In the reaction $3I_2 + 6NaOH \to NaIO_3 + 5NaI + 3H_2O$,which substance acts as the oxidizing agent?

Refer to the periodic table and answer the following questions:
$(a)$ Select the possible non-metals that can show disproportionation reaction.
$(b)$ Select three metals that can show disproportionation reaction.

$Cu^{+}$ ion is not stable in aqueous solution,because it shows $-$

Which of the following does not show a disproportionation reaction?

Which of the following chemical substances undergoes self-oxidation and self-reduction during the same reaction?

Which of the following are disproportionation reactions?
$(A)$ $2 NO_{2(g)} + 2 NaOH_{(aq)} \rightarrow NaNO_{2(aq)} + NaNO_{3(aq)} + H_2O_{(l)}$
$(B)$ $Cl_{2(g)} + 2 NaOH_{(aq)} \rightarrow NaClO_{(aq)} + NaCl_{(aq)} + H_2O_{(l)}$
$(C)$ $3 ClO^- \rightarrow 2 Cl^- + ClO_3^-$
$(D)$ $3 Mg_{(s)} + N_{2(g)} \rightarrow Mg_3N_{2(s)}$