2FeSO4 ---------- Fe2O3(s) + SO2(g) + SO3(g). Is it a redox reaction or not? if yes, why?

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Solution

Yes.
In this reaction the oxidation number of Fe changes from +2 to +3, thus gets oxidised
Whereas the oxidation no. of S changes from +6 to +4 (SO₂) thus gets reduced.

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