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Question

Which substance/ion is oxidised and which substance/ion is reduced in the following reaction?
H2S+2FeCl32FeCl2+2HCl+S.

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Solution

H2S+2FeCl32FeCl2+2HCl+S.
Oxidised: H2S The oxidation number of S increases from -2 to 0. Thus, S 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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