Auto-oxidation of bleaching powder gives:

$3 H_3PO_2 \xrightarrow{\Delta} (X) + PH_3;$ The reaction is:

$MnO_4^{2-}$ undergoes a disproportionation reaction in an acidic medium,but $MnO_4^{-}$ does not. Give a reason.

What is meant by 'disproportionation' of an oxidation state? Give an example.

Among $P_4$,$S_8$ and $N_2$,the elements which undergo disproportionation when heated with $NaOH$ solution are:

Write the balanced chemical equation for the reaction of $Cl_{2}$ with hot and concentrated $NaOH$. Is this reaction a disproportionation reaction? Justify.