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 \( K_2Cr_2O_7 \) are both strong oxidizing agents and can oxidize \( I^- \) to \( I_2 \) and \( S_2O_3^{2-} \) to \( SO_4^{2-} \).
Step 2: Both can also oxidize \( I^- \) to \( IO_3^- \), but \( Fe^{2+} \) is only oxidized by \( KMnO_4 \), not \( K_2Cr_2O_7 \).
Final Conclusion: The correct answer is Option (1), A, D, and E.