A) \[KMn{{O}_{4}}/{{H}_{2}}S{{O}_{4}}\]
B) \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}/{{H}_{2}}S{{O}_{4}}\]
C) \[A{{g}_{2}}O\]
D) \[F{{e}^{3+}}\]
Correct Answer: D
Solution :
\[F{{e}^{+3}}\] cannot be reduced by \[{{H}_{2}}{{O}_{2}}\] while all other get reduced.
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