When white phosphorus reacts with caustic soda $(NaOH)$,$PH_3$ and $NaH_2PO_2$ are formed. This reaction is an example of what?

Assign $A, B, C, D$ from the given type of reaction.
$K_2MnO_4 + H^{+} \longrightarrow KMnO_4 + MnO_2 \downarrow$

Which of the following reactions is $NOT$ a disproportionation reaction?

When $Cl_2$ gas is passed through a hot and concentrated solution of $KOH$,which of the following compounds is formed?

Given below are two statements :
Statement $I$: $S_8$ solid undergoes disproportionation reaction under alkaline conditions to form $S^{2-}$ and $S_2O_3^{2-}$.
Statement $II$: $ClO_4^{-}$ can undergo disproportionation reaction under acidic condition.
In the light of the above statements,choose the most appropriate answer from the options given below :

Prove that the reaction between fluorine and ice is a disproportionation reaction:
$H_{2}O_{(s)} + F_{2(g)} \to HF_{(g)} + HOF_{(g)}$