Extraction of Metals by Electrometallurgy
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CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321005 In the extraction of aluminium, Process \(\mathrm{X:}\) applied for red bauxite to remove iron oxide (chief impurity). Process Y : (Serpeck's process) : applied for white bauxite to remove \(\mathrm{Z}\) (chief impurity) then, process \(\mathrm{X}\) and impurity \(\mathrm{Z}\) are

1 \(\mathrm{\mathrm{X}=}\) Hall and Heroult's process and \({\rm{Z }}\) \({\rm{ is }}\) \({\rm{Si}}{{\rm{O}}_{\rm{2}}}\)
2 \(\mathrm{\mathrm{X}=}\) Baeyer's process and \({\rm{Z }}\) \({\rm{is}}\) \({\rm{Si}}{{\rm{O}}_{\rm{2}}}\)
3 \(\mathrm{\mathrm{X}=}\) Serpeck's process and \({\rm{Z}}\,\,{\rm{is}}\) iron oxide
4 \(\mathrm{X=}\) Baeyer's process and \({\rm{Z}}\,\,{\rm{is}}\) iron oxide
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321006 Read the Statement A and Statement B carefully and mark the correct option.
Statement A :
During electrolytic refining, the pure metal is made to act as anode and its impure metallic form is used as cathode.
Statement B :
During the Hall-Heroult electrolysis process, purified \(\mathrm{Al}_{2} \mathrm{O}_{3}\) is mixed with \(\mathrm{Na}_{3} \mathrm{AIF}_{6}\) to lower the melting point of the mixture.

1 Both Statement A and Statement B are correct.
2 Both Statement A and Statement B are incorrect.
3 Statement A is correct but Statement B is incorrect.
4 Statement A is incorrect but Statement B is correct.
JEE - 2023
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321007 The incorrect statement about Hall -Heroult process is :

1 Carbon anode is oxidised to CO and \({\mathrm{\mathrm{CO}_{2}}}\)
2 \({\mathrm{\mathrm{Na}_{3} \mathrm{AlF}_{6}}}\) helps to decrease the melting point of the electrolyte
3 \({\mathrm{\mathrm{CaF}_{2}}}\) helps to increase the conductivity of the electrolyte
4 Oxidation state of oxygen changes in the overall cell reaction
KCET - 2024
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321008 Cryolite is

1 \(\mathrm{\mathrm{Na}_{3} \mathrm{AlF}_{6}}\) and is used in the electrolysis of alumina for lowering the melting point of alumina only
2 \(\mathrm{\mathrm{Na}_{3} \mathrm{AlF}_{6}}\) and is used in the electrolytic refining of alumina
3 \(\mathrm{\mathrm{Na}_{3} \mathrm{AlF}_{6}}\) and is used in the electrolysis of alumina for decreasing electrical conductivity
4 \(\mathrm{\mathrm{Na}_{3} \mathrm{AlF}_{6}}\) and is used in the electrolysis of alumina for lowering the melting point and increasing the conductivity of alumina.
KCET - 2015
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CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321005 In the extraction of aluminium, Process \(\mathrm{X:}\) applied for red bauxite to remove iron oxide (chief impurity). Process Y : (Serpeck's process) : applied for white bauxite to remove \(\mathrm{Z}\) (chief impurity) then, process \(\mathrm{X}\) and impurity \(\mathrm{Z}\) are

1 \(\mathrm{\mathrm{X}=}\) Hall and Heroult's process and \({\rm{Z }}\) \({\rm{ is }}\) \({\rm{Si}}{{\rm{O}}_{\rm{2}}}\)
2 \(\mathrm{\mathrm{X}=}\) Baeyer's process and \({\rm{Z }}\) \({\rm{is}}\) \({\rm{Si}}{{\rm{O}}_{\rm{2}}}\)
3 \(\mathrm{\mathrm{X}=}\) Serpeck's process and \({\rm{Z}}\,\,{\rm{is}}\) iron oxide
4 \(\mathrm{X=}\) Baeyer's process and \({\rm{Z}}\,\,{\rm{is}}\) iron oxide
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321006 Read the Statement A and Statement B carefully and mark the correct option.
Statement A :
During electrolytic refining, the pure metal is made to act as anode and its impure metallic form is used as cathode.
Statement B :
During the Hall-Heroult electrolysis process, purified \(\mathrm{Al}_{2} \mathrm{O}_{3}\) is mixed with \(\mathrm{Na}_{3} \mathrm{AIF}_{6}\) to lower the melting point of the mixture.

