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The D-And-f-Block Elements

Question
CBSEENCH12007184

Explain the catalytic action of Fe(III) between the reaction of I and persulphate ion S2O82–.

Solution
Reaction involved between I ion and persulphate ion is

2I-+S2O82-   Fe   I2+2SO42-

The mechanism of the reaction with Fe(III) as catalyst is

3Fe3+ + 2I–  → 2Fe2+ + I2
2Fe2+ + S2Og2 → Fe3+ + 2SO42–