The choice of reducing agent for metal oxide is decided by thermodynamic principles of metallurgy. Delta G must be negative. Ellingham diagram is a plot of Delta_(f)G^(0) vs T for the formation of oxides of various elements. All the plots slope upwards when temperature increases. Each plot is a straight line except when some change in phase takes place. A metal will reduce the oxide of other metals which lie above it in this diagram. Delta G^(0) vs T plot in the Ellingham's diagram slopes downward for the reaction.

The choice of reducing agent for metal oxide is decided by thermodynam

1.	The choice of reducing agent for metal oxide is decided by thermodynamic principles of metallurgy. Delta G must be negative. Ellingham diagram is a plot of Delta_(f)G^(0) vs T for the formation of oxides of various elements. All the plots slope upwards when temperature increases. Each plot is a straight line except when some change in phase takes place. A metal will reduce the oxide of other metals which lie above it in this diagram. Delta G^(0) vs T plot in the Ellingham's diagram slopes downward for the reaction.
Answer» `MG + (1)/(2)O_(2) rarr MgO` `2Ag + (1)/(2) O_(2) rarr Ag_(2)O` `C + (1)/(2) O_(2) rarr CO` `CO + (1)/(2) O_(2) rarr CO_(2)` Answer :C