Discuss, with relevant chemical equations, various methods of preparing hydrogen peroxide. Which of these methods is useful to prepare `D_(2)O_(2)`?

Explanation

Preparations of `H_(2)O_(2)` :
i) From Acidified `BaO_(2)` removing the excess of water by evaporation under reduced pressure gives `H_(2)O_(2)`.
`BaO_(2)*8H_(2)O_((s))+H_(2)SO_(4(aq))toBaSO_(4(s))+H_(2)O_(2(aq))+8H_(2)O_((l))`
ii) Auto oxidation method : `H_(2)O_(2)` is prepared industrially by the auto oxidation of 2-ethy anthraquinol.

iii) Electrolysis of peroxo disulphuric acid : `H_(2)O_(2)` is obtained by the electrolysis of 50% `H_(2)SO_(4)` solution, peroxo disulphuric acid obtained undergo hydrolysis to form `H_(2)O_(2)`.
`2HSO_(4(aq))^(-)toH_(2)S_(2)O_(8(aq))overset("Hydrolysis")to2HSO_(4(aq))^(-)+2H_((aq))^(+)+H_(2)O_(2(aq))`
Preparation of `D_(2)O_(2):D_(2)O_(2)` is obtained by the reaction of `K_(2)S_(2)O_(8)` with heavy water. This is similar to above method (iii).
`K_(2)S_(2)O_(8(s))+2D_(2)O_((l))to2KDSO_(4(aq))+D_(2)O_(2(l))`