What is the $\%$ strength of $22.4$ volume of $H_2O_2$ solution (in $\%$)?

On shaking $H_2O_2$ with acidified potassium dichromate and ether,the ethereal layer becomes:

The $pH$ of a solution of $H_2O_2$ is $6.0$. Some chlorine gas is bubbled into this solution. Which of the following is correct?

Phosphoric acid is preferred over sulphuric acid in preparing hydrogen peroxide from peroxides. Why?

Predict the correct product when $Cl_2$ is passed through a $H^{18}O-^{18}OH$ solution.

$O_2F_2$ is an unstable yellow-orange solid and $H_2O_2$ is a colourless liquid. Both have an $O-O$ bond. The $O-O$ bond length in $H_2O_2$ and $O_2F_2$ respectively is: