What is oxidation?

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When a substance comes into contact with oxygen, a chemical reaction occurs.

When a substance comes into contact with nitrogen, a chemical reaction occurs.

When a substance comes into contact with hydrogen, a chemical reaction occurs.

When a substance comes into contact with water, a chemical reaction occurs.

answer is A.

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Detailed Solution

Originally, the term oxidation was used to describe reactions in which an element combines with oxygen.

For example- $C + O_{2} \to {CO}_{2}$

Hence, When a substance comes into contact with oxygen, a chemical reaction occurs.

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