The key characteristic of oxidation- reduction reaction is electrons are exchanged ( answer C)
Explanation
- Oxidation-reduction reaction is type of reaction that involve a transfer of electrons between two species.
Example of oxidation - reduction reaction is
CH4 +2O2 → CO2 + 2H2O
from reaction above C atom is oxidized from oxidation state -4 to 4.
On the other hand O atoms are reduced from oxidation state of 0 to 2-. therefore there is exchange of electrons between C atoms and O atoms.
.
