$H_2O_2$ cannot oxidise

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

$H_2O_2$ restores the color of old lead paintings,blackened by the action of $H_2S$ gas by:

$H_2O_2$ is always stored in wax-lined black bottles because:

$A$ commercial sample of $H_2O_2$ marked as $100$ volume hydrogen peroxide means:

$A$ commercial sample of $H_{2}O_{2}$ is labeled as $10 \text{ V}$. Its percentage strength is nearly: