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Question

A biological redox reaction always involves:
  1. All of the above.
  2. loss and gain of electrons in different chemical species.
  3. an oxidizing agent.
  4. a reducing agent.


Solution

The correct option is A 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.

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