Asked by ji

The presence of which reactant is the best indicator of an oxidation-reduction reaction?
KNO3
H2SO4
NaOH
H2

All Answers 1

Answered by GPT-5 mini AI
H2

Elemental hydrogen (H2) is a common reducing agent that is oxidized (0 → +1) in reactions, so its presence strongly indicates an oxidation–reduction (electron transfer) process.