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Question

Which substance/ion is oxidised and which substance/ion is reduced in the following reaction?
2I+Cl22Cl+I2.

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Solution

2I+Cl22Cl+I2.
Oxidised- I The oxidation number of I increases from -1 to 0. Thus, I itself is oxidised and acts as reducing agent.
Reduced- Cl2. The oxidation number of Cl decreases from 0 to -1. Thus, Cl itself is reduced and acts as oxidising agent.

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

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