General Principles and Processes of Isolation of Elements Test

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General Principles and Processes of Isolation of Elements Test - 6

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Weekly Quiz Competition

Question 1
4 / -1

Observe the following statements regarding purification of bauxite.
I. During Hall's process, silica is removed as Si (vapour).
II. Bauxite ore contaminated with Fe₂O₃ is purified in Baeyer's process.
III. During Serpeck's process, AIN is formed.
The correct answer is

A
I, II and III

B
I and II

C
I and III

D
II and III
Question 2
4 / -1

From the Ellingham graph on carbon, which of the following statements is false?

A
CO reduces Fe₂O₃ to Fe at less than 983 K

B
CO is less stable than CO₂ at more than 983 K

C
CO reduces Fe₂O₃ to Fe in the reduction zone of blast furnace

D
CO₂ is more stable than CO at less than 983 K

Solution
Question 3
4 / -1

Carbon cannot be used in the reduction of Al₂O₃ because

A
it is an expensive proposition

B
the enthalpy of formation of CO₂ is more than that of Al₂O₃

C
pure carbon is not easily available

D
the enthalpy of formation of Al₂O₃ is too high
Question 4
4 / -1

When copper pyrites is roasted in excess of air, a mixture of CuO + FeO is formed. FeO is present as impurities. This can be removed as slag during reduction of CuO. The flux added to form slag is

A
SiO₂, which is an acidic flux

B
limestone, which is a basic flux

C
SiO₂, which is a basic flux

D
CaO, which is a basic flux
Question 5
4 / -1

During the extraction of gold, the following reactions take place

A
[Au (CN)₂]^- and [Zn (CN)₆]^4-

B
[Au (CN)₄]^2- and [Zn (CN)₄ ]^2-

C
[Au (CN)₄]^3- and [Zn (CN)₄]^2-

D
[Au (CN)₂]^- and [Zn (CN)₄]^2-

Solution
Question 6
4 / -1

The metallurgical process in which a metal is obtained in a fused state is called

A
Smelting

B
Roasting

C
Calcination

D
Froth floatation
Question 7
4 / -1

Sulphide ore of zinc/copper is concentrated by

A
Floatation process

B
Electromagnetic process

C
Gravity separation

D
Distillation
Question 8
4 / -1

Cyanide process is used for obtaining

A
Cr

B
Ag

C
Cu

D
Zn
Question 9
4 / -1

Which of the following is not an ore?

A
Bauxite

B
Malachite

C
Zinc blende

D
Pig iron
Question 10
4 / -1

Which method of purification is represented by the following equations ?

A
Cupellation

B
Poling

C
Van Arkel

D
Zone refining

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General Principles and Processes of Isolation of Elements Test - 6

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General Principles and Processes of Isolation of Elements Test - 6

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Question 1

I, II and III

I and II

I and III

II and III

Question 2

CO reduces Fe2O3 to Fe at less than 983 K

CO is less stable than CO2 at more than 983 K

CO reduces Fe2O3 to Fe in the reduction zone of blast furnace

CO2 is more stable than CO at less than 983 K

Solution

Question 3

it is an expensive proposition

the enthalpy of formation of CO2 is more than that of Al2O3

pure carbon is not easily available

the enthalpy of formation of Al2O3 is too high

Question 4

SiO2, which is an acidic flux

limestone, which is a basic flux

SiO2, which is a basic flux

CaO, which is a basic flux

Question 5

[Au (CN)2]- and [Zn (CN)6]4-

[Au (CN)4]2- and [Zn (CN)4 ]2-

[Au (CN)4]3- and [Zn (CN)4]2-

[Au (CN)2]- and [Zn (CN)4]2-

Solution

Question 6

Smelting

Roasting

Calcination

Froth floatation

Question 7

Floatation process

Electromagnetic process

Gravity separation

Distillation

Question 8

Cr

Ag

Cu

Zn

Question 9

Bauxite

Malachite

Zinc blende

Pig iron

Question 10

Cupellation

Poling

Van Arkel

Zone refining

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CO reduces Fe₂O₃ to Fe at less than 983 K

CO is less stable than CO₂ at more than 983 K

CO reduces Fe₂O₃ to Fe in the reduction zone of blast furnace

CO₂ is more stable than CO at less than 983 K

the enthalpy of formation of CO₂ is more than that of Al₂O₃

the enthalpy of formation of Al₂O₃ is too high

SiO₂, which is an acidic flux

SiO₂, which is a basic flux

[Au (CN)₂]^- and [Zn (CN)₆]^4-

[Au (CN)₄]^2- and [Zn (CN)₄ ]^2-

[Au (CN)₄]^3- and [Zn (CN)₄]^2-

[Au (CN)₂]^- and [Zn (CN)₄]^2-