The compound that can work both as an oxidising and reducing agent is

Given below are two statements:
Statement $I$: Hydrogen peroxide can act as an oxidizing agent in both acidic and basic conditions.
Statement $II$: Density of hydrogen peroxide at $298 \ K$ is lower than that of $D_2O$.
In the light of the above statements,choose the correct answer from the options.

The amount of $H_2O_2$ present in $1 \ L$ of $1.5 \ N$ $H_2O_2$ solution is ........... $g$.

Assertion: The $O-O$ bond length in $H_2O_2$ is shorter than that of $O_2F_2$.
Reason: $H_2O_2$ is an ionic compound.

The normality of $10$ $V$ (volume) hydrogen peroxide is:

Decolourisation of acidified potassium permanganate occurs when $H_2O_2$ is added to it,this is due to