$A$ commercial sample of hydrogen peroxide is labeled as $10$ volume. Its percentage concentration is approximately ............... $\%$.

Given below are two statements: One is labelled as Assertion $A$ and the other is labelled as Reason $R.$
Assertion $A:$ The dihedral angle in $H_{2}O_{2}$ in the gaseous phase is $90.2^{\circ}$ and in the solid phase is $111.5^{\circ}$.
Reason $R:$ The change in dihedral angle in the solid and gaseous phases is due to the difference in the intermolecular forces.
Choose the most appropriate answer from the options given below for $A$ and $R$.

Which is not a method to prepare $H_2O_2$?

In which of the following reactions is hydrogen peroxide $(H_2O_2)$ a reducing agent?

What is the amount of $H_2O_2$ in grams present in $1 \ L$ of $1.5 \ N$ $H_2O_2$ solution?

Decomposition of $H_2O_2$ is prevented by