i) $H_2{O}_2\stackrel{ }{\to }{H}_{2}O+\left(O\right)$

ii) $H_2{O}_2+2I^{-}\stackrel{ }{\to }{I}_2+2O{H}^{-}$ $H_2{O}_2$ acts as 

reducing agent in both (i) and (ii)

reducing agent in (i) and oxidising agent in (ii)

oxidising agent in (i) and reducing agent in (ii)

oxidising agent in both (i) and (ii)