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Question
Explain the following:
\[\ce{CO2}\] is a better reducing agent below 710 K whereas \[\ce{CO}\] is a better reducing agent above 710 K.
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Solution
To Ellingham diagram, at temperature below 710 K,
\[\ce{ΔG^Θ_{(C, CO_2)} < ΔG^Θ_{(C, CO)}}\] hence \[\ce{CO2}\] is better reducing agent.
At temperature above 710 K, \[\ce{ΔG^Θ_{(C, CO_2)} < ΔG^Θ_{(C, CO)}}\] hence \[\ce{CO}\] is better reducing agent.
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