Question

Oxidation
in any change involving
in oxidation number
​

Answer 1

The increase in oxidation state of an atom, through a chemical reaction, is known as an oxidation; a decrease in oxidation state is known as a reduction. Such reactions involve the formal transfer of electrons: a net gain in electrons being a reduction, and a net loss of electrons being an oxidation.

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Answer 2

oxidation is gain of oxygen and loss of hydrogen.In terms of electron transfer it is loss of electrons.

eg-

2Mg+O2 gives 2MgO