On treating $SO_2$ with an aqueous solution of $KMnO_4$,the manganese ion reduces to

Potassium permanganate works as an oxidising agent both in acidic and basic medium. In both states,the products obtained by $KMnO_4$ are respectively:

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:

In which of the following reactions does $HNO_3$ $NOT$ act as an oxidizing agent?

Bromine water reacts with $SO_2$ to form

$10 \, \text{mole}$ of ferric oxalate is oxidised by $x \, \text{mole}$ of $MnO_4^-$ in acidic medium. The value of $x$ is