General Principles and Processes of Isolation of Elements Test

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General Principles and Processes of Isolation of Elements Test - 47

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Weekly Quiz Competition

Question 1
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The electrolytic reduction method for extraction of aluminium was discovered by:

A
Hoope

B
Hall and Halvoult

C
Baeyer

D
Serpeck

Solution

The process of extracting Aluminium from Alumina $$Al_2O_3$$ by electrolysis is called Hall-Heroult process. In this process Aluminium is produced at cathode which is obtained by outlet, oxygen is released at an anode. It reacts with carbon of anode producing $$CO$$ and $$CO_2$$.
Hence, the correct option is (B).
Question 2
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Alumina is not used as

A
refractory material

B
a medium in chromatography

C
abrasive

D
a white pigment

Solution
Question 3
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The purest zinc is made by:

A
Zone refining

B
Mond's process

C
Poling process

D
Van-Arkel process

Solution

Zone refining - purification of zinc.

Mond's process - purification of nickel.

Polling process - purification of copper

Van-Arkel process - purification of zirconium or titanium.
Question 4
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Directions For Questions

Minerals from which metals can be extracted economically and easily are called ores. The extraction of metals from their ores involves the following processes.
(i) Concentration.
(ii) Calcination | roasting | leaching.
(iii) Reduction.
It is carried out by one of the following methods.
(a) Carbon | carbon monoxide reduction.
(b) Self-reduction.
(c) Electropositive metal (i.e. displacment method).

...view full instructions

Which of the following is not correctly matched?

A
Red bauxite - Purification by Serpecks method.

B
Iron from haematite - Carbon monoxide reduction

C
Calamine - Carbonate ore

D
$$FeSiO_{3}$$ - Slag obtained in the extraction of copper.

Solution

Red bauxite container the impurities of iron oxides, titanium oxide and silica which are removed by Baeyer's and Hall's processes. Serpeck's method is used when bauxite contains only the impurity of silica.

Hence, option A is correct.
Question 5
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In our country, iron is obtained from the ore:

A
cassiterite

B
azurite

C
haematite

D
cryolite

Solution

In our country, iron is obtained from the ore haematite. Haematite is considered to be the most important iron ore because of its high-grade quality and lumpy nature. About 59% of haematite ore deposits are found in the Eastern Sector.

Hence, option C is correct.
Question 6
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In froth floatation process, for the purification of ores, the particles of the ore float because:

A
they are light

B
they are insoluble

C
they bear electrostatic charge

D
their surface is not easily wetted by water

Solution
Question 7
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Naturally occurring substances from which a metal can be profitably (or economically) extracted are called

A
Minerals

B
Ores

C
Gangue

D
Salts

Solution

Naturally occurring substances from which a metal can be profitably (or economically) extracted are called Ores.

Hence, Option B is correct answer.
Question 8
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Which one of the following statements is incorrect?

A
In Hall-Heroult process, the electrolyte used is molten mixture of alumina, sodium hydroxide and cryolite.

B
Lead is extracted from is cheif ore by both carbon reduction and self reduction

C
Zinc is extracted from its chief ore by carbon reduction

D
Extraction of gold involves the leaching of ore with cyanide solution followed by reduction with zinc.

Solution

The Hall–Héroult process is the major industrial process for smelting aluminum. It involves dissolving aluminum oxide (alumina) (obtained most often from bauxite, aluminium's chief ore, through the Bayer process) in molten cryolite, and electrolyzing the molten salt bath, typically in a purpose-built cell It is molten mixture of alumina and cryolite not sodium hydroxide.

(B) Lead is extracted from its chief ore by both self reduction and carbon reduction, reaction are as follows:

Self-reduction of Lead

$$PbS+2PbO\rightarrow 3Pb+SO_2$$

Carbon reduction of Sn

$$2SnO+C\rightarrow 2Sn+CO_2$$

(C) The ore is concentrated by froth floatation process using pine oil. The concentrated ore is then roasted in presence of excess of air at 1200 K. If roasting is carried out below this temperature, ZnS is converted into $$ZnSO_4$$, which convert back to ZnS during carbon reduction of roasted ore.

(D) Extraction of gold involves the leaching of ore with cyanide solution followed by reduction with zinc.

So option A is incorrect, Rest all are correct
Question 9
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Froth floatation process is used for concentration of

A
Chalcopyrite

B
Bauxite

C
Haematite

D
Calamine

Solution

Froth Floatation process is used for the purification of metals containing sulphur.
Chalcopyrite contains sulphur that's why it is concentrated by froth floatation process.
Question 10
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Carbon monoxide reacts with iron to form

A
$$ Fe(CO)_5 $$

B
$$ FeCO_2 $$

C
$$ FeO + C $$

D
$$ Fe_2O_3 +C $$

Solution

Carbon monoxide reacts with iron to form $$Fe_2O_3$$ and $$C.$$

$$ 2Fe + 3CO \quad \xrightarrow {Heat} \quad Fe_2O_3 +3C $$

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General Principles and Processes of Isolation of Elements Test - 47

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General Principles and Processes of Isolation of Elements Test - 47

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SHARING IS CARING

Question 1

Hoope

Hall and Halvoult

Baeyer

Serpeck

Solution

Question 2

refractory material

a medium in chromatography

abrasive

a white pigment

Solution

Question 3

Zone refining

Mond's process

Poling process

Van-Arkel process

Solution

Question 4

Red bauxite - Purification by Serpecks method.

Iron from haematite - Carbon monoxide reduction

Calamine - Carbonate ore

$$FeSiO_{3}$$ - Slag obtained in the extraction of copper.

Solution

Question 5

cassiterite

azurite

haematite

cryolite

Solution

Question 6

they are light

they are insoluble

they bear electrostatic charge

their surface is not easily wetted by water

Solution

Question 7

Minerals

Ores

Gangue

Salts

Solution

Question 8

In Hall-Heroult process, the electrolyte used is molten mixture of alumina, sodium hydroxide and cryolite.

Lead is extracted from is cheif ore by both carbon reduction and self reduction

Zinc is extracted from its chief ore by carbon reduction

Extraction of gold involves the leaching of ore with cyanide solution followed by reduction with zinc.

Solution

Question 9

Chalcopyrite

Bauxite

Haematite

Calamine

Solution

Question 10

$$ Fe(CO)_5 $$

$$ FeCO_2 $$

$$ FeO + C $$

$$ Fe_2O_3 +C $$

Solution

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