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Oxidation and Reduction

Indicate whic...

Question

Indicate which of the substance/ion in the following reactions is an oxidising agent and which is a reducing agent?
$S O_{2} + 2 H N O_{3} \to H_{2} S O_{4} + 2 N O_{2}$ .

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Solution

$S O_{2} + 2 H N O_{3} \to H_{2} S O_{4} + 2 N O_{2}$ .
Oxidising agent- $H N O_{3}$ The oxidation number of N decreases from +5 to +4. Thus, N itself is reduced.
Reducing agent- $S O_{2}$ . The oxidation number of S increases from +4 to +6. Thus, S itself is oxidised.

Note:
Any species that is oxidised acts as reducing agent.
Any species that is reduced acts as oxidising agent.

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