What will be the dihedral angle present in hydrogen peroxide $\left(H_2{O}_2\right)$ in solid phase.

Q. In $H_2{O}_2$ molecule the dihedral angle in gas phase is

Q. Given below are two statements : One is labelled as Assertion A and other is labelled as Reason R.

Assertion A : The dihedral angles in $H_2{O}_2$ in gaseous phase is 90.2° and in solid phase is 111.5°.
Reason R : The change in dihedral angle in solid and gaseous phase is due to the difference in the inter molecular forces.

Choose the most appropriate answer from the options given below for A and R.

Q. In a triangle ABC, AB = AC then $\angle B=$ ______.

Q. $8.5g$ of hydrogen peroxide is present in $280mL$ of solution. The volume strength of $H_2{O}_2$ solution is