(i) Give a method for the manufacture of hydrogen peroxide and explain the reactions involved therein. (ii) Illustrate oxidising, reducing and acidic properties of hydrogen peroxide with equations.

(i) Give a method for the manufacture of hydrogen peroxide and explain

1.	(i) Give a method for the manufacture of hydrogen peroxide and explain the reactions involved therein. (ii) Illustrate oxidising, reducing and acidic properties of hydrogen peroxide with equations.
Answer» Solution :Industrially it is prepared by the auto-oxidation of 2-alklylanthraquinols. (2-ethyl anthraquinol) `underset(H_2//Pd)overset(O_2 "(air)") to H_2O_2` + (Oxidised product.) In this case 1% `H_2O_2` is formed. It is extracted with water and concentrated to ~30% (by mass) by distillation under reduced pressure. It can be further concentrated to ~85% by careful distillation under low pressure. The remaining water can be frozen out to OBTAIN PURE `H_2O_2`. (i)OXIDISING effect in acidic medium : `2Fe_((aq))^(2+) + 2H_((aq))^(+) + H_2O_(2(aq)) + H_2O_(2(aq)) to 2Fe_((aq))^(3+) + 2H_2O_((L))` `PbS_((s)) + 4H_2O_(2(aq)) to PbSO_(4(s)) + 4H_2O_((l))` (ii) Reducing effect in acidic medium : `2MnO_4^(-) + 6H^(+) + 5H_2O_2 to 2Mn_((aq))^(2+) + 8H_2O + 5O_2` `HOCl + H_2O_2 to H_3O^(+) + Cl^(-) + O_2` (iii) Oxidising effect in BASIC medium : `2Fe^(2+) + H_2O_2 to 2Fe^(3+) + 2OH^(-)` `Mn^(2+) + H_2O_2 to Mn^(4+) + 2OH^(-)` (iv) Reducing effect in basic medium : `I_2+H_2O_2 + 2OH^(-) to 2I^(-) + 2H_2O + O_2` `2MnO_4^(-) + 3H_2O_2 to 2MnO_2 + 3O_2 + 2H_2O + 2OH^(-)`