Identify the oxidising agent in the following reaction.
${2Mg(s) +O}_{2} (g) Heat - -- \to 2MgO(s)$

Mg

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O_{2}

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Both

Mg

and

O_{2}

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MgO

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Solution

The correct option is B $O_{2}$
An oxidising agent or oxidant is a substance which:

$∙$ Supplies oxygen or any other electronegative element
$∙$ Removes hydrogen or any other electropositive element
$∙$ Undergoes reduction in the chemical reaction.

Here $Mg$ is oxidised by $O_{2}$ and $O_{2}$ is being reduced. Therefore, $O_{2}$ is the oxidising agent.

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