$H_2O_2$ is a

Calculate the percentage by mass of a $H_2O_2$ solution that is $67.2$ volume strength.

What is the $O-O-H$ bond angle in the solid form of $H_2O_2$ (in $^{\circ}$)?

Which of the following produces $H_2O_2$ on hydrolysis?

With reference to the redox properties of hydrogen peroxide $(H_2O_2)$,which of these reactions are feasible?
$(I)$ $2Fe^{2+} + 2H^{+} + H_2O_2 \longrightarrow 2Fe^{3+} + 2H_2O$
$(II)$ $2MnO_4^{-} + 6H^{+} + 5H_2O_2 \longrightarrow 2Mn^{2+} + 8H_2O + 5O_2$
$(III)$ $2Fe^{2+} + H_2O_2 \longrightarrow 2Fe^{3+} + 2OH^{-}$
$(IV)$ $2MnO_4^{-} + 3H_2O_2 \longrightarrow 2MnO_2 + 2H_2O + 3O_2 + 2OH^{-}$

Which method is currently used for the industrial production of $H_2O_2$?