Which of the following acids exhibits oxidation,reduction,and complex formation properties?

Prove that the reaction between fluorine and ice is a disproportionation reaction:
$H_{2}O_{(s)} + F_{2(g)} \to HF_{(g)} + HOF_{(g)}$

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

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

In the following reaction,assign the state for the underlined atom in the product of complete hydrolysis at $R.T.$:
$\underline{Cl}O_2 + H_2O \longrightarrow HClO_2 + HClO_3$

$Cu^{+}$ ion is not stable in aqueous solution due to: