${\rm{A}}{{\rm{l}}_2}{{\rm{O}}_3}{\rm{.}}{{\rm{H}}_2}{\rm{O}}$

${\rm{A}}{{\rm{l}}_2}{{\rm{O}}_3}.2{{\rm{H}}_2}{\rm{O}}$

${\rm{A}}{{\rm{l}}_2}{{\rm{O}}_3}.3{{\rm{H}}_2}{\rm{O}}$

${\rm{A}}{{\rm{l}}_2}{{\rm{O}}_3}$

Aluminium is extracted from alumina ${\rm{(A}}{{\rm{l}}_2}{{\rm{O}}_3})$ by electrolysis of a molten mixture of:

${\rm{A}}{{\rm{l}}_2}{{\rm{O}}_3} + {\rm{N}}{{\rm{a}}_3}{\rm{Al}}{{\rm{F}}_6} + {\rm{Ca}}{{\rm{F}}_2}$

${\rm{A}}{{\rm{l}}_2}{{\rm{O}}_3} + {\rm{KF}} + {\rm{N}}{{\rm{a}}_3}{\rm{Al}}{{\rm{F}}_6}$

${\rm{A}}{{\rm{l}}_2}{{\rm{O}}_3} + {\rm{HF}} + {\rm{NaAl}}{{\rm{F}}_4}$

${\rm{A}}{{\rm{l}}_2}{{\rm{O}}_3} + {\rm{Ca}}{{\rm{F}}_2} + {\rm{NaAl}}{{\rm{F}}_4}$

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JEE • CHEMISTRY • GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

General principles and processes of isolation of elements practice · Easy

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These sets use single-correct-answer MCQs. They do not cover every JEE Main or JEE Advanced question format and are not full-length mock papers.

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Showing 1-30 of 72 questions

1 Easy

1 of 72

Remembering +4 | -1

Which of the following is used as a stabilizer during the concentration of sulphide ores?

View answer and explanation

Correct option: D

Cresols

Option D (Cresols) is correct because cresols, along with aniline, are used as froth stabilizers during the concentration of sulfide ores in the froth floatation process.

2 Easy

2 of 72

Remembering +4 | -1

Diaspora is:

View answer and explanation

Correct option: D

\mathrm{A}{\mathrm{l}_2}{\mathrm{O}_3}\mathrm{.}{\mathrm{H}_2}\mathrm{O}

Option D (

\mathrm{A}{\mathrm{l}_2}{\mathrm{O}_3}\mathrm{.}{\mathrm{H}_2}\mathrm{O}

) is correct because the chemical formula for Diaspore is

Al_2O_3 \cdot H_2O

, which is a hydrated form of aluminum oxide.

3 Easy

3 of 72

Remembering +4 | -1

Main ore of aluminium is:

View answer and explanation

Correct option: C

Bauxite

Option C (Bauxite) is correct because Bauxite is the primary ore from which aluminum is extracted.

4 Easy

4 of 72

Remembering +4 | -1

Which reagent is used in Bayer's process?

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Correct option: C

\mathrm{NaOH}

Option C (NaOH) is correct because sodium hydroxide (NaOH) is used in Bayer's process to dissolve aluminum oxide from bauxite ore.

5 Easy

5 of 72

Remembering +4 | -1

Pig iron:

View answer and explanation

Correct option: A

Contains carbon and other impurities

Option A is correct because pig iron contains carbon and other impurities, making it different from pure iron, wrought iron, or steel.

6 Easy

6 of 72

Remembering +4 | -1

Froth floatation is a process of :

View answer and explanation

Correct option: D

Concentration

Option D (Concentration) is correct because froth floatation is a method used to concentrate sulfide ores by separating them from gangue.

7 Easy

7 of 72

Remembering +4 | -1

The inner lining of a blast furnace is made up of:

View answer and explanation

Correct option: C

Fire clay bricks

Option C (Fire clay bricks) is correct because fire clay bricks are commonly used as the inner lining of a blast furnace due to their ability to withstand high temperatures.

8 Easy

8 of 72

Remembering +4 | -1

The chemical that is added to reduce the melting point of the reaction mixture during the extraction of aluminium is

View answer and explanation

Correct option: A

cryolite

Option A (cryolite) is correct because cryolite (

Na_3AlF_6

) is added to alumina to lower its melting point during the extraction of aluminum.

9 Easy

9 of 72

Remembering +4 | -1

Which of the following metal cannot be extracted by smelting process

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Correct option: D

Aluminium

Option D (Aluminium) is correct because aluminium is extracted by electrolysis, not by smelting.

10 Easy

10 of 72

Remembering +4 | -1

Froth floatation process is based on:

View answer and explanation

Correct option: A

Wetting properties of ore particles

Option A (Wetting properties of ore particles) is correct because the froth flotation process separates minerals based on differences in their wettability by water and oil.

11 Easy

11 of 72

Remembering +4 | -1

Hall-Heroult method is used during extraction of:

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Correct option: A

Aluminium

Option A (Aluminium) is correct because the Hall-Heroult method is used for the extraction of aluminium from alumina.

12 Easy

12 of 72

Remembering +4 | -1

In the Hall’s process for extraction of Al, the ore is fused with:

View answer and explanation

Correct option: B

\mathrm{N}{\mathrm{a}_2}\mathrm{C}{\mathrm{O}_3}

Option B (

\mathrm{N}{\mathrm{a}_2}\mathrm{C}{\mathrm{O}_3}

) is correct because in Hall's process, the ore is fused with sodium carbonate to form sodium aluminate.

