In which of the following reactions is $H_2O_2$ acting as a reducing agent?

Given below are two statements :
Statement $I$ : $H_2O_2$ is used in the synthesis of Cephalosporin.
Statement $II$ : $H_2O_2$ is used for the restoration of aerobic conditions to sewage wastes.
In the light of the above statements,choose the most appropriate answer from the options given below :

Which of the following cannot be reduced by $H_2O_2$?

Which of the following can reduce the decomposition of $H_2O_2$ on exposure to light?

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.

The strength of $50$ volume solution of hydrogen peroxide is $...... \ g/L$ (Nearest integer). Given: Molar mass of $H_2O_2$ is $34 \ g \ mol^{-1}$. Molar volume of gas at $STP = 22.7 \ L$.