The environmentally friendly chemical used nowadays for bleaching paper in the presence of a suitable catalyst is

The reaction $H_2S + H_2O_2 \to S + 2H_2O$ manifests:

Which of the following is a true structure of $H_2O_2$?

Among the statements $(a) - (d)$,the correct ones are:
$(a)$ Decomposition of hydrogen peroxide gives dioxygen.
$(b)$ Like hydrogen peroxide,compounds such as $KClO_{3}$,$Pb(NO_{3})_{2}$,and $NaNO_{3}$ liberate dioxygen when heated.
$(c)$ $2$-Ethylanthraquinone is useful for the industrial preparation of hydrogen peroxide.
$(d)$ Hydrogen peroxide is used for the manufacture of sodium perborate.

What is the volume strength of a $3.0 \ N$ $H_2O_2$ solution in liters?

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