When $2-$ethylanthraquinol dissolved in a mixture of benzene and cyclohexanol is oxidised,the product is

Write one chemical reaction for the preparation of $D_2O_2$.

The structure of $H_2O_2$ is

$H_2O_2$ restores the color of old lead paintings,blackened by the action of $H_2S$ gas by:

The compound which does not possess a peroxide linkage is

Consider the following reaction:
$2 HSO_{4}^{-}(aq)$ $\xrightarrow[\text{(2) Hydrolysis}]{\text{(1) Electrolysis}} H_{2}S_{2}O_{8}(aq)$ $\xrightarrow{\text{Hydrolysis}} 2 HSO_{4}^{-}(aq) + 2 H^{+}(aq) + A(aq)$
The dihedral angle in product $A$ in its solid phase at $110 \ K$ is ....$^{\circ}$