Identify the reducing agent in the following chemical equation.
$4 N H_{3} + 5 O_{2} \to 4 N O + 6 H_{2} O$

[1 mark]

O_{2}

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H_{2} O

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NO

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{NH}_{3}

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Solution

The correct option is D ${NH}_{3}$
Reducing agents reduce other substances in the reaction while themselves get oxidised. In the given reaction, ${N H}_{3}$ acts as a reducing agent as it reduces oxygen (charge on O is zero) to water molecules (charge on O is -2).
Here, the reducing agent is ${N H}_{3}$ .

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The catalyst used in $4 N H_{3} + 5 O_{2} ⟶ 4 N O + 6 H_{2} O$ is___________.

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