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General Principles and Processes of Isolation of Elements
- Online Test
General Principles and Processes of Isolation of Elements
TEST : 4
# General Principles and Processes of Isolation of Elements
# CBSE 12TH CHEMISTRY
Prepare / Learn
Q1.
In the froth floatation process for the concentration of ore, the particles float because
A.
They reacts with oil
B.
Their surface is wetted with oil
C.
They are insoluble
D.
They are light
View Solution
Add Work Space
Answer :
Option B
Explaination / Solution:
In froth floatation ore particles get wetted with oil and comes to the surface with froath.
# General Principles and Processes of Isolation of Elements
# CBSE 12TH CHEMISTRY
Prepare / Learn
Q2.
Which among the following act as forth stabilizer?
A.
Coal tar
B.
Sodium ethyl xanthate
C.
Pine oil
D.
Aniline
View Solution
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Answer :
Option D
Explaination / Solution:
Aniline stabalises the froath.
# General Principles and Processes of Isolation of Elements
# CBSE 12TH CHEMISTRY
Prepare / Learn
Q3.
Which among the following is a chemical process?
A.
Froth floatation
B.
Leaching
C.
Magnetic separation
D.
Gravity separation
View Solution
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Answer :
Option B
Explaination / Solution:
Leaching is a process in which ore is digested with a solvent to form a soluble complex.
# General Principles and Processes of Isolation of Elements
# CBSE 12TH CHEMISTRY
Prepare / Learn
Q4.
Impurities associated with Bauxite ore is/are
A.
All of the above
B.
F
e
2
O
3
C.
T
i
O
2
D.
S
i
O
2
View Solution
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Answer :
Option A
Explaination / Solution:
Bauxite ore have silica,
T
i
O
2
and
F
e
2
O
3
as impurity.
# General Principles and Processes of Isolation of Elements
# CBSE 12TH CHEMISTRY
Prepare / Learn
Q5.
Which among the following act as flux , if iron oxide is present as an impurity?
B.
H
2
S
O
4
D.
S
i
O
2
S
i
O
S
i
O
2
View Solution
Add Work Space
Answer :
Option D
Explaination / Solution:
Iron oxide is basic oxide so flux should be acidic.
# General Principles and Processes of Isolation of Elements
# CBSE 12TH CHEMISTRY
Prepare / Learn
Q6.
Which of the following metals cannot be extracted by smelting process?
A.
Al
B.
Pb
C.
Fe
D.
Zn
View Solution
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Answer :
Option A
Explaination / Solution:
Al cannot be extracted by smelting.
# General Principles and Processes of Isolation of Elements
# CBSE 12TH CHEMISTRY
Prepare / Learn
Q7.
The furnace which gives the highest temperature is
A.
Muffle furnace
B.
Electrical furnace
C.
Reverberatory furnace
D.
Blast furnace
View Solution
Add Work Space
Answer :
Option D
Explaination / Solution:
Blast furnance maintains the highest temperature.
# General Principles and Processes of Isolation of Elements
# CBSE 12TH CHEMISTRY
Prepare / Learn
Q8.
At 1123 K temperature in the blast furnace , CO reduces
A.
F
e
2
O
3
to FeO
B.
FeO to Fe
C.
F
e
2
O
3
to Fe
D.
Fe to FeO
View Solution
Add Work Space
Answer :
Option B
Explaination / Solution:
At this Temp range free energy for the process is negative.
# General Principles and Processes of Isolation of Elements
# CBSE 12TH CHEMISTRY
Prepare / Learn
Q9.
Which among the following is not a basic flux?
A.
S
i
O
2
C.
C
a
C
O
3
View Solution
Add Work Space
Answer :
Option A
Explaination / Solution:
S
i
O
2
is acidic flux because Si is non metal.
# General Principles and Processes of Isolation of Elements
# CBSE 12TH CHEMISTRY
Prepare / Learn
Q10.
The distillation process is used for the purification of
A.
Sn
B.
Hg
C.
Pb
D.
Cs
View Solution
Add Work Space
Answer :
Option B
Explaination / Solution:
Hg is purified by distillation.
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