Thermodynamics of Metallurgy
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CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321191 Although thermodynamically feasible, in practice, magnesium metal is not used for the reduction of alumina in the metallurgy of aluminium. Why?
supporting img

1 \(\mathrm{\mathrm{Mg}}\) can reduce Alumina below point \(\mathrm{\mathrm{A}}\) at temperature lower than at \(\mathrm{\mathrm{A}}\)
2 The process is uneconomical
3 Though thermodynamically feasible practically not possible
4 Both (1) and (2)
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321192 Ellingham diagram represents:

1 Change of \(\mathrm{\Delta G}\) with temperature.
2 Change of \(\mathrm{\Delta H}\) with temperature.
3 Change of \(\mathrm{\Delta G}\) with pressure.
4 Change of \(\mathrm{(\Delta G-T \Delta S)}\) with temperature.
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321193 Which of the following best explains why the free energy of formation of \(\mathrm{\mathrm{Fe}_{2} \mathrm{O}_{3}}\) becomes less negative as the temperature increases?

1 The free energy of formation is independent of the absolute temperature.
2 As entropy increases, the free energy of formation increases.
3 Entropy drops as a result of the consumption of oxygen.
4 At low temperature, the free energy of formation becomes less dependent on the enthalpy of formation.
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321194 In Ellingham diagrams of \(\mathrm{\Delta_{f} G}\) oxide formation Vs T, which of the following graphs has negative slope?

1 \(\mathrm{\mathrm{C} \rightarrow \mathrm{CO}}\)
2 \(\mathrm{\mathrm{Fe} \rightarrow \mathrm{Fe}_{2} \mathrm{O}_{3}}\)
3 \(\mathrm{\mathrm{Mg} \rightarrow \mathrm{MgO}}\)
4 All of these
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321195 Which of the following statement is correct w.r.t the following graph?
supporting img

1 Below \(\mathrm{1623 \mathrm{~K}, \mathrm{Mg}}\) reduces \(\mathrm{\mathrm{Al}_{2} \mathrm{O}_{3}}\)
2 Above \(\mathrm{1623 \mathrm{~K}, \mathrm{Al}}\) reduces \(\mathrm{\mathrm{MgO}}\)
3 Both (1) & (2) are correct
4 Both (1) & (2) are wrong
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CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321191 Although thermodynamically feasible, in practice, magnesium metal is not used for the reduction of alumina in the metallurgy of aluminium. Why?
supporting img

1 \(\mathrm{\mathrm{Mg}}\) can reduce Alumina below point \(\mathrm{\mathrm{A}}\) at temperature lower than at \(\mathrm{\mathrm{A}}\)
2 The process is uneconomical
3 Though thermodynamically feasible practically not possible
4 Both (1) and (2)
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321192 Ellingham diagram represents:

1 Change of \(\mathrm{\Delta G}\) with temperature.
2 Change of \(\mathrm{\Delta H}\) with temperature.
3 Change of \(\mathrm{\Delta G}\) with pressure.
4 Change of \(\mathrm{(\Delta G-T \Delta S)}\) with temperature.
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321193 Which of the following best explains why the free energy of formation of \(\mathrm{\mathrm{Fe}_{2} \mathrm{O}_{3}}\) becomes less negative as the temperature increases?

1 The free energy of formation is independent of the absolute temperature.
2 As entropy increases, the free energy of formation increases.
3 Entropy drops as a result of the consumption of oxygen.
4 At low temperature, the free energy of formation becomes less dependent on the enthalpy of formation.
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321194 In Ellingham diagrams of \(\mathrm{\Delta_{f} G}\) oxide formation Vs T, which of the following graphs has negative slope?

1 \(\mathrm{\mathrm{C} \rightarrow \mathrm{CO}}\)
2 \(\mathrm{\mathrm{Fe} \rightarrow \mathrm{Fe}_{2} \mathrm{O}_{3}}\)
3 \(\mathrm{\mathrm{Mg} \rightarrow \mathrm{MgO}}\)
4 All of these
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321195 Which of the following statement is correct w.r.t the following graph?
supporting img

1 Below \(\mathrm{1623 \mathrm{~K}, \mathrm{Mg}}\) reduces \(\mathrm{\mathrm{Al}_{2} \mathrm{O}_{3}}\)
2 Above \(\mathrm{1623 \mathrm{~K}, \mathrm{Al}}\) reduces \(\mathrm{\mathrm{MgO}}\)
3 Both (1) & (2) are correct
4 Both (1) & (2) are wrong
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CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321191 Although thermodynamically feasible, in practice, magnesium metal is not used for the reduction of alumina in the metallurgy of aluminium. Why?
supporting img

1 \(\mathrm{\mathrm{Mg}}\) can reduce Alumina below point \(\mathrm{\mathrm{A}}\) at temperature lower than at \(\mathrm{\mathrm{A}}\)
2 The process is uneconomical
3 Though thermodynamically feasible practically not possible
4 Both (1) and (2)
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321192 Ellingham diagram represents:

1 Change of \(\mathrm{\Delta G}\) with temperature.
2 Change of \(\mathrm{\Delta H}\) with temperature.
3 Change of \(\mathrm{\Delta G}\) with pressure.
4 Change of \(\mathrm{(\Delta G-T \Delta S)}\) with temperature.
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321193 Which of the following best explains why the free energy of formation of \(\mathrm{\mathrm{Fe}_{2} \mathrm{O}_{3}}\) becomes less negative as the temperature increases?

