Question

1. what distinguishes an oxidation - reduction reaction from other types of reactions?

options:
formation of h+ and oh - ions
production of a gas
change in electron transfer between species
creation of a precipitate

Explanation:

Oxidation-reduction (redox) reactions are defined by the transfer of electrons between reactant species. Other reaction types (like acid-base, precipitation, gas-forming reactions) do not involve this electron transfer as their defining feature.

Answer:

Change in electron transfer between species