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

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Solution

Q.
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: [2024]

1 B only

2 A only

3 B and C only

4 A and D only

Ans.
(4)

$2 I^{-} + S_{2} O_{8}^{2 -} \to I_{2} + 2 {SO}_{4}^{2 -}$

In this reaction iron acts as catalyst as explained below:

${Fe}^{3 +}$ oxidizes the iodide ion

$2 {Fe}^{3 +} + 2 I^{-} \to 2 {Fe}^{2 +} + I_{2}$

${Fe}^{2 +}$ reduces the persulphate ion (oxygen is reduced from -1 to -2).

$2 {Fe}^{2 +} + S_{2} O_{8}^{2 -} \to 2 {Fe}^{3 +} + 2 {SO}_{4}^{2 -}$

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