Which of the following oxidation reactions are carried out by both $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$…

Which of the following oxidation reactions are carried out by both $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ and $\mathrm{KMnO}_4$ in acidic medium?
A. $\Gamma^{-} \rightarrow \mathrm{I}_2$
B. $S^{2-} \rightarrow S$
C. $\mathrm{Fe}^{2+} \rightarrow \mathrm{Fe}^{3+}$
D. $\Gamma^{-} \rightarrow \mathrm{IO}_3{ }^{-}$
E. $\mathrm{S}_2 \mathrm{O}_3{ }^{2-} \rightarrow \mathrm{SO}_4{ }^{2-}$
Choose the correct answer from the options given below:
  1. C, D and E Only
  2. B, C and D Only
  3. A, D and E Only
  4. A, B and C Only

Solution

$\mathrm{I}^{-} \xrightarrow{\mathrm{OH}} \mathrm{IO}_3^{-}$
$\mathrm{S}^{-2} \xrightarrow{\mathrm{H}^{+}} \mathrm{S}$
$\mathrm{S}_2 \mathrm{O}_3^{2-} \xrightarrow{\mathrm{OH}} \mathrm{SO}_4^{2-}$
$\begin{aligned}
& \mathrm{Fe}^{+2} \longrightarrow \mathrm{Fe}^{+3} \\
& \mathrm{~S}_2 \mathrm{O}_3^{2-} \xrightarrow{\mathrm{H}^{+}} \mathrm{S} \downarrow+\mathrm{SO}_4^{2-}
\end{aligned}$

Asked in: JEE Main 2025 (28 Jan Shift 1)

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