Acidified solution of chromic acid on treatment with hydrogen peroxide yields:

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 $R$.

Calculate the molarity and $\% \ W/V$ of $40$ volume of $H_2O_2$ solution.

With the help of suitable examples,explain the property of $H_{2}O_{2}$ that is responsible for its bleaching action?

Which of the following yields $H_2O_2$ upon oxidation?

In $H_2O_2$ molecule,the dihedral angle between the two $O-H$ planes is ............. $^o$.