1 Both Statement A and Statement B are correct.
2 Both Statement A and Statement B are incorrect.
3 Statement A is correct but Statement B is incorrect.
4 Statement A is incorrect but Statement B is correct.
JEE - 2023
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321007 The incorrect statement about Hall -Heroult process is :

1 Carbon anode is oxidised to CO and \({\mathrm{\mathrm{CO}_{2}}}\)
2 \({\mathrm{\mathrm{Na}_{3} \mathrm{AlF}_{6}}}\) helps to decrease the melting point of the electrolyte
3 \({\mathrm{\mathrm{CaF}_{2}}}\) helps to increase the conductivity of the electrolyte
4 Oxidation state of oxygen changes in the overall cell reaction
KCET - 2024
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321008 Cryolite is

1 \(\mathrm{\mathrm{Na}_{3} \mathrm{AlF}_{6}}\) and is used in the electrolysis of alumina for lowering the melting point of alumina only
2 \(\mathrm{\mathrm{Na}_{3} \mathrm{AlF}_{6}}\) and is used in the electrolytic refining of alumina
3 \(\mathrm{\mathrm{Na}_{3} \mathrm{AlF}_{6}}\) and is used in the electrolysis of alumina for decreasing electrical conductivity
4 \(\mathrm{\mathrm{Na}_{3} \mathrm{AlF}_{6}}\) and is used in the electrolysis of alumina for lowering the melting point and increasing the conductivity of alumina.
KCET - 2015
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CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321005 In the extraction of aluminium, Process \(\mathrm{X:}\) applied for red bauxite to remove iron oxide (chief impurity). Process Y : (Serpeck's process) : applied for white bauxite to remove \(\mathrm{Z}\) (chief impurity) then, process \(\mathrm{X}\) and impurity \(\mathrm{Z}\) are

1 \(\mathrm{\mathrm{X}=}\) Hall and Heroult's process and \({\rm{Z }}\) \({\rm{ is }}\) \({\rm{Si}}{{\rm{O}}_{\rm{2}}}\)
2 \(\mathrm{\mathrm{X}=}\) Baeyer's process and \({\rm{Z }}\) \({\rm{is}}\) \({\rm{Si}}{{\rm{O}}_{\rm{2}}}\)
3 \(\mathrm{\mathrm{X}=}\) Serpeck's process and \({\rm{Z}}\,\,{\rm{is}}\) iron oxide
4 \(\mathrm{X=}\) Baeyer's process and \({\rm{Z}}\,\,{\rm{is}}\) iron oxide
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321006 Read the Statement A and Statement B carefully and mark the correct option.
Statement A :
During electrolytic refining, the pure metal is made to act as anode and its impure metallic form is used as cathode.
Statement B :
During the Hall-Heroult electrolysis process, purified \(\mathrm{Al}_{2} \mathrm{O}_{3}\) is mixed with \(\mathrm{Na}_{3} \mathrm{AIF}_{6}\) to lower the melting point of the mixture.

