What is the order of the $K_a$ value for $H_2O_2$?

The correct statements about $H_2O_2$ are:
$A$. Used in the treatment of effluents.
$B$. Used as both oxidising and reducing agents.
$C$. The two hydroxyl groups lie in the same plane.
$D$. Miscible with water.
Choose the correct answer from the options given below:

The strengths of $5.6$ volume hydrogen peroxide (of density $1 \ g/mL$) in terms of mass percentage and molarity $(M)$,respectively,are:
(Take molar mass of hydrogen peroxide as $34 \ g/mol$)

Identify the correct statement about $H_2O_2$.

The covalent radius of oxygen is measured in:

Calculate the strength of $20 \ V$ $H_2O_2$ in $g/L$.