CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
321159
Statement A : Lead, tin and bismuth are purified by liquation method. Statement B : Lead, tin and bismuth have low m.p. as compared to impurities.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both Statements are incorrect.
Explanation:
Both the given statements are correct. So, the option (3) is correct.
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
321160
Zirconium is refined by
1 liquation process
2 Mond's process
3 electrolytic refining process
4 van Arkel method
Explanation:
van Arkel method is used for refining zirconium. In this method oxygen and nitrogen, present as impurity are removed by heating metal in an evacuated vessel with iodine. The metal iodide volatilise and it is decomposed on a tungsten filament, heated to about \(\mathrm{1800 \mathrm{~K}}\). The pure metal is deposited on the filament. \(\rm{\begin{aligned}\underset{\text { (impure) }}{\mathrm{Zr}}+2 \mathrm{I}_{2} \longrightarrow \mathrm{ZrI}_{4} \\\mathrm{ZrI}_{4} \longrightarrow \underset{\text { (pure) }}{\mathrm{Zr}}+2 \mathrm{I}_{2}\end{aligned}}\)
MHTCET - 2020
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
321161
Tin and zinc can be refined by:
1 Cupellation
2 Liquation
3 Poling
4 Bessemerisation
Explanation:
This process is used for the purification of the metal, which itself is readily fusible, but the impurities present in it are not, i.e., the impurities are infusible. This process is used for the purification of \(\mathrm{\mathrm{Sn}}\) and \(\mathrm{\mathrm{Zn}}\), and for removing \(\mathrm{\mathrm{Pb}}\) from \(\mathrm{\mathrm{Zn}-\mathrm{Ag}}\) alloy, which is obtained at the end of Parke's process and contains \(\mathrm{\mathrm{Pb}}\) as impurity.
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
321162
What is the principle & the method used for refining metals used as semiconductors?
1 Impurities are more soluble in melt than solid, Zone refining
2 Metal as melt gets purified, Zone refining
3 Impurities are sublimed, Vapourisation
4 Metal is sublimed, Vapourisation
Explanation:
Semiconducting metal is produced by zone refining method which is based on the principle that the impurities are more soluble in melt than in the solid state of metals.
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
321159
Statement A : Lead, tin and bismuth are purified by liquation method. Statement B : Lead, tin and bismuth have low m.p. as compared to impurities.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both Statements are incorrect.
Explanation:
Both the given statements are correct. So, the option (3) is correct.
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
321160
Zirconium is refined by
1 liquation process
2 Mond's process
3 electrolytic refining process
4 van Arkel method
Explanation:
van Arkel method is used for refining zirconium. In this method oxygen and nitrogen, present as impurity are removed by heating metal in an evacuated vessel with iodine. The metal iodide volatilise and it is decomposed on a tungsten filament, heated to about \(\mathrm{1800 \mathrm{~K}}\). The pure metal is deposited on the filament. \(\rm{\begin{aligned}\underset{\text { (impure) }}{\mathrm{Zr}}+2 \mathrm{I}_{2} \longrightarrow \mathrm{ZrI}_{4} \\\mathrm{ZrI}_{4} \longrightarrow \underset{\text { (pure) }}{\mathrm{Zr}}+2 \mathrm{I}_{2}\end{aligned}}\)
MHTCET - 2020
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
321161
Tin and zinc can be refined by:
1 Cupellation
2 Liquation
3 Poling
4 Bessemerisation
Explanation:
This process is used for the purification of the metal, which itself is readily fusible, but the impurities present in it are not, i.e., the impurities are infusible. This process is used for the purification of \(\mathrm{\mathrm{Sn}}\) and \(\mathrm{\mathrm{Zn}}\), and for removing \(\mathrm{\mathrm{Pb}}\) from \(\mathrm{\mathrm{Zn}-\mathrm{Ag}}\) alloy, which is obtained at the end of Parke's process and contains \(\mathrm{\mathrm{Pb}}\) as impurity.
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
321162
What is the principle & the method used for refining metals used as semiconductors?
1 Impurities are more soluble in melt than solid, Zone refining
2 Metal as melt gets purified, Zone refining
3 Impurities are sublimed, Vapourisation
4 Metal is sublimed, Vapourisation
Explanation:
Semiconducting metal is produced by zone refining method which is based on the principle that the impurities are more soluble in melt than in the solid state of metals.
