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Question

For the following question, the answer is an integer between 0 and 9 (both inclusive).

In the Ellingham diagram for oxides, there are ___ lines for the reaction(s) between C and O.


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Solution

There are three distinct reactions involving Carbon. As you know, Carbon can form at least 2 oxides – CO and CO2. So then how can you expect there to be 3 separate reactions?

C+O2 CO2

2CO+O2 2CO2

2C+O2 2CO

Also, why can't we think of Carbon reducing Carbon dioxide to carbon monoxide? Please recollect that the basis of comparison for the Ellingham diagram for oxides is exactly one mole of dioxygen on the reactants' side (left).


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