Question

Which of the following oxidation reactions are carried out by both \( K_2Cr_2O_7 \) and \( KMnO_4 \) in acidic medium? A. \( I^- \rightarrow I_2 \) B. \( S^{2-} \rightarrow S \) C. \( Fe^{2+} \rightarrow Fe^{3+} \) D. \( I^- \rightarrow IO_3^- \) E. \( S_2O_3^{2-} \rightarrow SO_4^{2-} \) Choose the correct answer from the options given below:

• A. A, D and E Only
• B. A, B and C Only
• C. B, C and D Only
• D. C, D and E Only

Hint:

When dealing with strong oxidizers, always check which ions they can oxidize in acidic conditions.

Answer 1

The Correct Option is A

Step 1: \( KMnO_4 \) and \( K_2Cr_2O_7 \), potent oxidizing agents, convert \( I^- \) to \( I_2 \) and \( S_2O_3^{2-} \) to \( SO_4^{2-} \).

Step 2: While both reagents oxidize \( I^- \) to \( IO_3^- \), only \( KMnO_4 \) oxidizes \( Fe^{2+} \); \( K_2Cr_2O_7 \) does not.

Final Conclusion:
The correct answer is Option (1), A, D, and E.