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

Identify the pair of reactions undergoing disproportionation from the following.

Which one of the following does not undergo disproportionation reaction?

Which of the following acts as both an oxidizing and a reducing agent?

Identify the oxidation states of $Mn$ when $MnO_4^{2-}$ ion undergoes disproportionation reaction under acidic medium.

Assign $A$,$B$,$C$,$D$ from given type of reaction.
$A$ for precipitate formation reaction.
$B$ for precipitate dissolution reaction.
$C$ for precipitate exchange reaction.
$D$ for no reaction.
$P_4 + 3NaOH + 3H_2O \longrightarrow PH_3 + 3NaH_2PO_2$
Identify the correct category for the given reaction.