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

The volume of oxygen liberated from $15 \, mL$ of $20$ volume $H_2O_2$ is ................ $mL$.

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

In which of the following reactions does $H_2O_2$ act as a reductant?

Given below are two statements:
Statement $I$: $H_{2}O_{2}$ can act as both an oxidising and a reducing agent in a basic medium.
Statement $II$: In the hydrogen economy,the energy is transmitted in the form of dihydrogen.
In the light of the above statements,choose the correct answer from the options given below:

Which of the following reactions is incorrect?