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Answer:

Oxidation: A process in which an atom loses an electron and therefore increases its oxidation number. ... So oxidation reactions need not involve oxygen. This redox reaction is actually the sum of two separate half-reactions (a reduction half-reaction and an oxidation half-reaction).

Explanation:

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Oxygen is not a necessary reactant for oxidation reaction.

In chemistry oxidation is called the chemical phenomenon in which an atom, molecule or ion loses one or more electrons, thus increasing its positive charge.

As oxygen is an element that usually accepts these electrons, this type of reaction was called oxidation reactions.

  • The element that grants the electrons is known as the reducing agent and it is the one that oxidizes.

  • The oxidizing agent, on the other hand, stays with the electrons that the reducing agent releases.

  • Most cases of oxidation involve oxygen, but it can also occur in its absence.

  • Several substances are capable of oxidizing many chemical compounds, with the same and even greater ease than the oxygen [O2]; an example: ozone [O3].

  • Ozone is a toxic agent as a consequence of its strong oxidizing power and is produced in cities by the action of sunlight on nitrogen dioxide, [NO2].

Therefore, we can conclude that oxygen is not a necessary reactant for oxidation reaction.

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