Verified Solution • 2025–26 Session moderate

QJEEM25Ch441b: JEE Main 2025 Chemistry - Class 11 JEEM25Ch441b Solution: Which of the following oxidation reactions are carried out by…

Which of the following oxidation reactions are carried out by both K2Cr2O7\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7 and KMnO4\mathrm{KMnO}_4 in acidic medium?

A. Γ−→I2\Gamma^{-} \rightarrow \mathrm{I}_2

B. S2−→S\mathrm{S}^{2-} \rightarrow \mathrm{S}

C. Fe2+→Fe3+\mathrm{Fe}^{2+} \rightarrow \mathrm{Fe}^{3+}

D. I−→IO3−\mathrm{I}^{-} \rightarrow \mathrm{IO}_3^{-}

E. S2O32−→SO42−\mathrm{S}_2 \mathrm{O}_3{ }^{2-} \rightarrow \mathrm{SO}_4^{2-}

Choose the correct answer from the options given below :

Multiple Choice Options

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

Step-by-Step Verified Solution

I−→H+I2I−→OH−IO3−\mathrm{I}^{-} \xrightarrow{\mathrm{H}^{+}} \mathrm{I}_2\qquad \mathrm{I}^{-} \xrightarrow{\mathrm{OH}^{-}} \mathrm{IO}_3^{-}

S−2→H+SS2O32−→OH−SO42−\mathrm{S}^{-2} \xrightarrow{\mathrm{H}^{+}} \mathrm{S} \quad \mathrm{S}_2 \mathrm{O}_3^{2-} \xrightarrow{\mathrm{OH}^{-}} \mathrm{SO}_4^{2-}

amp;Fe+2⟶Fe+3amp; S2O32−→H+S↓+SO42−\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}

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