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

321200 The relative stability of the metal oxides is \(\mathrm{\mathrm{CaO} < \mathrm{MgO} < \mathrm{Al}_{2} \mathrm{O}_{3} < \mathrm{Cr}_{2} \mathrm{O}_{3}}\).
The most stable metal among the following is

1 \(\mathrm{\mathrm{Ca}}\)
2 \(\mathrm{\mathrm{Mg}}\)
3 \(\mathrm{\mathrm{Al}}\)
4 \(\mathrm{\mathrm{Cr}}\)
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321201 Which metal has a greater tendency to form metal oxide?

1 \(\mathrm{\mathrm{Cr}}\)
2 \(\mathrm{\mathrm{Ca}}\)
3 \(\mathrm{\mathrm{Al}}\)
4 \(\mathrm{\mathrm{Fe}}\)
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321202 \(\mathrm{\Delta G^{o}}\) vs \(\mathrm{T}\) plot in the Ellingham's diagram slope is downward for the reaction

1 \(\mathrm{\mathrm{Mg}+\dfrac{1}{2} \mathrm{O}_{2} \rightarrow \mathrm{MgO}}\)
2 \(\mathrm{\dfrac{4}{3} \mathrm{Al}+\mathrm{O}_{2} \rightarrow \dfrac{2}{3} \mathrm{Al}_{2} \mathrm{O}_{3}}\)
3 \(\mathrm{\mathrm{C}+\dfrac{1}{2} \mathrm{O}_{2} \rightarrow \mathrm{CO}}\)
4 \(\mathrm{\mathrm{CO}+\dfrac{1}{2} \mathrm{O}_{2} \rightarrow \mathrm{CO}_{2}}\)
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321203 Consider the following reactions at \(\mathrm{1000^{\circ} \mathrm{C}}\),
(i) \({\rm{ Zn(s) + }}\frac{{\rm{1}}}{{\rm{2}}}{{\rm{O}}_{\rm{2}}}{\rm{(g)}} \to {\rm{ZnO(s);\Delta }}{{\rm{G}}^{\rm{o}}}{\rm{ = - 360}}\;{\rm{kJ/mol}}\)
(ii) \({\rm{C(s) + }}\frac{{\rm{1}}}{{\rm{2}}}{{\rm{O}}_{\rm{2}}}{\rm{(g)}} \to {\rm{CO(g);\Delta }}{{\rm{G}}^{\rm{o}}}{\rm{ = - 460}}\;{\rm{kJ/mol}}\)
then choose the correct statement from the following:

1 Zinc can be oxidised by \(\mathrm{\mathrm{CO}}\)
2 \(\mathrm{\mathrm{ZnO}}\) can be reduced by \(\mathrm{\mathrm{C}}\)
3 \(\mathrm{\mathrm{ZnO}}\) can be reduced by \(\mathrm{\mathrm{CO}}\)
4 None of the above
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CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321200 The relative stability of the metal oxides is \(\mathrm{\mathrm{CaO} < \mathrm{MgO} < \mathrm{Al}_{2} \mathrm{O}_{3} < \mathrm{Cr}_{2} \mathrm{O}_{3}}\).
The most stable metal among the following is

1 \(\mathrm{\mathrm{Ca}}\)
2 \(\mathrm{\mathrm{Mg}}\)
3 \(\mathrm{\mathrm{Al}}\)
4 \(\mathrm{\mathrm{Cr}}\)
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321201 Which metal has a greater tendency to form metal oxide?

1 \(\mathrm{\mathrm{Cr}}\)
2 \(\mathrm{\mathrm{Ca}}\)
3 \(\mathrm{\mathrm{Al}}\)
4 \(\mathrm{\mathrm{Fe}}\)
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321202 \(\mathrm{\Delta G^{o}}\) vs \(\mathrm{T}\) plot in the Ellingham's diagram slope is downward for the reaction

1 \(\mathrm{\mathrm{Mg}+\dfrac{1}{2} \mathrm{O}_{2} \rightarrow \mathrm{MgO}}\)
2 \(\mathrm{\dfrac{4}{3} \mathrm{Al}+\mathrm{O}_{2} \rightarrow \dfrac{2}{3} \mathrm{Al}_{2} \mathrm{O}_{3}}\)
3 \(\mathrm{\mathrm{C}+\dfrac{1}{2} \mathrm{O}_{2} \rightarrow \mathrm{CO}}\)
4 \(\mathrm{\mathrm{CO}+\dfrac{1}{2} \mathrm{O}_{2} \rightarrow \mathrm{CO}_{2}}\)
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321203 Consider the following reactions at \(\mathrm{1000^{\circ} \mathrm{C}}\),
(i) \({\rm{ Zn(s) + }}\frac{{\rm{1}}}{{\rm{2}}}{{\rm{O}}_{\rm{2}}}{\rm{(g)}} \to {\rm{ZnO(s);\Delta }}{{\rm{G}}^{\rm{o}}}{\rm{ = - 360}}\;{\rm{kJ/mol}}\)
(ii) \({\rm{C(s) + }}\frac{{\rm{1}}}{{\rm{2}}}{{\rm{O}}_{\rm{2}}}{\rm{(g)}} \to {\rm{CO(g);\Delta }}{{\rm{G}}^{\rm{o}}}{\rm{ = - 460}}\;{\rm{kJ/mol}}\)
then choose the correct statement from the following:

1 Zinc can be oxidised by \(\mathrm{\mathrm{CO}}\)
2 \(\mathrm{\mathrm{ZnO}}\) can be reduced by \(\mathrm{\mathrm{C}}\)
3 \(\mathrm{\mathrm{ZnO}}\) can be reduced by \(\mathrm{\mathrm{CO}}\)
4 None of the above
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CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321200 The relative stability of the metal oxides is \(\mathrm{\mathrm{CaO} < \mathrm{MgO} < \mathrm{Al}_{2} \mathrm{O}_{3} < \mathrm{Cr}_{2} \mathrm{O}_{3}}\).
The most stable metal among the following is

1 \(\mathrm{\mathrm{Ca}}\)
2 \(\mathrm{\mathrm{Mg}}\)
3 \(\mathrm{\mathrm{Al}}\)
4 \(\mathrm{\mathrm{Cr}}\)
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321201 Which metal has a greater tendency to form metal oxide?

