Which anion can undergo both oxidation and reduction?

The reaction of $ClO_2$ with $NaOH$ gives a mixture of ..........

Which of the following substances acts as an oxidising as well as a reducing agent?

Which of the following ionic or molecular species does not disproportionate in water at room temperature?

The reaction occurring when $Cl_2$ gas is passed through a concentrated solution of $NaOH$ is called .....

Observe the following reaction:
$Cl_{2(g)} + 2OH^{-}_{(aq)} \rightarrow ClO^{-}_{(aq)} + Cl^{-}_{(aq)} + H_2O_{(l)}$
Identify the correct statements about this reaction:
$I$. $Cl_{2(g)}$ is oxidized to $ClO^{-}_{(aq)}$
$II$. $Cl_{2(g)}$ is oxidized to $Cl^{-}_{(aq)}$
$III$. $Cl_{2(g)}$ is reduced to $ClO^{-}_{(aq)}$
$IV$. $Cl_{2(g)}$ is reduced to $Cl^{-}_{(aq)}$
The correct answer is: