Identify the oxidising agent (oxidant) in the following reactions.
$3 F e + 4 H_{2} O \to F e_{3} O_{4} + 4 H_{2}$ .

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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).
$3 F e + 4 H_{2} O \to F e_{3} O_{4} + 4 H_{2}$
In above reaction, water ( $H_{2} O$ ) acts as an oxidising agent as it oxidises iron $(F e)$ to form ferric(III)oxide ( $F e_{3} O_{4}$ ) and hydrogen ( $H_{2}$ ).

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Balance the following reaction

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