General Principles and Processes of Isolation of Elements Test

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General Principles and Processes of Isolation of Elements Test - 19

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Weekly Quiz Competition

Question 1
1 / -0

In the Castner process for the extraction of sodium, the anode is made of:

A
copper

B
iron

C
sodium

D
nickel

Solution

In the Castner process for the extraction of sodium, the anode is made of nickel metal. The schematic is shown in the attached image.
Question 2
1 / -0

The froth floatation process is used for the concentration of:

A
ore having low density

B
ore having magnetic nature

C
ore having high density

D
ore having water soluble gangue

Solution

The froth floatation process is used for the concentration of ore having low density as the metallic ore particles are preferentially wetted by the oil and rise to the surface along with the froth.

Option A is correct.
Question 3
1 / -0

Chile salt petre is the nitrate mineral of :

A
potassium

B
sodium

C
calcium

D
lithium

Solution

Chile salt petre is a nitrate salt of sodium. Its formula is $$NaNO_3$$.
Question 4
1 / -0

Froth floatation process for the concentration of sulphide ores is an illustration of the practical application of:

A
adsorption

B
absorption

C
sedimentation

D
coagulation

Solution

Froth flotation process for the concentration of sulphide ores illustrates the application of adsorption because in this process ores are adsorbed on the surface of the froth collector.

Option A is correct.
Question 5
1 / -0

The method of zone refining of metals is based on the principle of:

A
greater mobility of the pure metal than that of impurity

B
higher melting point of the impurity than that of the pure metal

C
greater noble character of the solid metal than that of the impurity

D
greater solubility of the impurity in the molten state than in the solid state

Solution

This method is based on the principle that the impurities are more soluble in the melt than in the solid state of the metal. A circular mobile heater is fixed at one end of a rod of the impure metal.

The molten zone moves along with the heater which is moved forward.

As the heater moves forward, the pure metal crystallises out of the melt and the impurities pass on into the adjacent molten zone.

Option D is correct.
Question 6
1 / -0

Molecular formula of Glauber salt is:

A
$$CuSO_{4}.5H_{2}O$$

B
$$MgSO_{4}.7H_{2}O$$

C
$$Na_{2}SO_{4}.10H_{2}O$$

D
$$FeSO_{4}.7H_{2}O$$

Solution

Glauber salt is a colourless crystalline solution $$Na_{2}SO_{4}.10H_{2}O$$.
Question 7
1 / -0

The cathode used in the electrolytic cell during aluminium extraction is made of ____________.

A
aluminium

B
carbon Iining

C
iron

D
steel

Solution

The cathode used in the electrolytic cell during aluminium extraction is graphite lining (carbon lining).
Question 8
1 / -0

Given below are the steps for extraction of copper from its ore. The balance reaction involved in reduction of copper(I) oxide with copper(I) sulphide is given in the reaction below.

$$2Cu_{2}O + Cu_{2}S \xrightarrow{Heat} 6Cu + SO_{2}$$.

This reaction is known as:

A
auto-reduction

B
catalytic- reduction

C
acid reduction

D
none of these

Solution

Auto-reduction is a process in which sulphide ores of less electropositive metals like Hg, Pb, Cu etc., are heated in air so as to convert part of the ore into oxide or sulphate which then reacts with the remaining of sulphide ore in absence of air to give the metal and sulphur dioxide.
Question 9
1 / -0

Ellingham diagram represents the change in:

A
$$ G$$ with temperature

B
$$ H$$ with temperature

C
$$ G$$ with pressure

D
$$G-T S$$ with temperature

Solution

Ellingham diagram represents the change in free energy $$(\Delta G)$$ with temperature.

An Ellingham diagram is a graph showing the temperature dependence of the stability for compounds. This analysis is usually used to evaluate the ease of reduction of metal oxides and sulphides.

The diagrams are useful in predicting the conditions under which an ore will be reduced to its metal. The analysis is thermodynamic in nature and ignores reaction kinetics. Thus, processes that are predicted to be favourable by the Ellingham diagram can still be slow.

Option A is correct.
Question 10
1 / -0

ASSERTION: In froth floatation process, sodium ethyl xanthate is used as a collector.
REASON: Sulphide ores are water soluble.

A
If both assertion and reason are CORRECT, and the reason is the CORRECT explanation of the assertion.

B
If both assertion and reason are CORRECT, but the reason is NOT the CORRECT explanation of the assertion.

C
If assertion is CORRECT but reason is INCORRECT.

D
If assertion is INCORRECT but reason is CORRECT.

Solution

Froth Flotation: The process is based on the principle of preferential wetting of ore particles by the oil and gangue by water. In this process, sodium ethyl xanthate is used as a collector.
The sulfide ores are highly insoluble in water.

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Re-Attempt Weekly Quiz Competition

General Principles and Processes of Isolation of Elements Test - 19

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General Principles and Processes of Isolation of Elements Test - 19

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SHARING IS CARING

Question 1

copper

iron

sodium

nickel

Solution

Question 2

ore having low density

ore having magnetic nature

ore having high density

ore having water soluble gangue

Solution

Question 3

potassium

sodium

calcium

lithium

Solution

Question 4

adsorption

absorption

sedimentation

coagulation

Solution

Question 5

greater mobility of the pure metal than that of impurity

higher melting point of the impurity than that of the pure metal

greater noble character of the solid metal than that of the impurity

greater solubility of the impurity in the molten state than in the solid state

Solution

Question 6

$$CuSO_{4}.5H_{2}O$$

$$MgSO_{4}.7H_{2}O$$

$$Na_{2}SO_{4}.10H_{2}O$$

$$FeSO_{4}.7H_{2}O$$

Solution

Question 7

aluminium

carbon Iining

iron

steel

Solution

Question 8

auto-reduction

catalytic- reduction

acid reduction

none of these

Solution

Question 9

$$ G$$ with temperature

$$ H$$ with temperature

$$ G$$ with pressure

$$G-T S$$ with temperature

Solution

Question 10

If both assertion and reason are CORRECT, and the reason is the CORRECT explanation of the assertion.

If both assertion and reason are CORRECT, but the reason is NOT the CORRECT explanation of the assertion.

If assertion is CORRECT but reason is INCORRECT.

If assertion is INCORRECT but reason is CORRECT.

Solution

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