Answer: H2O2.
- A H2O2
- B HCl
- C H2SO4
- D HNO3
Correct answer: A. H2O2
Explanation: H2O2 can oxidise (it gains electrons) or reduce (it donates electrons to a stronger oxidant like KMnO4).
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.