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

From the given reactions, identify the disproportionation reaction:
$(i) \ Cl_{2(g)} + 2KI_{(aq)} \longrightarrow 2KCl_{(aq)} + I_{2(s)}$
$(ii) \ Cl_{2(g)} + 2OH^{-}_{(aq)} \longrightarrow ClO^{-}_{(aq)} + Cl^{-}_{(aq)} + H_2O_{(l)}$
$(iii) \ Mg_{(s)} + 2HCl_{(aq)} \longrightarrow MgCl_{2(aq)} + H_{2(g)}$
$(iv) \ 2H_2O_{2(aq)} \longrightarrow 2H_2O_{(l)} + O_{2(g)}$

In the following reaction,$4P + 3KOH + 3H_2O \to 3KH_2PO_2 + PH_3$,what happens to phosphorus $(P)$?

The main products $P$ and $Q$ of the following unbalanced disproportionation reaction are:
$Se_2Cl_2 \rightarrow P + Q$

Which among the following species does not show a disproportionation reaction?

Fluorine reacts with ice and results in the change: $H_2O_{(s)} + F_{2(g)} \to HF_{(g)} + HOF_{(g)}$. Justify that this reaction is a redox reaction.