{2}{\mathrm{O}}_{8}^{2−}$ → incorrect . (d) ${\mathrm{S}}_{2}{\mathrm{O}}_{8}^{2−}$​ is a strong oxidant and oxidises $\mathrm{F}{\mathrm{e}}^{2+}$ to $\mathrm{F}{\mathrm{e}}^{3+}$ → correct .

Which of the following reaction(s) is/are correct? (a) \(F{e}^{3+}+{I}^{-}⟶{I}_{2}+F{e}^{2+}\) (b) \(F{e}^{3+}+{I}^{-}⟶F…

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