General Principles and Processes of Isolation of Elements Test

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General Principles and Processes of Isolation of Elements Test - 14

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Weekly Quiz Competition

Question 1
1 / -0

Which of these is not the step involved in extraction of an ore?

A
Concentration of the ore.

B
Electrolysis

C
Reduction using carbon

D
Corrosion

Solution

The metals extracted from Earth's crust endure the process of concentration to remove impurities from the ore. Several processes, different for each metal like roasting and reduction are done to get the pure metal from it's combined state like sulphides or oxides. However, corrosion is not a step in the extraction of ore. Hence, Option $$D$$ is correct.
Question 2
1 / -0

Aluminium is used in thermite welding because it :

A
is a light metal

B
has more affinity for oxygen

C
is a strong oxidising agent

D
is a reactive metal

Solution

Thermite is the trade name for one of the granular mixtures of aluminium metal and powdered ferric oxide as the chemical affinity of Al for oxygen is the basis of thermite process. Al is common because of its high boiling point and low cost. It is used in welding process to join railway tracks.
Question 3
1 / -0

Gangue have :

A
sand and soil

B
silt

C
gravel

D
all of these

Solution

(i) Mineral is a naturally occurring substance that is solid and inorganic represented by chemical formula and has ordered structure. Minerals are differentiated based on their physical and chemical properties.
(ii) Ore is a type of rock that contains sufficient minerals with metals which are economically extracted by mining. Metal ores are generally oxides,sulphides,silicates. The ores are processed to extract metals.
(iii) Gangue are the impurities which are mixed closely with the ores. It is unwanted material which is of no market value and it is waste rock or mineral or sand etc.
Question 4
1 / -0

The major step involved in extraction of a metal after its ore is :

A
concentration

B
reduction

C
purification

D
all of these

Solution

The three steps involved in extraction are:
1) Concentration of the ore to remove impurities.
2) Reduction of the ore to get the metal.
3) Purification of the ore.
Question 5
1 / -0

Froth floatation process is used for the :

A
Oxide ores

B
Sulphide ores

C
Chloride ores

D
All of these

Solution

Froth floatation process is used for the sulphide ores. In this method, wetting of the ore by an oil takes place. A strong current of air is blown through the suspension, producing a heavy froth or foam on the surface. The metal sulphide is wetted by the oil but the gangues is not and the sulphide-oil mixture is carried to the surface by films of oil The froth is skimmed off, the gangue settles down on the bottom or remains underneath the froth.
Question 6
1 / -0

Process of removal of gangue from the ore are based on:

A
differences between physical and chemical properties of the gangue and the ore

B
difference between densities of gangue and ore

C
difference between melting point between of gangue and ore

D
all of the above

Solution

Impurities are removed prior to the extraction of metal. The process used for removal of gangue from the ore are based on the differences between physical and chemical properties of the gangue.
Question 7
1 / -0

Which if the following is a common reducing agent for extracting metals from ore?

A
$$CO$$

B
Carbon

C
Hydrogen

D
All of the above

Solution

Reduction is the process of removal of oxygen for extraction of metals from their oxide ores. The common reducing agents used for reduction of metal oxides are: Carbon monoxide, Carbon, Hydrogen.
Question 8
1 / -0

Which metal foil is used for packing of some of the medicine tablets?

A
Copper

B
Zinc

C
Aluminium

D
All of the above

Solution

Aluminium is malleable. It can be beaten into thin sheets and can also be hammered into thin foils.
Question 9
1 / -0

Though aluminium is a reactive metal it is still used for packing food articles. Why?

A
Strong affinity of aluminium towards O$$_2$$

B
Strong affinity of aluminium towards N$$_2$$

C
Aluminium is a light metal

D
None of the above

Solution

Aluminium is used in packaging industry because it is a light metal.
Question 10
1 / -0

Aluminium alloys are widely used in aircraft and ships because of :

A
their high melting point

B
their hardness

C
their high density

D
their light weight

Solution

Aluminium is ductile, malleable and lightweight, and has one third the density and stiffness of steel. It is easily machined, cast, drawn and extruded. Aluminium with magnesium alloy is used to make body of aircraft which is lightweight and resistant to corrosion.

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Re-Attempt Weekly Quiz Competition

General Principles and Processes of Isolation of Elements Test - 14

Result

General Principles and Processes of Isolation of Elements Test - 14

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SHARING IS CARING

Question 1

Concentration of the ore.

Electrolysis

Reduction using carbon

Corrosion

Solution

Question 2

is a light metal

has more affinity for oxygen

is a strong oxidising agent

is a reactive metal

Solution

Question 3

sand and soil

silt

gravel

all of these

Solution

Question 4

concentration

reduction

purification

all of these

Solution

Question 5

Oxide ores

Sulphide ores

Chloride ores

All of these

Solution

Question 6

differences between physical and chemical properties of the gangue and the ore

difference between densities of gangue and ore

difference between melting point between of gangue and ore

all of the above

Solution

Question 7

$$CO$$

Carbon

Hydrogen

All of the above

Solution

Question 8

Copper

Zinc

Aluminium

All of the above

Solution

Question 9

Strong affinity of aluminium towards O$$_2$$

Strong affinity of aluminium towards N$$_2$$

Aluminium is a light metal

None of the above

Solution

Question 10

their high melting point

their hardness

their high density

their light weight

Solution

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