At a temperature above 1073 K, coke can be used to reduce FeO to Fe. It can be best explained by:

1. Ellingham diagram.

2. Orgel diagram.

3. Tunabo-Sugano diagram.

4. Born-Haber cycle.

Subtopic:  Ellingham Diagram |
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The thermodynamic property useful for selecting the reducing agent is:

1. Gibbs free energy change .

2. Internal energy change.

3. Specific heat capacity.

4. None of the above.

Subtopic:  Ellingham Diagram |
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Consider the Ellingham diagram given below.

The Y-axis, and X-axis in the graph are respectively:

1. Gibbs energy($$\Delta G_{r}^{o}$$), and Pressure
2. Gibbs energy ($$\Delta G_{r}^{o}$$), and temperature
3. Enthalpy($$\Delta H_{r}^{o}$$), and temperature
4. Temperature, and Gibbs energy ($$\Delta H_{r}^{o}$$

Subtopic:  Ellingham Diagram |
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The correct statement among the following is:

 1 In the decomposition of oxide into oxygen and gaseous metal, entropy increases. 2 Decomposition of oxide is an endothermic change. 3 To make ∆G° negative, the temperature should be high enough so that T∆S° > ∆H°. 4 All of the above.

Subtopic:  Ellingham Diagram |
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Ellingham's diagram for the formation of ${\mathrm{CO}}_{2}$ is a straight line in the given graph. This is due to:

1. Increase in entropy during ${\mathrm{CO}}_{2}$ formation.

2. Decrease in entropy during ${\mathrm{CO}}_{2}$ formation.

3. Entropy remains constant during ${\mathrm{CO}}_{2}$ formation.

4. Can not be predicted.

Subtopic:  Ellingham Diagram |
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A metal's oxide that can be reduced by Fe as a reducing agent at a temperature ${T}_{1}$ is:

1. Zr

2. Ca

3. Mg

4. None of the above.

Subtopic:  Ellingham Diagram |
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The correct statement among the following is:

 1 The rate of reaction cannot be understood from the Ellingham diagram. 2 During the formation of metal oxide $$\Delta S$$ becomes negative and $$\Delta G$$ becomes positive resulting in a positive slope. 3 There is an abrupt change in the slope of the Ellingham line when a change in phase (s→l) or (l→g) takes place. 4 All of the above.

Subtopic:  Ellingham Diagram |
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Al can reduce MgO under the following conditions:

1. Above 500 °C, Al can reduce MgO

2. Below 500 °C, Al can reduce MgO

3. Below 1350 °C, Al can reduce MgO

4. Above 1350 °C, Al can reduce MgO

Subtopic:  Ellingham Diagram |
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Which of the following has a negative slope?

1. C CO

2. Fe Fe2O3

3. Mg MgO

4. All of the above

Subtopic:  Ellingham Diagram |
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Consider the following graph.

At 1400 oC, the $$\Delta G_{r}^{o}$$ the value for the reaction
2FeO + 2C → 2Fe + CO is

1. -116 kJ mol-1
2. -106 kJ mol-1
3. 100 kJ mol-1
4. -100 kJ mol-1

Subtopic:  Ellingham Diagram |
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