1 Both Statement A and Statement B are correct.
2 Both Statement A and Statement B are incorrect.
3 Statement A is correct but Statement B is incorrect.
4 Statement A is incorrect but Statement B is correct.
JEE - 2023
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321007 The incorrect statement about Hall -Heroult process is :

1 Carbon anode is oxidised to CO and \({\mathrm{\mathrm{CO}_{2}}}\)
2 \({\mathrm{\mathrm{Na}_{3} \mathrm{AlF}_{6}}}\) helps to decrease the melting point of the electrolyte
3 \({\mathrm{\mathrm{CaF}_{2}}}\) helps to increase the conductivity of the electrolyte
4 Oxidation state of oxygen changes in the overall cell reaction
KCET - 2024
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321008 Cryolite is

1 \(\mathrm{\mathrm{Na}_{3} \mathrm{AlF}_{6}}\) and is used in the electrolysis of alumina for lowering the melting point of alumina only
2 \(\mathrm{\mathrm{Na}_{3} \mathrm{AlF}_{6}}\) and is used in the electrolytic refining of alumina
3 \(\mathrm{\mathrm{Na}_{3} \mathrm{AlF}_{6}}\) and is used in the electrolysis of alumina for decreasing electrical conductivity
4 \(\mathrm{\mathrm{Na}_{3} \mathrm{AlF}_{6}}\) and is used in the electrolysis of alumina for lowering the melting point and increasing the conductivity of alumina.
KCET - 2015
Join With Us for More Updates
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321005 In the extraction of aluminium, Process \(\mathrm{X:}\) applied for red bauxite to remove iron oxide (chief impurity). Process Y : (Serpeck's process) : applied for white bauxite to remove \(\mathrm{Z}\) (chief impurity) then, process \(\mathrm{X}\) and impurity \(\mathrm{Z}\) are

1 \(\mathrm{\mathrm{X}=}\) Hall and Heroult's process and \({\rm{Z }}\) \({\rm{ is }}\) \({\rm{Si}}{{\rm{O}}_{\rm{2}}}\)
2 \(\mathrm{\mathrm{X}=}\) Baeyer's process and \({\rm{Z }}\) \({\rm{is}}\) \({\rm{Si}}{{\rm{O}}_{\rm{2}}}\)
3 \(\mathrm{\mathrm{X}=}\) Serpeck's process and \({\rm{Z}}\,\,{\rm{is}}\) iron oxide
4 \(\mathrm{X=}\) Baeyer's process and \({\rm{Z}}\,\,{\rm{is}}\) iron oxide
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321006 Read the Statement A and Statement B carefully and mark the correct option.
Statement A :
During electrolytic refining, the pure metal is made to act as anode and its impure metallic form is used as cathode.
Statement B :
During the Hall-Heroult electrolysis process, purified \(\mathrm{Al}_{2} \mathrm{O}_{3}\) is mixed with \(\mathrm{Na}_{3} \mathrm{AIF}_{6}\) to lower the melting point of the mixture.

1 Both Statement A and Statement B are correct.
2 Both Statement A and Statement B are incorrect.
3 Statement A is correct but Statement B is incorrect.
4 Statement A is incorrect but Statement B is correct.
JEE - 2023
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321007 The incorrect statement about Hall -Heroult process is :

1 Carbon anode is oxidised to CO and \({\mathrm{\mathrm{CO}_{2}}}\)
2 \({\mathrm{\mathrm{Na}_{3} \mathrm{AlF}_{6}}}\) helps to decrease the melting point of the electrolyte
3 \({\mathrm{\mathrm{CaF}_{2}}}\) helps to increase the conductivity of the electrolyte
4 Oxidation state of oxygen changes in the overall cell reaction
KCET - 2024
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321008 Cryolite is

1 \(\mathrm{\mathrm{Na}_{3} \mathrm{AlF}_{6}}\) and is used in the electrolysis of alumina for lowering the melting point of alumina only
2 \(\mathrm{\mathrm{Na}_{3} \mathrm{AlF}_{6}}\) and is used in the electrolytic refining of alumina
3 \(\mathrm{\mathrm{Na}_{3} \mathrm{AlF}_{6}}\) and is used in the electrolysis of alumina for decreasing electrical conductivity
4 \(\mathrm{\mathrm{Na}_{3} \mathrm{AlF}_{6}}\) and is used in the electrolysis of alumina for lowering the melting point and increasing the conductivity of alumina.
KCET - 2015
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