Question

Identify the oxidizing reactions of KMnO$_4$ in acidic medium. I.Liberation of iodine from KI
II.Conversion of \(\text{Fe}^{2+}\) to \(\text{Fe}^{3+}\)
III.Oxidation of nitrite to nitrate
IV.Oxidation of iodide to iodate

• A. II, III, IV only
• B. II, III only
• C. I, III, IV only
• D. I, II, III only \

Hint:

KMnO$_4$ is a strong oxidizing agent in acidic conditions and commonly oxidizes iodide, ferrous ions, and nitrites.

Answer 1

The Correct Option is D

Let's evaluate the reactions: \begin{itemize} \item 

Option I: Liberation of iodine from KI – This is true. KMnO$_4$ acts as an oxidizing agent in acidic medium and liberates iodine (I$_2$) from KI. \item 

Option II: Conversion of Fe$^{2+}$ to Fe$^{3+}$ – This is true. KMnO$_4$ oxidizes Fe$^{2+}$ to Fe$^{3+}$ in acidic medium. \item 

Option III: Oxidation of nitrite to nitrate – This is true. KMnO$_4$ oxidizes nitrites (NO$_2^-$) to nitrates (NO$_3^-$) in acidic medium. \item 

Option IV: Oxidation of iodide to iodine – This is false. Although KMnO$_4$ can oxidize iodide (I$^-$) in alkaline or neutral medium, it doesn't typically oxidize iodide to iodine in acidic medium. \end{itemize} Thus, the correct set of reactions is I, II, and III.