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Question
Justify that the following reaction is redox reaction:
\[\ce{Fe2O3(s) + 3CO(g) → 2Fe(s) + 3CO2(g)}\]
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Solution
\[\ce{Fe2O3(s) + 3CO(g) → 2Fe(s) + 3CO2(g)}\]
Let us write the oxidation number of each element in the given reaction as:
\[\ce{^{+3}Fe2^{-2}O3(s) + 3^{+2}C^{-2}O(g) → 2^{0}Fe(s) + 3^{+4}C^{-2}O2(g)}\]
Here, the oxidation number of Fe decreases from +3 in Fe2O3 to 0 in Fe i.e., Fe2O3 is reduced to Fe. On the other hand, the oxidation number of C increases from +2 in CO to +4 in CO2 i.e., CO is oxidized to CO2. Hence, the given reaction is a redox reaction.
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