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Question

Which of the following shows oxidation?

The correct answer is

Addition of oxygen

In the classical definition, oxidation is the addition of oxygen to a substance or the removal of hydrogen from it, e.g. 2Cu + O2 → 2CuO.

In electronic terms, oxidation is the loss of electrons.

Addition of hydrogen, loss of oxygen and gain of electrons all describe reduction, the opposite process.

Hence, Addition of oxygen.

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