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
321159
Statement A : Lead, tin and bismuth are purified by liquation method. Statement B : Lead, tin and bismuth have low m.p. as compared to impurities.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both Statements are incorrect.
Explanation:
Both the given statements are correct. So, the option (3) is correct.
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
321160
Zirconium is refined by
1 liquation process
2 Mond's process
3 electrolytic refining process
4 van Arkel method
Explanation:
van Arkel method is used for refining zirconium. In this method oxygen and nitrogen, present as impurity are removed by heating metal in an evacuated vessel with iodine. The metal iodide volatilise and it is decomposed on a tungsten filament, heated to about \(\mathrm{1800 \mathrm{~K}}\). The pure metal is deposited on the filament. \(\rm{\begin{aligned}\underset{\text { (impure) }}{\mathrm{Zr}}+2 \mathrm{I}_{2} \longrightarrow \mathrm{ZrI}_{4} \\\mathrm{ZrI}_{4} \longrightarrow \underset{\text { (pure) }}{\mathrm{Zr}}+2 \mathrm{I}_{2}\end{aligned}}\)
MHTCET - 2020
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
321161
Tin and zinc can be refined by:
1 Cupellation
2 Liquation
3 Poling
4 Bessemerisation
Explanation:
This process is used for the purification of the metal, which itself is readily fusible, but the impurities present in it are not, i.e., the impurities are infusible. This process is used for the purification of \(\mathrm{\mathrm{Sn}}\) and \(\mathrm{\mathrm{Zn}}\), and for removing \(\mathrm{\mathrm{Pb}}\) from \(\mathrm{\mathrm{Zn}-\mathrm{Ag}}\) alloy, which is obtained at the end of Parke's process and contains \(\mathrm{\mathrm{Pb}}\) as impurity.
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
321162
What is the principle & the method used for refining metals used as semiconductors?
1 Impurities are more soluble in melt than solid, Zone refining
2 Metal as melt gets purified, Zone refining
3 Impurities are sublimed, Vapourisation
4 Metal is sublimed, Vapourisation
Explanation:
Semiconducting metal is produced by zone refining method which is based on the principle that the impurities are more soluble in melt than in the solid state of metals.
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CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
321159
Statement A : Lead, tin and bismuth are purified by liquation method. Statement B : Lead, tin and bismuth have low m.p. as compared to impurities.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both Statements are incorrect.
Explanation:
Both the given statements are correct. So, the option (3) is correct.
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
321160
Zirconium is refined by
1 liquation process
2 Mond's process
3 electrolytic refining process
4 van Arkel method
Explanation:
van Arkel method is used for refining zirconium. In this method oxygen and nitrogen, present as impurity are removed by heating metal in an evacuated vessel with iodine. The metal iodide volatilise and it is decomposed on a tungsten filament, heated to about \(\mathrm{1800 \mathrm{~K}}\). The pure metal is deposited on the filament. \(\rm{\begin{aligned}\underset{\text { (impure) }}{\mathrm{Zr}}+2 \mathrm{I}_{2} \longrightarrow \mathrm{ZrI}_{4} \\\mathrm{ZrI}_{4} \longrightarrow \underset{\text { (pure) }}{\mathrm{Zr}}+2 \mathrm{I}_{2}\end{aligned}}\)
MHTCET - 2020
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
321161
Tin and zinc can be refined by:
1 Cupellation
2 Liquation
3 Poling
4 Bessemerisation
Explanation:
This process is used for the purification of the metal, which itself is readily fusible, but the impurities present in it are not, i.e., the impurities are infusible. This process is used for the purification of \(\mathrm{\mathrm{Sn}}\) and \(\mathrm{\mathrm{Zn}}\), and for removing \(\mathrm{\mathrm{Pb}}\) from \(\mathrm{\mathrm{Zn}-\mathrm{Ag}}\) alloy, which is obtained at the end of Parke's process and contains \(\mathrm{\mathrm{Pb}}\) as impurity.
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
321162
What is the principle & the method used for refining metals used as semiconductors?
1 Impurities are more soluble in melt than solid, Zone refining
2 Metal as melt gets purified, Zone refining
3 Impurities are sublimed, Vapourisation
4 Metal is sublimed, Vapourisation
Explanation:
Semiconducting metal is produced by zone refining method which is based on the principle that the impurities are more soluble in melt than in the solid state of metals.
