Extraction of Elements Test

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Extraction of Elements Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

In the context of the Hall-Heroult process for the extraction of Al, which of the following statements is false?

A
CO and CO₂ are produced in this process

B
Al₂O₃ is mixed with CaF₂ which lowers the melting point of the mixture and brings conductivity

C
Al³⁺ is reduced at the cathode to form Al

D
Na₃AIF₆ serves as the electrolyte

Solution

(1) In this process, carbon anode is oxidised to CO and CO₂.
(2) It is a fact
(3) At cathode, Al³⁺ from Al₂O₃ is reduced to Al.
(4) Al₂O₃ is the electrolyte, which is undergoing the redox process. So, Al₂O₃ serves as electrolyte and Na₃AIF₆, although an electrolyte, serves as solvent.
Hence, option D is correct
Question 2
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In order to refine blister copper it is melted in a furnace and is stirred with green logs of wood. The purpose is

A
To expel the dissolved gases in blister copper

B
To bring the impurities to surface and oxidize them

C
To increase the carbon content of copper

D
To reduce the metallic oxide impurities with hydrocarbon gases liberated from the wood.

Solution

The blister copper is melted in reverberatory furnace and stirred with poles of green wood. Any oxide of copper formed is reduced to metallic copper by the reducing hydrocarbons of the wood. The process is called fire refining or poling.
Hence, option D is correct.
Question 3
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Which of the following statements is not correct?

A
All ores are minerals

B
All minerals are ores

C
All ores consists of gangue

D
mineral consists of formula

Solution

Minerals are the naturally occurring substances of metals whereas the ores are those minerals from which a metal can be extracted profitably. Thus, we can say that all ores are the minerals but all minerals are not the ores.

Hence, the correct option is B.
Question 4
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Which of the ore dressing process requires finest size of ore.

A
froth floatation

B
gravity separation

C
magnetic separation

D
All

Solution

During the dressing of ore the particle size should be smallest
Question 5
1 / -0

The anode mud obtained during electrolytic refining of Cu contains –

A
Fe

B
Ni

C
Ag

D
Zn

Solution

The anode mud obtained during electrolytic refining of Cu contains silver
Question 6
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Which of the following condition is more favorable for rusting of iron–

A
Presence of moisture

B
Presence of a weakly acidic atmosphere

C
Presence of impurity in the iron

D
All of these

Solution

Presence of moisture, presence of a weakly acidic atmosphere, presence of impurity in the iron, all these conditions are responsible for the rusting of iron.
Question 7
1 / -0

In electro-refining the impure metal is made as

A
Cathode

B
Anode

C
Electrolyte

D
A & C

Solution

Impure metal in anode is converted into its cation, and is deposited on cathode.

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Extraction of Elements Test - 3

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Question 1

CO and CO2 are produced in this process

Al2O3 is mixed with CaF2 which lowers the melting point of the mixture and brings conductivity

Al3+ is reduced at the cathode to form Al

Na3AIF6 serves as the electrolyte

Solution

Question 2

To expel the dissolved gases in blister copper

To bring the impurities to surface and oxidize them

To increase the carbon content of copper

To reduce the metallic oxide impurities with hydrocarbon gases liberated from the wood.

Solution

Question 3

All ores are minerals

All minerals are ores

All ores consists of gangue

mineral consists of formula

Solution

Question 4

froth floatation

gravity separation

magnetic separation

All

Solution

Question 5

Fe

Ni

Ag

Zn

Solution

Question 6

Presence of moisture

Presence of a weakly acidic atmosphere

Presence of impurity in the iron

All of these

Solution

Question 7

Cathode

Anode

Electrolyte

A & C

Solution

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CO and CO₂ are produced in this process

Al₂O₃ is mixed with CaF₂ which lowers the melting point of the mixture and brings conductivity

Al³⁺ is reduced at the cathode to form Al

Na₃AIF₆ serves as the electrolyte