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Question
Identify the redox reactions out of the following reactions and identify the oxidising and reducing agents in them.
\[\ce{Fe2O3 (s) + 3CO (g) ->[Δ] 2Fe (s) + 3CO2 (g)}\]
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Solution
\[\ce{F\overset{+3}{e2}\overset{-2}{O3} (s) + 3\overset{+2}{C}\overset{-2}{O (g)} ->[Δ] \overset{0}{2F}e (s) + \overset{+4}{3C}\overset{-2}{O2} (g)}\]
Here, O.N. of \[\ce{Fe}\] decreases from +3 (in \[\ce{Fe2O3}\]) to 0 (in \[\ce{Fe}\]) and therefore, \[\ce{Fe2O3}\] acts as an oxidizing agent.
O.N. of \[\ce{C}\] increases from +2 (in \[\ce{CO}\]) to +4 (in \[\ce{CO2}\]) and therefore, \[\ce{CO}\] acts as a reducing agent. Thus, this is a redox reaction.
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