$KIO _{4}+ H _{2} O _{2} \rightarrow KIO _{3}+ H _{2} O + O _{2}$
$NH _{2} OH +3 H _{2} O _{2} \rightarrow HNO _{3}+4 H _{2} O $.
From this above reaction, we can easily figure out that hydrogen peroxide is acting as reducing and oxidising agent respectively.