AP BIOLOGY

Detailed explanation-1: -In simple words, an oxidizing agent is one that is reduced in a redox reaction by gaining electrons. When a molecule is said to be reduced, one or more electrons are gained by it. It means it has more electrons, so more energy. Therefore, the correct option is c.

Detailed explanation-2: -The atom or molecule that donates electrons (in this case, magnesium) is called the reducing agent, because its donation of electrons allows another molecule to become reduced.

Detailed explanation-3: -As such, electron-transfer reactions are also called oxidation-reduction reactions, or simply redox reactions. The atom that loses electrons is oxidized, and the atom that gains electrons is reduced.

Detailed explanation-4: -An electron acceptor is an oxidizing agent and is itself reduced during the process of redox reaction. Examples of acceptors include oxygen, nitrate, iron (III), manganese (IV), sulfate, carbon dioxide, etc. Synonym: oxidant, oxidizing agent. See also: redox reaction, electron transport chain.

Detailed explanation-5: -Also known as the electron acceptor, the oxidizing agent is normally in one of its higher possible oxidation states because it will gain electrons and be reduced. Examples of oxidizing agents include halogens, potassium nitrate, and nitric acid.