CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
321140
Carbon reduction method is employed for commercial extraction of
1 Haematite
2 Silver glance
3 Iron pyrite
4 Corundum
Explanation:
Iron extracted from haematite by using carbon reduction method.
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
321141
A sulphide ore like \(\mathrm{\mathrm{ZnS}}\) is first roasted into its oxide prior to reduction by carbon because:
1 A sulphide ore cannot be reduced to metal at all.
2 No reducing agent is found suitable for reducing a sulphide ore.
3 The Gibbs free energy of formation of most sulphides are greater than that for \(\mathrm{C S_{2}}\).
4 A metal oxide is generally less stable than the metal sulphide.
Explanation:
The Gibbs free energy of sulphides are greater than that for \(\mathrm{C S_{2}}\). In fact, \(\mathrm{C S_{2}}\) is an endothermic compound. Therefore, the \({{\rm{\Delta }}_{\rm{f}}}{{\rm{G}}^{\rm{{\rm O}}}}\) of \(\mathrm{M_{x} S}\) is not compensated. So reduction of \(\mathrm{M_{x} S}\) is difficult. Hence it is a common practice to roast sulphide ores to corresponding oxides prior to reduction.
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
321142
Flux is used to
1 remove all type of impurities
2 reduce metal oxide
3 remove carbonate and sulphate
4 remove silica and undesirable metal oxides
Explanation:
Flux removes silica and undesirable metal oxides such as silicates, etc.
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
321143
Assertion : Hydrometallurgy involves dissolving the ore in a suitable reagent followed by precipitation by a more electropositive metal. Reason : Copper is extracted by hydrometallurgy.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
Hydrometallurgy involves dissolving the ore in a suitable reagent followed by precipitation by a more electropositive metal in which pure metal is get replaced by more electropositive metal. Both assertion and reason are correct and reason is not the correct explanation of assertion. So, the option (2) is correct.
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CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
321140
Carbon reduction method is employed for commercial extraction of
1 Haematite
2 Silver glance
3 Iron pyrite
4 Corundum
Explanation:
Iron extracted from haematite by using carbon reduction method.
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
321141
A sulphide ore like \(\mathrm{\mathrm{ZnS}}\) is first roasted into its oxide prior to reduction by carbon because:
1 A sulphide ore cannot be reduced to metal at all.
2 No reducing agent is found suitable for reducing a sulphide ore.
3 The Gibbs free energy of formation of most sulphides are greater than that for \(\mathrm{C S_{2}}\).
4 A metal oxide is generally less stable than the metal sulphide.
Explanation:
The Gibbs free energy of sulphides are greater than that for \(\mathrm{C S_{2}}\). In fact, \(\mathrm{C S_{2}}\) is an endothermic compound. Therefore, the \({{\rm{\Delta }}_{\rm{f}}}{{\rm{G}}^{\rm{{\rm O}}}}\) of \(\mathrm{M_{x} S}\) is not compensated. So reduction of \(\mathrm{M_{x} S}\) is difficult. Hence it is a common practice to roast sulphide ores to corresponding oxides prior to reduction.
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
321142
Flux is used to
1 remove all type of impurities
2 reduce metal oxide
3 remove carbonate and sulphate
4 remove silica and undesirable metal oxides
Explanation:
Flux removes silica and undesirable metal oxides such as silicates, etc.
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
321143
Assertion : Hydrometallurgy involves dissolving the ore in a suitable reagent followed by precipitation by a more electropositive metal. Reason : Copper is extracted by hydrometallurgy.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
Hydrometallurgy involves dissolving the ore in a suitable reagent followed by precipitation by a more electropositive metal in which pure metal is get replaced by more electropositive metal. Both assertion and reason are correct and reason is not the correct explanation of assertion. So, the option (2) is correct.
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
321140
Carbon reduction method is employed for commercial extraction of
1 Haematite
2 Silver glance
3 Iron pyrite
4 Corundum
Explanation:
Iron extracted from haematite by using carbon reduction method.
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
321141
A sulphide ore like \(\mathrm{\mathrm{ZnS}}\) is first roasted into its oxide prior to reduction by carbon because:
1 A sulphide ore cannot be reduced to metal at all.
2 No reducing agent is found suitable for reducing a sulphide ore.
3 The Gibbs free energy of formation of most sulphides are greater than that for \(\mathrm{C S_{2}}\).
4 A metal oxide is generally less stable than the metal sulphide.
Explanation:
The Gibbs free energy of sulphides are greater than that for \(\mathrm{C S_{2}}\). In fact, \(\mathrm{C S_{2}}\) is an endothermic compound. Therefore, the \({{\rm{\Delta }}_{\rm{f}}}{{\rm{G}}^{\rm{{\rm O}}}}\) of \(\mathrm{M_{x} S}\) is not compensated. So reduction of \(\mathrm{M_{x} S}\) is difficult. Hence it is a common practice to roast sulphide ores to corresponding oxides prior to reduction.
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
321142
Flux is used to
1 remove all type of impurities
2 reduce metal oxide
3 remove carbonate and sulphate
4 remove silica and undesirable metal oxides
Explanation:
Flux removes silica and undesirable metal oxides such as silicates, etc.
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
321143
Assertion : Hydrometallurgy involves dissolving the ore in a suitable reagent followed by precipitation by a more electropositive metal. Reason : Copper is extracted by hydrometallurgy.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
Hydrometallurgy involves dissolving the ore in a suitable reagent followed by precipitation by a more electropositive metal in which pure metal is get replaced by more electropositive metal. Both assertion and reason are correct and reason is not the correct explanation of assertion. So, the option (2) is correct.
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
321140
Carbon reduction method is employed for commercial extraction of
1 Haematite
2 Silver glance
3 Iron pyrite
4 Corundum
Explanation:
Iron extracted from haematite by using carbon reduction method.
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
321141
A sulphide ore like \(\mathrm{\mathrm{ZnS}}\) is first roasted into its oxide prior to reduction by carbon because:
1 A sulphide ore cannot be reduced to metal at all.
2 No reducing agent is found suitable for reducing a sulphide ore.
3 The Gibbs free energy of formation of most sulphides are greater than that for \(\mathrm{C S_{2}}\).
4 A metal oxide is generally less stable than the metal sulphide.
Explanation:
The Gibbs free energy of sulphides are greater than that for \(\mathrm{C S_{2}}\). In fact, \(\mathrm{C S_{2}}\) is an endothermic compound. Therefore, the \({{\rm{\Delta }}_{\rm{f}}}{{\rm{G}}^{\rm{{\rm O}}}}\) of \(\mathrm{M_{x} S}\) is not compensated. So reduction of \(\mathrm{M_{x} S}\) is difficult. Hence it is a common practice to roast sulphide ores to corresponding oxides prior to reduction.
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
321142
Flux is used to
1 remove all type of impurities
2 reduce metal oxide
3 remove carbonate and sulphate
4 remove silica and undesirable metal oxides
Explanation:
Flux removes silica and undesirable metal oxides such as silicates, etc.
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
321143
Assertion : Hydrometallurgy involves dissolving the ore in a suitable reagent followed by precipitation by a more electropositive metal. Reason : Copper is extracted by hydrometallurgy.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
Hydrometallurgy involves dissolving the ore in a suitable reagent followed by precipitation by a more electropositive metal in which pure metal is get replaced by more electropositive metal. Both assertion and reason are correct and reason is not the correct explanation of assertion. So, the option (2) is correct.