Question:
The diagram which is plotted between standard free energy changes of various metal oxides as a function of temperature is
The diagram which is plotted between standard free energy changes of various metal oxides as a function of temperature is
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Ellingham = $\Delta G$ vs $T$. It tells you which metal can reduce another metal's oxide.
Updated On: Jul 4, 2026
- PH diagram
- Pourbaix diagram
- Predominance area diagram
- Ellingham diagram
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The Correct Option is D
Solution and Explanation
Step 1: Concept
In extractive metallurgy, graphical representations help predict the equilibrium between a metal, its oxide, and oxygen.
Step 2: Meaning
These plots show the ease of reduction of metal oxides and sulfides.
Step 3: Analysis
A Pourbaix diagram relates potential to pH. An Ellingham diagram specifically plots the change in Gibbs free energy ($\Delta G^{\circ}$) against absolute temperature ($T$).
Step 4: Conclusion
The description provided perfectly matches the definition and use of an Ellingham diagram. Final Answer: (D)
In extractive metallurgy, graphical representations help predict the equilibrium between a metal, its oxide, and oxygen.
Step 2: Meaning
These plots show the ease of reduction of metal oxides and sulfides.
Step 3: Analysis
A Pourbaix diagram relates potential to pH. An Ellingham diagram specifically plots the change in Gibbs free energy ($\Delta G^{\circ}$) against absolute temperature ($T$).
Step 4: Conclusion
The description provided perfectly matches the definition and use of an Ellingham diagram. Final Answer: (D)
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