With respect to an ore, Ellingham diagram helps to predict the feasiblity of its

Options

A. Electrolysis
B. Zone refining
C. Vapour phase refining
D. Thermal reduction

Answer

To solve the question regarding the Ellingham diagram and its relevance to ores, we can break down the solution into clear steps:

### Step-by-Step Solution:

1. **Understanding the Ellingham Diagram**:
- The Ellingham diagram is a graphical representation that shows the temperature dependence of the stability of different metal oxides. It plots the Gibbs free energy change (ΔG) for the formation of oxides against temperature.

**Hint**: Recall that a more negative ΔG indicates a more stable compound.

2. **Role in Metal Extraction**:
- The diagram is used primarily in the context of metal extraction processes. It helps predict the conditions under which a metal oxide can be reduced to its corresponding metal.

**Hint**: Think about how the stability of metal oxides varies with temperature and how this affects reduction processes.

3. **Equilibrium Between Metal, Oxide, and Oxygen**:
- The Ellingham diagram illustrates the equilibrium between a metal, its oxide, and oxygen. By analyzing the diagram, one can determine the temperature at which a metal oxide can be reduced by a specific reducing agent.

**Hint**: Consider how the position of lines in the diagram indicates the feasibility of reduction reactions.

4. **Choosing a Reducing Agent**:
- The diagram helps in selecting an appropriate reducing agent (like carbon or carbon monoxide) for the reduction of a given metal oxide. This is crucial in the extraction process.

**Hint**: Remember that different reducing agents have different capabilities based on the temperature and stability of the oxides.

5. **Identifying the Correct Option**:
- The question asks about the feasibility of an ore with respect to the Ellingham diagram. The correct answer relates to the thermal reduction of the ore, as the diagram helps predict whether a metal oxide can be reduced thermally.

**Hint**: Look for keywords in the options that relate to reduction processes, particularly thermal reduction.

### Final Answer:
The Ellingham diagram helps to predict the feasibility of the **thermal reduction** of an ore.