(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)It can be prepared by acidification of barium peroxide which is done by adding H₂SO₄. The excess water molecules then produced are evaporated under reduced pressure. The reaction for which is as follows-

BaO.8H₂O (s) + H₂SO₄ (aq) → BaSO₄(s) + H₂O₂ (aq) + 8H₂O (l)

H₂O₂ acts as an oxidizing as well as reducing agent in both acidic and alkaline medium. This can be illustrated by following examples-

A. Oxidizing action in acidic medium-

2Fe²⁺ + 2H⁺ + H₂O₂ → 2Fe³⁺ + 2H₂O

B. reducing agent in acidic medium-

2MnO₄^- + 6H⁺ + 5H₂O₂ → 2Mn²⁺ + 8H₂O + 5O₂

C. oxidizing agent in basic medium-

2Fe²⁺ + H₂O₂ → 2Fe³⁺ + 2OH^-

D. reducing agent in basic medium-

I₂ + H₂O₂ + OH^-→ 2I^- +2H₂O + O₂

(ii) Acidic property of Hydrogen peroxide-

It turns blue litmus red but its dilute solution is almost neutral to litmus which means it is a weak acid.

Its acidic nature can be further supported by its reaction with NaOH (base).

NaOH + H₂O₂ → NaHO₂ + 2H₂O

Since, H₂O₂ is a weak acid therefore CO₂ is not produced as final product.