Identify the oxidising agent (oxidant) in the following reactions.
$2 M g + O_{2} \to 2 M g O$

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Solution

An oxidising agent is the one which oxidises other substances (by removal of hydrogen or addition of oxygen) and itself gets reduced (addition of hydrogen or removal of oxygen).
$2 M g + O_{2} \to 2 M g O$
In the above reaction, oxygen acts as an oxidising agent as it oxidises magnesium $(M g)$ to form magnesium oxide $(M g O)$ .

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