General Principles & Processes of Isolation of Elements Practice Questions - DPP for JEE

 Page 1


1. Identity x, y, z for the following metallurgical process.
Metal sulphide  Metal oxide  Impure metal  Pure metal.
x, y and z are respectively
(a) roasting, smelting, electrolysis
(b) roasting, calcination, smelting
(c) calcination, auto-reduction, bassemerisation
(d) none of the above is correct
2. Bronze is a mixture of
(a) Pb + Sn
(b) Cu + Sn
(c) Cu + Zn
(d) Pb + Zn
3. Which reagent is used in Bayer’s process?
(a) Na
2
CO
3
(b) Carbon
(c) NaOH
(d) Silica
4. Which of the following fluxes is used to remove acidic impurities in
Page 2


1. Identity x, y, z for the following metallurgical process.
Metal sulphide  Metal oxide  Impure metal  Pure metal.
x, y and z are respectively
(a) roasting, smelting, electrolysis
(b) roasting, calcination, smelting
(c) calcination, auto-reduction, bassemerisation
(d) none of the above is correct
2. Bronze is a mixture of
(a) Pb + Sn
(b) Cu + Sn
(c) Cu + Zn
(d) Pb + Zn
3. Which reagent is used in Bayer’s process?
(a) Na
2
CO
3
(b) Carbon
(c) NaOH
(d) Silica
4. Which of the following fluxes is used to remove acidic impurities in
metallurgical process?
(a) Silica
(b) Lime stone
(c) Sodium chloride
(d) Sodium carbonate
5. A basic lining is given to a furnace by using
(a) Calcined dolomite
(b) Lime stone
(c) Haematite
(d) Silica
6. Extraction of gold and silver involves leaching with CN
–
 ion. Silver is
later recovered by
(a) distillation
(b) zone refining
(c) displacement with Zn
(d) liquation
7. Which of the following reactions is an example for calcination process
?
(a)
(b)
(c)
(d)
8. G° vs T plot in the Ellingham’s diagram slopes downward for the
reaction
(a)
(b)
(c)
Page 3


1. Identity x, y, z for the following metallurgical process.
Metal sulphide  Metal oxide  Impure metal  Pure metal.
x, y and z are respectively
(a) roasting, smelting, electrolysis
(b) roasting, calcination, smelting
(c) calcination, auto-reduction, bassemerisation
(d) none of the above is correct
2. Bronze is a mixture of
(a) Pb + Sn
(b) Cu + Sn
(c) Cu + Zn
(d) Pb + Zn
3. Which reagent is used in Bayer’s process?
(a) Na
2
CO
3
(b) Carbon
(c) NaOH
(d) Silica
4. Which of the following fluxes is used to remove acidic impurities in
metallurgical process?
(a) Silica
(b) Lime stone
(c) Sodium chloride
(d) Sodium carbonate
5. A basic lining is given to a furnace by using
(a) Calcined dolomite
(b) Lime stone
(c) Haematite
(d) Silica
6. Extraction of gold and silver involves leaching with CN
–
 ion. Silver is
later recovered by
(a) distillation
(b) zone refining
(c) displacement with Zn
(d) liquation
7. Which of the following reactions is an example for calcination process
?
(a)
(b)
(c)
(d)
8. G° vs T plot in the Ellingham’s diagram slopes downward for the
reaction
(a)
(b)
(c)
(d)
9. Which of the following elements is present as the impurity to the
maximum extent in the pig iron ?
(a) Manganese
(b) Carbon
(c) Silicon
(d) Phosphorus
10. Among the following statements the incorrect one is
(a) Calamine and siderite are carbonates
(b) Argentite and cuprite are oxides
(c) Zinc blende and iron pyrites are sulphides
(d) Malachite and azurite are ores of copper.
11. Match list I with list II and select the correct answer given below the
lists:
List I List II
I. Cyanide process A.  Ultrapure Ge
II. Floatation process B.   Pine oil
III. Electrolytic reduction C.   Extraction of Al
IV. Zone refining D.   Extraction of Au
(a) I-C, II-A, III-D, IV-B
(b) I-D,II-B,III-C,IV-A 
(c) I-C,II-B,III-D, IV-A
(d) I-D,II-A,III-C,IV-B
12. A coupled  reaction is takes place as follow–
A + B ––––? C + D, ? Gº = + x kj
D + E ––––? F ? Gº = – y kj
for the spontaneity of reaction A + B + E  –––? C+F, which of the following
is correct?
Page 4


