General Principle of Extraction of Metal Test

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General Principle of Extraction of Metal Test - 6

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Question 1
4 / -1

The smelting of iron in a blast furnace involves all the following processes except :

A
combustion

B
reduction

C
slag formation

D
sublimation

Solution

The smelting of iron in a blast furnace involves all the following processes except Sublimation.

Sublimation is the transition of a substance directly from the solid to the gas phase without passing through the intermediate liquid phase.
Question 2
4 / -1

When a metal is to be extracted from its ore if the gangue associated with the ore is silica , then

A
An acidic flux is needed

B
A basic flux is needed

C
Both acidic and basic flux are needed

D
Neither of them is needed

Solution
Question 3
4 / -1

In metallurgical processes the flux used for removing acidic impurities is

A
Silica

B
Sodium chloride

C
Lime stone

D
Sodium carbonate.

Solution

Lime stone (a basic flux) is used for removing acidic impurities
Question 4
4 / -1

Roasting of copper pyrite ores is for which of the following purpose?

A
To burn off sulphur, arsenic, antimony etc. as oxides and convert all the iron and copper to their oxides.

B
To burn off arsenic, antimony etc. as oxides and burn off sulphur so that enough of it remains to combine with all the copper.

C
To burn off sulphur partially, in order to leave enough of sulphur to combine with arsenic, antimony etc. and the to convert all the iron and copper to oxides.

D
To melt arsenic and antimony sulphides etc. and remove them by liquation and to burn off sulphur partially to leave enough to combine with copper and iron.

Solution

The ore is partially roasted because, the Sulphur takes the impurities as gases and to react with remaining ore to get Copper metal undergoing auto-reduction.
Question 5
4 / -1

In the modern blast furnaces, the charge consists of a mixture of :

A
Calcined iron oxides + lime + anthracite coal

B
Calcined iron oxides + lime stone + coke

C
Hydrated iron oxides + dolomite + coke

D
Iron pyrites + lime + bituminous coal

Solution

Modern blast furnaces consists of
Question 6
4 / -1

Flux is used to remove:

A
basic impurities

B
acidic impurities

C
both acidic and basic impurities

D
None of these

Solution

Flux is used to remove acidic and basic both impurities.

Flux combines with gangue to form easily fusible mass called slag.

Acidic flux such as silica removes gangue having basic nature.

Basic flux such as Calcia, magnesia removes gangue having acidic nature.
Question 7
4 / -1

Roasting is done in

A
Blast furnace

B
Open hearth furnace

C
Electric furnace

D
None of these

Solution

Roasting is the process of heating the ore strongly in the presence of excess of air. It is generally carried in a reverberatory or blast furnace.
Question 8
4 / -1

Refractory metals are used in construction of furnaces because

A
they can withstand high temperature

B
they are chemically inert

C
their melting point is high

D
none of these

Solution

Refractory metals are used in construction of furnaces because they can withstand high temperature
Question 9
4 / -1

Function of the flux added during smelting is

A
To make ore porous

B
To remove gangue

C
To make reduction easier

D
To precipitate slag

Solution

Flux + Gangue → Slag
Question 10
4 / -1

Alumino-thermic process is used for the extraction of metals whose oxides are :

A
Fusible

B
Not easily reduced by carbon

C
Not easily reduced by hydrogen

D
Strongly basic

Solution

Alumino thermite process: Certain Oxides of Mn, Cr do not reduce by carbon due to very high melting point. They are reduced by Al.

Examples:

Cr₂O₃+2Al→2Cr+Al₂O₃

3Mn₃O₄+8Al→9Mn+4Al₂O₃

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General Principle of Extraction of Metal Test - 6

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General Principle of Extraction of Metal Test - 6

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Question 1

combustion

reduction

slag formation

sublimation

Solution

Question 2

An acidic flux is needed

A basic flux is needed

Both acidic and basic flux are needed

Neither of them is needed

Solution

Question 3

Silica

Sodium chloride

Lime stone

Sodium carbonate.

Solution

Question 4

To burn off sulphur, arsenic, antimony etc. as oxides and convert all the iron and copper to their oxides.

To burn off arsenic, antimony etc. as oxides and burn off sulphur so that enough of it remains to combine with all the copper.

To burn off sulphur partially, in order to leave enough of sulphur to combine with arsenic, antimony etc. and the to convert all the iron and copper to oxides.

To melt arsenic and antimony sulphides etc. and remove them by liquation and to burn off sulphur partially to leave enough to combine with copper and iron.

Solution

Question 5

Calcined iron oxides + lime + anthracite coal

Calcined iron oxides + lime stone + coke

Hydrated iron oxides + dolomite + coke

Iron pyrites + lime + bituminous coal

Solution

Question 6

basic impurities

acidic impurities

both acidic and basic impurities

None of these

Solution

Question 7

Blast furnace

Open hearth furnace

Electric furnace

None of these

Solution

Question 8

they can withstand high temperature

they are chemically inert

their melting point is high

none of these

Solution

Question 9

To make ore porous

To remove gangue

To make reduction easier

To precipitate slag

Solution

Question 10

Fusible

Not easily reduced by carbon

Not easily reduced by hydrogen

Strongly basic

Solution

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