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Chemistry Question on Inorganic chemistry

Iron (III) catalyses the reaction between iodide and persulphate ions, in which
A. Fe3+\text{Fe}^{3+} oxidises the iodide ion
B. Fe3+\text{Fe}^{3+} oxidises the persulphate ion
C. Fe2+\text{Fe}^{2+} reduces the iodide ion
D. Fe2+\text{Fe}^{2+} reduces the persulphate ion
Choose the most appropriate answer from the options given below:

A

B and C only

B

B only

C

A only

D

A and D only

Answer

A and D only

Explanation

Solution

The reaction proceeds as follows:
2Fe3++2I−→2Fe2++I22\text{Fe}^{3+} + 2\text{I}^- \rightarrow 2\text{Fe}^{2+} + \text{I}_2
2Fe2++S2O82−→2Fe3++2SO42−2\text{Fe}^{2+} + \text{S}_2\text{O}_8^{2-} \rightarrow 2\text{Fe}^{3+} + 2\text{SO}_4^{2-}
In this reaction:
Fe3+^{3+} oxidizes I−^- to I2_2 and converts itself to Fe2+^{2+}.
Fe2+^{2+} reduces S2_2O82−_8^{2-} to SO42−_4^{2-} and converts itself back to Fe3+^{3+}