$P_4 + 3NaOH + 3H_2O \to 3NaH_2PO_2 + PH_3$ is an example of

Which of the following species do not show disproportionation reaction and why?
$ClO^{-}, ClO_{2}^{-}, ClO_{3}^{-}$ and $ClO_{4}^{-}$
Also write the reaction for each of the species that disproportionates.

Consider the following reaction,
$3Br_2 + 6CO_3^{2-} + 3H_2O \longrightarrow 5Br^{-} + BrO_3^- + 6HCO_3^-$
Which of the following statements is true regarding this reaction?

In the following reaction,assign the state for the underlined atom in the products of complete hydrolysis at $R.T.$:
$\underline{N_2}O_4 + H_2O \longrightarrow HNO_3 + HNO_2$

Which of the following reactions are disproportionation reactions?
$(A)$ $2 Cu^{+} \rightarrow Cu^{2+} + Cu$
$(B)$ $3 MnO_4^{2-} + 4 H^{+} \rightarrow 2 MnO_4^{-} + MnO_2 + 2 H_2 O$
$(C)$ $2 KMnO_4 \rightarrow K_2 MnO_4 + MnO_2 + O_2$
$(D)$ $2 MnO_4^{-} + 3 Mn^{2+} + 2 H_2 O \rightarrow 5 MnO_2 + 4 H^{+}$
Choose the correct answer from the options given below:

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