1.

Consider the following Ellingham diagram for carbon Which of thefollowing statements is incorrect for the above Ellingham diagram

Answer»

Upto `710^(@)C`, the reaction of formation of `CO_(2)` is energetically more favourable but above `710^(@)C,` theformation of `CO` is preferred
Carbon can be used to reduce any metal oxide at a sufficiently high TEMPERATURE
Carbon reduces many oxides at elevated temperature because `DeltaG^(@)` VS temperature line has a negative slope
`DeltaS^(@)"["C(s)+1/2O_(2)(g)toCO(g)"]"`
`ltDeltaS^(@)[C(s)+O_(2)(g)toCO(g)]`

Solution :(d) Since, `DeltaG^(@) = DeltaH^(@)-TDELTAS^(@)`
where ,`DeltaG^(@)=`standard Gibbs' free energy of the RACTION
`DeltaS^(@)=` standard ENTROPY ofthe reaction
`DeltaH^(@)=` standard enthalpy of the reaction
T= temperature
from the above equation it is clear that `DeltaG^(@)` will be more negative when `DeltaS^(@)` is less negative (or `DeltaS^(@)` is high).


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