The species that undergo disproportionation in alkaline medium are
$(a) \, Cl_2 \, \, \, (b) \, MnO_4^{2-} \, \, \, (c) \, NO_2 \, \, \, (d) \, ClO_4^{-} $

Which one of the following is an example of a disproportionation reaction?

Which one of the following does not undergo disproportionation reaction?

Total number of species from the following which can undergo disproportionation reaction . . . . . . .
$H_2O_2$,$ClO_3^{-}$,$P_4$,$Cl_2$,$Ag$,$Cu^{+}$,$F_2$,$NO_2$,$K^{+}$

Which of the following reactions are disproportionation reactions?
$(a)$ $2 Cu^{+} \rightarrow Cu^{2+} + Cu^{0}$
$(b)$ $3 MnO_{4}^{2-} + 4 H^{+} \rightarrow 2 MnO_{4}^{-} + MnO_{2} + 2 H_{2}O$
$(c)$ $2 KMnO_{4} \xrightarrow{\Delta} K_{2}MnO_{4} + MnO_{2} + O_{2}$
$(d)$ $2 MnO_{4}^{-} + 3 Mn^{2+} + 2 H_{2}O \rightarrow 5 MnO_{2} + 4 H^{+}$
Select the correct option from the following:

At room temperature,disproportionation of an aqueous solution of in situ generated nitrous acid $(HNO_2)$ gives the species