1.

From the Ellingham graph between Gibbs energy and temperature , out of C and CO which is a better reducing agent for ZnO ?A. CarbonB. COC. Both of theseD. None of these

Answer» Correct Answer - A
The free energy of formation `(DeltaG^(@))` of CO from C becomes lower at temperature above 1180 K whereas that of `CO_(2)` from C becomes lower aboveb 1270 K than `DeltaG^(@)` of ZnO. However , `DeltaG^(@)` of `CO_(2)` from CO is always higher than that of ZnO. Hence, C can reduce ZnO to Zn but not CO.


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