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

A. oxidises the iodide ion
B. oxidises the persulphate ion
C. reduces the iodide ion
D. reduces the persulphate ion

Question

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

A.  oxidises the iodide ion
B.  oxidises the persulphate ion
C.  reduces the iodide ion
D.  reduces the persulphate ion

Choose the most appropriate answer from the options given below:

Canvas Classes · Accepted Answer

Concept: Fe³⁺ as intermediate catalyst

The overall reaction:

Fe³⁺ acts as an intermediate catalyst in two steps:

Step 1:  oxidises :

Step 2:  reduces  (persulphate):

Fe³⁺ is regenerated → acts as a true catalyst.

Correct statements: A and D

Answer: Option (4) — A and D only

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