Iron (III) catalyses the reaction between iodide and persulphate ions, in which A. $\mathrm{Fe}^{3+}$ oxidises the iodide ion B. $\mathrm{Fe}^{3+}$ oxidises the persulphate ion C. $\mathrm{Fe}^{2+}$ reduces the iodide ion D. $\mathrm{Fe}^{2+}$ reduces the persulphate ion Choose the most appropriate answer from the options given below:

JEE Main · 2024 · 08 Apr 2024 · Shift 1 · Redox Reactions and Electrochemistry

Iron (III) catalyses the reaction between iodide and persulphate ions, in which
A.

Fe^{3 +}

oxidises the iodide ion
B.

Fe^{3 +}

oxidises the persulphate ion
C.

Fe^{2 +}

reduces the iodide ion
D.

Fe^{2 +}

reduces the persulphate ion

Choose the most appropriate answer from the options given below:

Answer: (D)

In the Fe(III)-catalysed iodide–persulphate reaction:

F e^{3 +}

oxidises

I^{-}

I_{2}

(A), and the resulting

F e^{2 +}

reduces persulphate

S_{2} O_{8}^{2 -}

back to sulphate (D), regenerating

F e^{3 +}

. So A and D only — option (4).

JEE Main · 2024 · 08 Apr 2024 · Shift 1 · Single correct option