General Principles and Processes of Isolation of Elements Test

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General Principles and Processes of Isolation of Elements Test - 11

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Weekly Quiz Competition

Question 1
1 / -0

Reaction takes place in aluminothermic process is also known as _______ .

A
thermite reaction

B
thermal reaction

C
decomposition reactions

D
catalytic reaction

Solution

Thermite reaction also known as Goldschmidt reaction is a highly exothermic reaction which involves reaction between iron oxide(rust) with aluminium to produce molten iron.
Question 2
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Complete the following statement with an appropriate word/term to be filled in the blank space.

Froth floatation process is used for the concentration of _________ ores.

A
Sulphide

B
Oxide

C
Carbonate

D
All the above

Solution

Froth flotation is a process for selectively separating hydrophobic materials from hydrophilic.

In this, sulphide ores of copper, zinc and lead are concentrated by preferential wetting of ore by pine oil.

Option A is correct.
Question 3
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The earthy impurities present in the mineral are called:

A
flux

B
slag

C
gangue

D
refractory material

Solution

Impurities like sand, mud, etc. are earthy impurities and are called gangue.
Question 4
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The olive oil used in froth floatation process is called :

A
frothing agent

B
collecting agent

C
conditioning agent

D
lubricating agent

Solution

Olive oil are usually organic surfactants, the molecules of which have a polar and nonpolar group and are adsorbed along the surface of the gas-liquid interface, thereby reducing surface tension.
Question 5
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Which of the following metal occurs in native state?

A
Ca

B
Au

C
Zn

D
Al

Solution

Gold because of its inert nature does not combine with oxygen, hydrogen or humidity easily and thus occur in native state or free state.
Question 6
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Froth flotation method is used for the concentration of:

A
oxide ores

B
sulphide ores

C
sulphate ores

D
halide ores

Solution

Froth floatation is based on the principle of the difference in the wetting properties of the ore and gangue particles with the water and oil. This method is used for those metals whose ore gets preferably wet by the oil and the gangue by the water. The sulphide ores get preferably wet by the oil and the gangue with the water.
Question 7
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The formula of the most abundant salt of sodium in nature is:

A
$$NaNO_{3}$$

B
$$NaCl$$

C
$$Na_{2}CO_{3}$$

D
$$Na_{2}SO_{4}$$

Solution

The most abundant salt of sodium in nature is sodium chloride (NaCl).
Question 8
1 / -0

Unwanted material with ore is called as ______ .

A
Gangue

B
Rust

C
Slag

D
Silica

Solution

Ores contain some impurities in the form of clay or rocky material known as gangue.
Question 9
1 / -0

In the Castner's process of extraction of sodium, the cathode is:

A
iron rod

B
nickel rod

C
copper rod

D
graphite rod

Solution

In the Castner process for the extraction of sodium, the cathode is made of iron.
Question 10
1 / -0

The electrolyte used in electrolytic refining of impure aluminium is __________.

A
$$AI_2O_{3} + CaF_{2}$$

B
$$Na_{3}AlF_{6} + CaF_{2}$$

C
$$Al_2O_{3}, Na_{3}AlF_{6} and CaF_{2}$$

D
Any aluminium salt is molten state

Solution

In the metallurgy of aluminium, purified $$Al_2O_3$$ is mixed with $$Na_3AlF_6$$ or $$CaF_2$$ which lowers the melting point of the mix and brings conductivity.

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Re-Attempt Weekly Quiz Competition

General Principles and Processes of Isolation of Elements Test - 11

Result

General Principles and Processes of Isolation of Elements Test - 11

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SHARING IS CARING

Question 1

thermite reaction

thermal reaction

decomposition reactions

catalytic reaction

Solution

Question 2

Sulphide

Oxide

Carbonate

All the above

Solution

Question 3

flux

slag

gangue

refractory material

Solution

Question 4

frothing agent

collecting agent

conditioning agent

lubricating agent

Solution

Question 5

Ca

Au

Zn

Al

Solution

Question 6

oxide ores

sulphide ores

sulphate ores

halide ores

Solution

Question 7

$$NaNO_{3}$$

$$NaCl$$

$$Na_{2}CO_{3}$$

$$Na_{2}SO_{4}$$

Solution

Question 8

Gangue

Rust

Slag

Silica

Solution

Question 9

iron rod

nickel rod

copper rod

graphite rod

Solution

Question 10

$$AI_2O_{3} + CaF_{2}$$

$$Na_{3}AlF_{6} + CaF_{2}$$

$$Al_2O_{3}, Na_{3}AlF_{6} and CaF_{2}$$

Any aluminium salt is molten state

Solution

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