Which substance cannot be reduced by ${H_2O_2}$?

In which of the following reactions does hydrogen peroxide act as a reducing agent?

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 $R$.

What is the gas liberated when alkaline formaldehyde solution is treated with $H_2 O_2$?

Which of the following oxides will produce hydrogen peroxide upon reaction with dilute acid?

$12 \ V \ H_2O_2$ solution contains $680 \ g \ H_2O_2$. Then $\% \ W/V$ and volume of the solution is respectively ........ and ...........