51
Identify the incorrect statement with reference to unit processes in extractive metallurgy.
A)
Selective distillation is a purification technique used in extractive metallurgy
B)
Coking of coal is carried out in a shaft furnace
C)
Precipitation is a hydrometallurgy route of purification
D)
Predominance area diagram is used to select the opening conditions of roastings
Answer & Solution
Answer: Option
B
A)
Rutile: TiO2
B)
Ilmenite: FeO.TiO2
C)
Both A and B
D)
None of these
Answer & Solution
Answer: Option
C
53
Which types process involve for Mg Extraction
A)
Pidgeon process
B)
WORCA process
C)
Both A and B
D)
None of the these
Answer & Solution
Answer: Option
A
54
Match the following:
Group 1 Group 2
P. Fire refinning
1. Zirconium
Q. Zone refinning
2. Nickel
R. Refinning via carbonyl
3. Germanium
S. Iodide refining
4. Copper
A)
P-4, Q-3, R-2, S-1
B)
P-4, Q-3, R-1, S-2
C)
P-3, Q-4, R-2, S-1
D)
P-3, Q-4, R-1, S-2
Answer & Solution
Answer: Option
A
55
Debismuthizing of lead extraction
A)
The base bullion consists high Bi% which get separated
B)
addition of Ca and Mg to forms an insoluble intermetallic compound of Bi
C)
Both A and B
D)
None of these
Answer & Solution
Answer: Option
C
56
Match the metals in
Group 1 with the processes in
Group 2 .
Group 1 Group 2
P. Aluminium
1. Poling
Q. Copper
2. Fused salt electrolysis
R. Zinc
3. Rotary kiln process
S. Iron sponge
4. Distillation
A)
P-1, Q-2, R-3, S-4
B)
P-2, Q-1, R-4, S-3
C)
P-1, Q-2, R-4, S-3
D)
P-3, Q-4, R-2, S-1
Answer & Solution
Answer: Option
D
57
Match the process in
group 1 to its description in
group 2 .
Group 1 Group 2
P. COREX process
1. Decarburisation of liquid steel
Q. OBM process
2. Steel making using oxygen
R. Carbonyl process
3. Nickel refmning
S. AOD process
4. Alternative route of liquid iron production
A)
P-4, Q-2, R-3, S-1
B)
P-3, Q-1, R-2, S-4
C)
P-1, Q-4, R-3, S-1
D)
P-2, Q-1, R-3, S-4
Answer & Solution
Answer: Option
A
58
Identify the correct statement with reference to the extractive metallurgy of aluminium.
A)
The electrolyte consists of molten Na3 AlF6 with approximately 1 to 8% Al2 O3
B)
Approximately 80% of the aluminium deposited on the cathode comes from cryolite
C)
Sodium is deposited along with aluminium, but is immediately vapourised
D)
Anode effect sets in when the cryolite concentration goes below 40%
Answer & Solution
Answer: Option
A
59
Which types of process generally take place by friction moments along wet vibrating solid surface
A)
Jigging
B)
Tabling
C)
Floatation
D)
None of the these
Answer & Solution
Answer: Option
B
60
Monazite deposits constitute an important source forthe following metal
A)
Thorium
B)
Titanium
C)
Molybdenum
D)
None of the above
Answer & Solution
Answer: Option
A
