The reaction $2Cu^{+} \rightarrow Cu + Cu^{2+}$ is called:

In the reaction $P_4 + 3KOH + 3H_2O \to PH_3 + 3KH_2PO_2$,phosphorus is .........

What is the equivalent weight of $H_3PO_3$ in the following disproportionation reaction?
$4H_3PO_3 \rightarrow 3H_3PO_4 + PH_3$

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

What is meant by 'disproportionation'? Give two examples of disproportionation reactions in aqueous solution.

Assign $A, B, C, D$ from the given type of reaction.
$I_2 + 2NaOH \longrightarrow NaI + NaOI + H_2O$