In order to oxidize a mixture of mole of each of , , and in acidic medium, the number of moles of required is:

Question

In order to oxidize a mixture of  mole of each of , ,  and  in acidic medium, the number of moles of  required is:

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Strategy:
 In a redox reaction involving a mixture, the total equivalents of the oxidizing agent () must equal the sum of the equivalents of all reducing species in the sample. We identify which components in the mixture can be oxidized and calculate their individual n-factors.

Step 1: Identify oxidizable species and their n-factors
In acidic medium,  (n=5) oxidizes:
1. :  (1e) and  (2e). Total n-factor .
2. : 3 oxalates  electrons. (Fe is already ). Total n-factor .
3. :  (1e). Total n-factor

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