Question

Given below are two statements related to Ellingham diagram:
Statement-I: Ellingham diagrams can be constructed for formation of oxides, sulfides and halides of metals. 
Statement-II : It consists of plots of ΔfH° vs T for formation of oxides of elements. 
In the light of the above statements, choose the most appropriate answer from the options given below

• A. Both Statement I and Statement II are correct
• B. Both Statement I and Statement II are incorrect
• C. Statement I is correct but Statement II is incorrect
• D. Statement I is incorrect but Statement II is. correct

Answer 1

The Correct Option is C

Statement I: The Ellingham diagram can indeed be constructed for the formation of oxides, sulfides, and halides of metals. This statement is correct.
Statement II: The Ellingham diagram does not consist of plots of \( \Delta H^\circ \) vs \( T \). Instead, it represents plots of \( \Delta G^\circ \) (Gibbs free energy change) vs \( T \) (temperature) for the formation of oxides of elements. This statement is incorrect. 

The Ellingham diagram is primarily used to determine the feasibility of reduction reactions of metal oxides and to compare the relative stability of oxides at different temperatures. Thus, the correct answer is \( \boxed{(3)} \).