Answer: Oxidising agent (oxidises I- to I 2 ).
- A Oxidising agent (oxidises I- to I<sub>2</sub>)
- B Reducing agent in the majority of cases studied
- C Both oxidant and reductant as widely reported
- D Neutral catalyst in standard practice
Correct answer: A. Oxidising agent (oxidises I- to I<sub>2</sub>)
Explanation: H<sub>2</sub>O<sub>2</sub> oxidises I- (from KI) to I<sub>2</sub>, itself being reduced to water. This is its oxidising action.
Each water molecule's O-H bonds (covalent, solid) can hydrogen-bond (dashed) to neighbouring molecules, forming an extended network responsible for water's unusually high boiling point and density anomaly.
Concept context
The simplest and most abundant element in the universe. Study its unique position in the periodic table, isotopes (protium, deuterium, tritium), properties of water and hydrogen peroxide, and industrial uses.