HARD

Earn 100

The major role of fluorspar $(C a F_{2})$ which is added in small quantity in the electrolytic reduction of alumina dissolved in fused cryolite $(N a_{3} A l F_{6})$ is

I. As a catalyst.

II. To make the fused mixture very conducting.

III. To lower the temperature of melting.

IV. To decrease the rate of oxidation of carbon at the anode.

50% studentsanswered this correctly

Important Questions on General Principles and Processes of Isolation of Metals (Metallurgy)

EASY

Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Metals (Metallurgy)>Extraction of Important Elements from their Ores

Cast iron is used for the manufacture of :

EASY

Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Metals (Metallurgy)>Extraction of Important Elements from their Ores

In the context of the Hall-Heroult process for the extraction of

Al

, which of the following statements is false?

EASY

Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Metals (Metallurgy)>Extraction of Important Elements from their Ores

The purest form of commercial iron is:

EASY

Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Metals (Metallurgy)>Extraction of Important Elements from their Ores

In the context of the Hall-Heroult process for the extraction of

Al

, which of the following statement is incorrect.

EASY

Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Metals (Metallurgy)>Extraction of Important Elements from their Ores

In the Hall-Heroult process, aluminium is formed at the cathode. The cathode is made out of:

MEDIUM

Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Metals (Metallurgy)>Extraction of Important Elements from their Ores

Identify the correct statement from the following:

EASY

Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Metals (Metallurgy)>Extraction of Important Elements from their Ores

Among the reactions

(a) - (d),

the reaction(s) that does/do not occur in the blast furnace during the extraction of iron is/are:

(a)

C a O + S i O_{2} \to C a S i O_{3}

(b)

3 F e_{2} O_{3} + C O \to 2 F e_{3} O_{4} + C O_{2}

(c)

F e O + S i O_{2} \to F e S i O_{3}

(d)

F e O \to F e + \frac{1}{2} O_{2}

EASY

Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Metals (Metallurgy)>Extraction of Important Elements from their Ores

Match the following

	List - I		List - II
(a)	Copper	(i)	Bauxite
(b)	Iron	(ii)	Malachite
(c)	Zinc	(iii)	Haematite
(d)	Aluminium	(iv)	Calamine
		(v)	Galena

The correct answer is

EASY

Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Metals (Metallurgy)>Extraction of Important Elements from their Ores

Name the process that is employed to refine aluminium.

MEDIUM

Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Metals (Metallurgy)>Extraction of Important Elements from their Ores

The form of iron obtained from blast furnace is :

MEDIUM

Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Metals (Metallurgy)>Extraction of Important Elements from their Ores

The final step for extraction of copper from copper pyrite in bessemer converter involves the reaction

EASY

Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Metals (Metallurgy)>Extraction of Important Elements from their Ores

Hall Heroult's process is given by:

EASY

Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Metals (Metallurgy)>Extraction of Important Elements from their Ores

The molecular formula of malachite ore is:

EASY

Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Metals (Metallurgy)>Extraction of Important Elements from their Ores

Among statements (a) – (d), the correct ones are :
(a) Lime stone is decomposed to

CaO

during the extraction of iron from its oxides.
(b) In the extraction of silver, silver is extracted as an anionic complex.
(c) Nickel is purified by Mond’s process.
(d)

Zr

and

Ti

are purified by Van Arkel method.

EASY

Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Metals (Metallurgy)>Extraction of Important Elements from their Ores

Copper is extracted from copper pyrites by

EASY

Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Metals (Metallurgy)>Extraction of Important Elements from their Ores

Which among following processes occurs at

1500 K

in blast furnace for extraction of iron

EASY

Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Metals (Metallurgy)>Extraction of Important Elements from their Ores

What happens during bessemerization process of extraction of copper from copper pyrites?

EASY

Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Metals (Metallurgy)>Extraction of Important Elements from their Ores

Extraction of copper by smelting uses silica as an additive to remove.

HARD

Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Metals (Metallurgy)>Extraction of Important Elements from their Ores

Which series of reactions correctly represents the chemical relations related to iron and its compound?

EASY

Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Metals (Metallurgy)>Extraction of Important Elements from their Ores

In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with:

Important Questions on General Principles and Processes of Isolation of Metals (Metallurgy)

Learn and Prepare for any exam you want !