1. Identity x, y, z for the following metallurgical process.
Metal sulphide  Metal oxide  Impure metal  Pure metal.
x, y and z are respectively
(a) roasting, smelting, electrolysis
(b) roasting, calcination, smelting
(c) calcination, auto-reduction, bassemerisation
(d) none of the above is correct
2. Bronze is a mixture of
(a) Pb + Sn
(b) Cu + Sn
(c) Cu + Zn
(d) Pb + Zn
3. Which reagent is used in Bayer’s process?
(a) Na
2
CO
3
(b) Carbon
(c) NaOH
(d) Silica
4. Which of the following fluxes is used to remove acidic impurities in
metallurgical process?
(a) Silica
(b) Lime stone
(c) Sodium chloride
(d) Sodium carbonate
5. A basic lining is given to a furnace by using
(a) Calcined dolomite
(b) Lime stone
(c) Haematite
(d) Silica
6. Extraction of gold and silver involves leaching with CN
–
 ion. Silver is
later recovered by
(a) distillation
(b) zone refining
(c) displacement with Zn
(d) liquation
7. Which of the following reactions is an example for calcination process
?
(a)
(b)
(c)
(d)
8. G° vs T plot in the Ellingham’s diagram slopes downward for the
reaction
(a)
(b)
(c)
(d)
9. Which of the following elements is present as the impurity to the
maximum extent in the pig iron ?
(a) Manganese
(b) Carbon
(c) Silicon
(d) Phosphorus
10. Among the following statements the incorrect one is
(a) Calamine and siderite are carbonates
(b) Argentite and cuprite are oxides
(c) Zinc blende and iron pyrites are sulphides
(d) Malachite and azurite are ores of copper.
11. Match list I with list II and select the correct answer given below the
lists:
List I List II
I. Cyanide process A.  Ultrapure Ge
II. Floatation process B.   Pine oil
III. Electrolytic reduction C.   Extraction of Al
IV. Zone refining D.   Extraction of Au
(a) I-C, II-A, III-D, IV-B
(b) I-D,II-B,III-C,IV-A 
(c) I-C,II-B,III-D, IV-A
(d) I-D,II-A,III-C,IV-B
12. A coupled  reaction is takes place as follow–
A + B ––––? C + D, ? Gº = + x kj
D + E ––––? F ? Gº = – y kj
for the spontaneity of reaction A + B + E  –––? C+F, which of the following
is correct?
(a) 2x = y
(b) x < y 
(c) x > y
(d) x = (y)× T?S
13. Aluminium is extracted from alumina (Al
2
O
3
 ) by electrolysis of a
molten mixture of
(a) Al
2
O
3
 + HF + NaAlF
4
(b) Al
2
O
3
 + CaF
2
 + NaAlF
4
(c) Al
2
O
3
 + Na
3
AlF
6
 + CaF
2
(d) Al
2
O
3
 + KF + Na
3
AlF
6
14. Which of the following statements, about the advantage of roasting of
sulphide ore before reduction is not true?
(a) The  of the sulphide is greater than those for CS
2
 and H
2
S.
(b) The  is negative for roasting of sulphide ore to oxide.
(c) Roasting of the sulphide to the oxide is thermodynamically feasible.
(d) Carbon and hydrogen are suitable reducing agents for reduction of metal
sulphides.
15. In the extraction of copper from its sulphide ore, the metal is finally
obtained by the reduction of cuprous oxide with :
(a) Copper (I) sulphide (Cu
2
S)
(b) Sulphur dioxide (SO
2
)
(c) Iron sulphide (FeS)
(d) Carbon monoxide (CO)
16. The method of zone refining of metals is based on the principle
of
(a) Greater solubility of the impurity in the molten state than in the solid.
(b) Greater mobility of the pure metal than that of the impurity.
Page 5