1 The free energy of formation is independent of the absolute temperature.
2 As entropy increases, the free energy of formation increases.
3 Entropy drops as a result of the consumption of oxygen.
4 At low temperature, the free energy of formation becomes less dependent on the enthalpy of formation.
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321194 In Ellingham diagrams of \(\mathrm{\Delta_{f} G}\) oxide formation Vs T, which of the following graphs has negative slope?

1 \(\mathrm{\mathrm{C} \rightarrow \mathrm{CO}}\)
2 \(\mathrm{\mathrm{Fe} \rightarrow \mathrm{Fe}_{2} \mathrm{O}_{3}}\)
3 \(\mathrm{\mathrm{Mg} \rightarrow \mathrm{MgO}}\)
4 All of these
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321195 Which of the following statement is correct w.r.t the following graph?
supporting img

1 Below \(\mathrm{1623 \mathrm{~K}, \mathrm{Mg}}\) reduces \(\mathrm{\mathrm{Al}_{2} \mathrm{O}_{3}}\)
2 Above \(\mathrm{1623 \mathrm{~K}, \mathrm{Al}}\) reduces \(\mathrm{\mathrm{MgO}}\)
3 Both (1) & (2) are correct
4 Both (1) & (2) are wrong
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CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321191 Although thermodynamically feasible, in practice, magnesium metal is not used for the reduction of alumina in the metallurgy of aluminium. Why?
supporting img

1 \(\mathrm{\mathrm{Mg}}\) can reduce Alumina below point \(\mathrm{\mathrm{A}}\) at temperature lower than at \(\mathrm{\mathrm{A}}\)
2 The process is uneconomical
3 Though thermodynamically feasible practically not possible
4 Both (1) and (2)
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321192 Ellingham diagram represents:

1 Change of \(\mathrm{\Delta G}\) with temperature.
2 Change of \(\mathrm{\Delta H}\) with temperature.
3 Change of \(\mathrm{\Delta G}\) with pressure.
4 Change of \(\mathrm{(\Delta G-T \Delta S)}\) with temperature.
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321193 Which of the following best explains why the free energy of formation of \(\mathrm{\mathrm{Fe}_{2} \mathrm{O}_{3}}\) becomes less negative as the temperature increases?

1 The free energy of formation is independent of the absolute temperature.
2 As entropy increases, the free energy of formation increases.
3 Entropy drops as a result of the consumption of oxygen.
4 At low temperature, the free energy of formation becomes less dependent on the enthalpy of formation.
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321194 In Ellingham diagrams of \(\mathrm{\Delta_{f} G}\) oxide formation Vs T, which of the following graphs has negative slope?

1 \(\mathrm{\mathrm{C} \rightarrow \mathrm{CO}}\)
2 \(\mathrm{\mathrm{Fe} \rightarrow \mathrm{Fe}_{2} \mathrm{O}_{3}}\)
3 \(\mathrm{\mathrm{Mg} \rightarrow \mathrm{MgO}}\)
4 All of these
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321195 Which of the following statement is correct w.r.t the following graph?
supporting img

1 Below \(\mathrm{1623 \mathrm{~K}, \mathrm{Mg}}\) reduces \(\mathrm{\mathrm{Al}_{2} \mathrm{O}_{3}}\)
2 Above \(\mathrm{1623 \mathrm{~K}, \mathrm{Al}}\) reduces \(\mathrm{\mathrm{MgO}}\)
3 Both (1) & (2) are correct
4 Both (1) & (2) are wrong
NEET DIGITAL LIBRARY
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321191 Although thermodynamically feasible, in practice, magnesium metal is not used for the reduction of alumina in the metallurgy of aluminium. Why?
supporting img

1 \(\mathrm{\mathrm{Mg}}\) can reduce Alumina below point \(\mathrm{\mathrm{A}}\) at temperature lower than at \(\mathrm{\mathrm{A}}\)
2 The process is uneconomical
3 Though thermodynamically feasible practically not possible
4 Both (1) and (2)
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321192 Ellingham diagram represents:

1 Change of \(\mathrm{\Delta G}\) with temperature.
2 Change of \(\mathrm{\Delta H}\) with temperature.
3 Change of \(\mathrm{\Delta G}\) with pressure.
4 Change of \(\mathrm{(\Delta G-T \Delta S)}\) with temperature.
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321193 Which of the following best explains why the free energy of formation of \(\mathrm{\mathrm{Fe}_{2} \mathrm{O}_{3}}\) becomes less negative as the temperature increases?

1 The free energy of formation is independent of the absolute temperature.
2 As entropy increases, the free energy of formation increases.
3 Entropy drops as a result of the consumption of oxygen.
4 At low temperature, the free energy of formation becomes less dependent on the enthalpy of formation.
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321194 In Ellingham diagrams of \(\mathrm{\Delta_{f} G}\) oxide formation Vs T, which of the following graphs has negative slope?

1 \(\mathrm{\mathrm{C} \rightarrow \mathrm{CO}}\)
2 \(\mathrm{\mathrm{Fe} \rightarrow \mathrm{Fe}_{2} \mathrm{O}_{3}}\)
3 \(\mathrm{\mathrm{Mg} \rightarrow \mathrm{MgO}}\)
4 All of these
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321195 Which of the following statement is correct w.r.t the following graph?
supporting img

1 Below \(\mathrm{1623 \mathrm{~K}, \mathrm{Mg}}\) reduces \(\mathrm{\mathrm{Al}_{2} \mathrm{O}_{3}}\)
2 Above \(\mathrm{1623 \mathrm{~K}, \mathrm{Al}}\) reduces \(\mathrm{\mathrm{MgO}}\)
3 Both (1) & (2) are correct
4 Both (1) & (2) are wrong