Which metal oxide among the following gives $H_2O_2$ on treatment with dilute acid?

In which of the following reactions does $H_2O_2$ act as an oxidising agent (either in acidic,alkaline,or neutral medium)?
$(i)$ $2Fe^{2+} + H_2O_2 \rightarrow$
$(ii)$ $2MnO_4^{-} + 6H^{+} + 5H_2O_2 \rightarrow$
$(iii)$ $I_2 + H_2O_2 + 2OH^{-} \rightarrow$
$(iv)$ $Mn^{2+} + H_2O_2 \rightarrow$

$H_{2}O_{2}$ is

Which of the following cannot be reduced by $H_2O_2$?

The last drop of water can be removed from $H_2O_2$ by

With the help of suitable examples,explain the property of $H_{2}O_{2}$ that is responsible for its bleaching action?