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प्रश्न
Out of C and CO, which is a better reducing agent at 673 K?
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उत्तर
Out of C and CO, CO is a better reducing agent at 673 K. This can be explained as follows.
The CO, CO2 curve slopes upward in the Ellingham diagram, while the C, CO2 curve is nearly flat. At 673 K, the two curves intersect. Lower than 673 K, the response \[\ce{C_{(s)} + O2_{(g)} -> CO2_{(g)}}\] is energetically less favourable due to a lesser negative value of ΔfG° as compared to that for the reaction \[\ce{2CO_{(g)} + O2_{(g)} -> 2CO2_{(g)}}\] which has a more negative value. Therefore, below 673 K, CO acts as a better reducing agent.
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