General Principles and Processes of Isolation of Elements Test

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General Principles and Processes of Isolation of Elements Test - 15

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Weekly Quiz Competition

Question 1
1 / -0

Impurities found in ores are called:

A
mud

B
gangue

C
electrolyte

D
none of the above

Solution

Ores mine from the earth are usually contaminated with large amount of impurities such as soil, sand etc known as gangue.
Question 2
1 / -0

Which of the following is not a method of extraction of metals?

A
Enrichment of ore

B
Refining

C
Magnetic separation

D
None of the above

Solution

Refining and magnetic separation are methods of extraction of metals .Enrichment of ore is also known as concentration of ore. It means purification of ore.
Question 3
1 / -0

The composition of thermite mixture is :

A
iron (III) oxide and aluminium powder in the ratio 1:3

B
aluminium powder and iron (III) oxide in the ratio 1:3

C
aluminium powder and barium peroxide in the ratio 1:3

D
barium peroxide and aluminium powder in the ratio 1:3

Solution

Thermite mixture is a pyrotechnic composition of metal powder fuel and metal oxide. It has diverse composition including Aluminium because of its high boiling point and low cost. Oxidizers include iron(III) oxide. This mixture is used for thermite welding, often used to join rail tracks, metal refining, weapons, fireworks etc.
Question 4
1 / -0

(a) Roasting and calcination are the two processes to reduce the metal oxides to the respective metals.
(b) Magnesium is extracted from its ore by electrolytic reduction process.
(c) Cryolite is used in metallurgy of aluminium in order to increase the fusibility and conductivity
(d) I Hall's process bauxite is leached with the help of $${Na}_{2}{CO}_{3}$$.
Which of the following options regarding the above statements is correct?

A
a, b and c

B
b, c and d

C
c and d

D
only a

Solution

(b) Magnesium is extracted from its ore by electrolytic reduction process.
(c) Cryolite is used in metallurgy of aluminium in order to increase the fusibility and conductivity
(d) I Hall's process bauxite is leached with the help of $${Na}_{2}{CO}_{3}$$. statements are correct. The concentrated ore is converted into metal oxide by calcination or roasting.
Question 5
1 / -0

Which of the following is used in making planes?

A
Copper

B
Tungsten

C
Aluminium

D
Steel

Solution

Aluminium is most widely used in making planes. They have a low density and they do not corrode.
Question 6
1 / -0

During electrolysis, electrons are being added directly to the metal ions at the ___________.

A
anode

B
cathode

C
both $$A$$ and $$B$$

D
none of the above

Solution

During electrolysis, electrons are being added directly to the metal ions at the cathode (the negative electrode). The downside (particularly in the aluminum case) is the cost of the electricity. An advantage is that it can produce very pure metals.
Question 7
1 / -0

What will happen during roasting?

A
The sulphide ores are converted into oxides

B
The oxide ores are converted into sulphides

C
The sulphide ores are converted into carbonates

D
The oxide ores are converted into carbonates.

Solution

During roasting, the sulphide ores are converted into oxides by heating strongly in excess of air.
$$ZnS + 3O_2 \rightarrow 2ZnO + 2SO_2$$
Question 8
1 / -0

Metals more reactive than carbon are usually extracted by_________.

A
Pyrolysis

B
Electrolysis

C
Fractional distillation

D
Filteration

Solution

Metals more reactive than carbon are usually extracted by electrolysis. Electrolysis is the process of breaking down a compound using electrical energy and is needed to extract the most reactive metals.
Question 9
1 / -0

What is the most common type of electrometallurgical processes to obtain pure metal?

A
Electro-refining

B
Electrowinning

C
Both a and b

D
Oxidation

Solution

The most common types of electrometallurgical processes are electrowinning and electro-refining. Electrowinning is an electrolysis process used to recover metals in aqueous solution, usually as the result of an ore having undergone one or more hydrometallurgical processes. Electro-refining is used to dissolve an impure metallic anode and produce a high purity cathode.
Question 10
1 / -0

How do we separate two sulphide ores by froth floatation method?

A
By using excess of pine oil.

B
By adjusting proportion of oil to water or using depressant.

C
By using collectors and froth stabilities like xanthates.

D
By using some solvent in which one of the sulphides is soluble.

Solution

By using depressants or adjusting proportion of oil to water, selective prevention of one sulphide ore from coming to the froth is possible.

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General Principles and Processes of Isolation of Elements Test - 15

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General Principles and Processes of Isolation of Elements Test - 15

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Question 1

mud

gangue

electrolyte

none of the above

Solution

Question 2

Enrichment of ore

Refining

Magnetic separation

None of the above

Solution

Question 3

iron (III) oxide and aluminium powder in the ratio 1:3

aluminium powder and iron (III) oxide in the ratio 1:3

aluminium powder and barium peroxide in the ratio 1:3

barium peroxide and aluminium powder in the ratio 1:3

Solution

Question 4

a, b and c

b, c and d

c and d

only a

Solution

Question 5

Copper

Tungsten

Aluminium

Steel

Solution

Question 6

anode

cathode

both $$A$$ and $$B$$

none of the above

Solution

Question 7

The sulphide ores are converted into oxides

The oxide ores are converted into sulphides

The sulphide ores are converted into carbonates

The oxide ores are converted into carbonates.

Solution

Question 8

Pyrolysis

Electrolysis

Fractional distillation

Filteration

Solution

Question 9

Electro-refining

Electrowinning

Both a and b

Oxidation

Solution

Question 10

By using excess of pine oil.

By adjusting proportion of oil to water or using depressant.

By using collectors and froth stabilities like xanthates.

By using some solvent in which one of the sulphides is soluble.

Solution

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