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Question

Which substance/ion is oxidised and which substance/ion is reduced in the following reaction?
SnCl2+2FeCl3SnCl4+2FeCl2.

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Solution

SnCl2+2FeCl3SnCl4+2FeCl2.
Oxidised- SnCl2 The oxidation number of Sn increases from +2 to +4. Thus, Sn itself is oxidised and acts as reducing agent.
Reduced- FeCl3. The oxidation number of Fe decreases from +3 to +2. Thus, Fe 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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