1 \(\mathrm{\mathrm{Cr}}\)
2 \(\mathrm{\mathrm{Ca}}\)
3 \(\mathrm{\mathrm{Al}}\)
4 \(\mathrm{\mathrm{Fe}}\)
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321202 \(\mathrm{\Delta G^{o}}\) vs \(\mathrm{T}\) plot in the Ellingham's diagram slope is downward for the reaction

1 \(\mathrm{\mathrm{Mg}+\dfrac{1}{2} \mathrm{O}_{2} \rightarrow \mathrm{MgO}}\)
2 \(\mathrm{\dfrac{4}{3} \mathrm{Al}+\mathrm{O}_{2} \rightarrow \dfrac{2}{3} \mathrm{Al}_{2} \mathrm{O}_{3}}\)
3 \(\mathrm{\mathrm{C}+\dfrac{1}{2} \mathrm{O}_{2} \rightarrow \mathrm{CO}}\)
4 \(\mathrm{\mathrm{CO}+\dfrac{1}{2} \mathrm{O}_{2} \rightarrow \mathrm{CO}_{2}}\)
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321203 Consider the following reactions at \(\mathrm{1000^{\circ} \mathrm{C}}\),
(i) \({\rm{ Zn(s) + }}\frac{{\rm{1}}}{{\rm{2}}}{{\rm{O}}_{\rm{2}}}{\rm{(g)}} \to {\rm{ZnO(s);\Delta }}{{\rm{G}}^{\rm{o}}}{\rm{ = - 360}}\;{\rm{kJ/mol}}\)
(ii) \({\rm{C(s) + }}\frac{{\rm{1}}}{{\rm{2}}}{{\rm{O}}_{\rm{2}}}{\rm{(g)}} \to {\rm{CO(g);\Delta }}{{\rm{G}}^{\rm{o}}}{\rm{ = - 460}}\;{\rm{kJ/mol}}\)
then choose the correct statement from the following:

1 Zinc can be oxidised by \(\mathrm{\mathrm{CO}}\)
2 \(\mathrm{\mathrm{ZnO}}\) can be reduced by \(\mathrm{\mathrm{C}}\)
3 \(\mathrm{\mathrm{ZnO}}\) can be reduced by \(\mathrm{\mathrm{CO}}\)
4 None of the above
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CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321200 The relative stability of the metal oxides is \(\mathrm{\mathrm{CaO} < \mathrm{MgO} < \mathrm{Al}_{2} \mathrm{O}_{3} < \mathrm{Cr}_{2} \mathrm{O}_{3}}\).
The most stable metal among the following is

1 \(\mathrm{\mathrm{Ca}}\)
2 \(\mathrm{\mathrm{Mg}}\)
3 \(\mathrm{\mathrm{Al}}\)
4 \(\mathrm{\mathrm{Cr}}\)
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321201 Which metal has a greater tendency to form metal oxide?

1 \(\mathrm{\mathrm{Cr}}\)
2 \(\mathrm{\mathrm{Ca}}\)
3 \(\mathrm{\mathrm{Al}}\)
4 \(\mathrm{\mathrm{Fe}}\)
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321202 \(\mathrm{\Delta G^{o}}\) vs \(\mathrm{T}\) plot in the Ellingham's diagram slope is downward for the reaction

1 \(\mathrm{\mathrm{Mg}+\dfrac{1}{2} \mathrm{O}_{2} \rightarrow \mathrm{MgO}}\)
2 \(\mathrm{\dfrac{4}{3} \mathrm{Al}+\mathrm{O}_{2} \rightarrow \dfrac{2}{3} \mathrm{Al}_{2} \mathrm{O}_{3}}\)
3 \(\mathrm{\mathrm{C}+\dfrac{1}{2} \mathrm{O}_{2} \rightarrow \mathrm{CO}}\)
4 \(\mathrm{\mathrm{CO}+\dfrac{1}{2} \mathrm{O}_{2} \rightarrow \mathrm{CO}_{2}}\)
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321203 Consider the following reactions at \(\mathrm{1000^{\circ} \mathrm{C}}\),
(i) \({\rm{ Zn(s) + }}\frac{{\rm{1}}}{{\rm{2}}}{{\rm{O}}_{\rm{2}}}{\rm{(g)}} \to {\rm{ZnO(s);\Delta }}{{\rm{G}}^{\rm{o}}}{\rm{ = - 360}}\;{\rm{kJ/mol}}\)
(ii) \({\rm{C(s) + }}\frac{{\rm{1}}}{{\rm{2}}}{{\rm{O}}_{\rm{2}}}{\rm{(g)}} \to {\rm{CO(g);\Delta }}{{\rm{G}}^{\rm{o}}}{\rm{ = - 460}}\;{\rm{kJ/mol}}\)
then choose the correct statement from the following:

1 Zinc can be oxidised by \(\mathrm{\mathrm{CO}}\)
2 \(\mathrm{\mathrm{ZnO}}\) can be reduced by \(\mathrm{\mathrm{C}}\)
3 \(\mathrm{\mathrm{ZnO}}\) can be reduced by \(\mathrm{\mathrm{CO}}\)
4 None of the above
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