1. Identity x, y, z for the following metallurgical process.
Metal sulphide  Metal oxide  Impure metal  Pure metal.
x, y and z are respectively
(a) roasting, smelting, electrolysis
(b) roasting, calcination, smelting
(c) calcination, auto-reduction, bassemerisation
(d) none of the above is correct
2. Bronze is a mixture of
(a) Pb + Sn
(b) Cu + Sn
(c) Cu + Zn
(d) Pb + Zn
3. Which reagent is used in Bayer’s process?
(a) Na
2
CO
3
(b) Carbon
(c) NaOH
(d) Silica
4. Which of the following fluxes is used to remove acidic impurities in
metallurgical process?
(a) Silica
(b) Lime stone
(c) Sodium chloride
(d) Sodium carbonate
5. A basic lining is given to a furnace by using
(a) Calcined dolomite
(b) Lime stone
(c) Haematite
(d) Silica
6. Extraction of gold and silver involves leaching with CN
–
 ion. Silver is
later recovered by
(a) distillation
(b) zone refining
(c) displacement with Zn
(d) liquation
7. Which of the following reactions is an example for calcination process
?
(a)
(b)
(c)
(d)
8. G° vs T plot in the Ellingham’s diagram slopes downward for the
reaction
(a)
(b)
(c)
(d)
9. Which of the following elements is present as the impurity to the
maximum extent in the pig iron ?
(a) Manganese
(b) Carbon
(c) Silicon
(d) Phosphorus
10. Among the following statements the incorrect one is
(a) Calamine and siderite are carbonates
(b) Argentite and cuprite are oxides
(c) Zinc blende and iron pyrites are sulphides
(d) Malachite and azurite are ores of copper.
11. Match list I with list II and select the correct answer given below the
lists:
List I List II
I. Cyanide process A.  Ultrapure Ge
II. Floatation process B.   Pine oil
III. Electrolytic reduction C.   Extraction of Al
IV. Zone refining D.   Extraction of Au
(a) I-C, II-A, III-D, IV-B
(b) I-D,II-B,III-C,IV-A 
(c) I-C,II-B,III-D, IV-A
(d) I-D,II-A,III-C,IV-B
12. A coupled  reaction is takes place as follow–
A + B ––––? C + D, ? Gº = + x kj
D + E ––––? F ? Gº = – y kj
for the spontaneity of reaction A + B + E  –––? C+F, which of the following
is correct?
(a) 2x = y
(b) x < y 
(c) x > y
(d) x = (y)× T?S
13. Aluminium is extracted from alumina (Al
2
O
3
 ) by electrolysis of a
molten mixture of
(a) Al
2
O
3
 + HF + NaAlF
4
(b) Al
2
O
3
 + CaF
2
 + NaAlF
4
(c) Al
2
O
3
 + Na
3
AlF
6
 + CaF
2
(d) Al
2
O
3
 + KF + Na
3
AlF
6
14. Which of the following statements, about the advantage of roasting of
sulphide ore before reduction is not true?
(a) The  of the sulphide is greater than those for CS
2
 and H
2
S.
(b) The  is negative for roasting of sulphide ore to oxide.
(c) Roasting of the sulphide to the oxide is thermodynamically feasible.
(d) Carbon and hydrogen are suitable reducing agents for reduction of metal
sulphides.
15. In the extraction of copper from its sulphide ore, the metal is finally
obtained by the reduction of cuprous oxide with :
(a) Copper (I) sulphide (Cu
2
S)
(b) Sulphur dioxide (SO
2
)
(c) Iron sulphide (FeS)
(d) Carbon monoxide (CO)
16. The method of zone refining of metals is based on the principle
of
(a) Greater solubility of the impurity in the molten state than in the solid.
(b) Greater mobility of the pure metal than that of the impurity.
(c) Higher melting point of the impurity than that of the pure metal.
(d) Greater noble character of the solid metal than that of the impurity.
17. In the cyanide extraction process of silver from argentite ore, the
oxidising and reducing agents used are     
(a) O
2
 and  CO respectively
(b) O
2
 and Zn dust respectively
(c) HNO
3
 and Zn dust respectively
(d) HNO
3
 and CO respectively
18. The metal oxide which cannot be reduced to metal by carbon is
(a) Fe
2
O
3
(b) Al
2
O
3
(c) PbO
(d) ZnO
19. Which process represents the change,
(a) Cupellation
(b) Van Arkel
(c) Polling
(d) Zone Refining
20. Among the following groups of oxides, the group containing oxides that
cannot be reduced by carbon to give the respective  metals is
(a) (b)
(c) (d)
21. Which of the following pairs of metals is purified by van Arkel method
?
(a) Ga and In
(b) Zr and Ti
(c) Ag and Au
(d) Ni and Fe
22. Which of the following pair is incorrectly matched ?