Question

A biological redox reaction always involves:

• A. loss and gain of electrons in different chemical species.
• B. an oxidizing agent.
• C. a reducing agent.
• D. All of the above.

Answer 1

The correct option is D All of the above.

An oxidation-reduction (redox) reaction is a type of chemical reaction that involves a transfer of electrons between two species.
The chemical species from which the electron is removed is said to be reducing agent, while the chemical species to which the electron is added is said to be oxidising agent.
Therefore a redox reaction invovles loss and gain of electrons between a reducing agent and an oxidising agent.