13 Easy

13 of 72

Remembering +4 | -1

Which substance is used as basic refractory material in furnace?

View answer and explanation

Correct option: C

\mathrm{CaO}

Option C (

\mathrm{CaO}

) is correct because Calcium Oxide (CaO) is a basic oxide and is commonly used as a basic refractory material in furnaces.

14 Easy

14 of 72

Remembering +4 | -1

The temperature of the slag zone in the metallurgy of iron using blast furnace is

View answer and explanation

Correct option: D

800 - 1000^\circ C

Option D (

800 - 1000^\circ C

) is correct because this is the temperature range of the slag zone in a blast furnace used for iron metallurgy.

15 Easy

15 of 72

Remembering +4 | -1

Which one is malachite from the following?

View answer and explanation

Correct option: D

CuC{O_3}.\,Cu{(OH)_2}

Option D (

CuC{O_3}.\,Cu{(OH)_2}

) is correct because malachite is a copper carbonate hydroxide mineral with the formula

CuC{O_3}.\,Cu{(OH)_2}

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16 Easy

16 of 72

Remembering +4 | -1

Chromium is obtained by reducing concentrated chromite ore with:

View answer and explanation

Correct option: C

Aluminium powder

Option C (Aluminium powder) is correct because the Goldschmidt process uses aluminum to reduce metal oxides.

17 Easy

17 of 72

Remembering +4 | -1

For galvanisation, the most suitable metal for plating on iron surface is

View answer and explanation

Correct option: B

Zinc

Option B (Zinc) is correct because zinc is commonly used for galvanization due to its ability to protect iron from corrosion by forming a protective layer and acting as a sacrificial anode.

18 Easy

18 of 72

Remembering +4 | -1

Method used for obtaining highly pure silicon used as a semiconductor material, is

View answer and explanation

Correct option: D

Zone refining

Option D (Zone refining) is correct because zone refining is a purification technique used to obtain highly pure silicon by repeatedly melting and recrystallizing a small region of the material.

19 Easy

19 of 72

Remembering +4 | -1

Blast furnace is used in the metallurgy of:

View answer and explanation

Correct option: B

\mathrm{Fe}

Option B (

\mathrm{Fe}

) is correct because the blast furnace is primarily used in the metallurgy of iron.

20 Easy

20 of 72

Remembering +4 | -1

In the metallurgical extraction of zinc fromZnO, the reducing agent used is?

View answer and explanation

Correct option: C

Carbon monoxide

Option C (Carbon monoxide) is correct because carbon monoxide is used as a reducing agent in the metallurgical extraction of zinc from zinc oxide.

21 Easy

21 of 72

Understanding +4 | -1

Select the ore(s) which have two different metal atoms.

View answer and explanation

Correct option: D

Both (1) and (2)

Option D (Both (1) and (2)) is correct because Chromite (

\mathrm{FeO} . \mathrm{Cr}_2 \mathrm{O}_3

) contains iron and chromium, and Chalcopyrite (

\mathrm{CuFeS}_2

) contains copper and iron.

22 Easy

22 of 72

Remembering +4 | -1

The region in which metals are found in earth is called:

View answer and explanation

Correct option: B

Lithophil

Option B (Lithophil) is correct because lithophile elements are those that prefer to be in silicate rocks (the lithosphere) and are thus found in the Earth's crust.

23 Easy

23 of 72

Remembering +4 | -1

The ore concentrated by electromagnetic separation is:

View answer and explanation

Correct option: D

All of these

Option D (All of these) is correct because Wolframite, Haematite, and Cassiterite are all ores that can be concentrated using electromagnetic separation due to their magnetic properties.

24 Easy

24 of 72

Remembering +4 | -1

Poling process is used:

View answer and explanation

Correct option: A

For the removal of

\mathrm{C}{\mathrm{u}_2}\mathrm{O}\;from\;\mathrm{Cu}

Option A (For the removal of

\mathrm{C}{\mathrm{u}_2}\mathrm{O}\;from\;\mathrm{Cu}

) is correct because the poling process is used to remove

\mathrm{C}{\mathrm{u}_2}\mathrm{O}

from copper.

25 Easy

25 of 72

Remembering +4 | -1

Which is not a mineral of aluminium?

View answer and explanation

Correct option: B

Anhydrite

Option B (Anhydrite) is correct because anhydrite is a mineral of calcium sulfate, not aluminum.

26 Easy

26 of 72

Remembering +4 | -1

Aluminium is extracted from alumina

\mathrm{(A}{\mathrm{l}_2}{\mathrm{O}_3})

by electrolysis of a molten mixture of:

View answer and explanation

Correct option: A

\mathrm{A}{\mathrm{l}_2}{\mathrm{O}_3} + \mathrm{N}{\mathrm{a}_3}\mathrm{Al}{\mathrm{F}_6} + \mathrm{Ca}{\mathrm{F}_2}

Option A (

\mathrm{A}{\mathrm{l}_2}{\mathrm{O}_3} + \mathrm{N}{\mathrm{a}_3}\mathrm{Al}{\mathrm{F}_6} + \mathrm{Ca}{\mathrm{F}_2}

) is correct because this mixture lowers the melting point of alumina and increases its conductivity, facilitating electrolysis.

27 Easy

27 of 72

Remembering +4 | -1

Chalcopyrites is an ore of

View answer and explanation

Correct option: B

Copper

Option B (Copper) is correct because chalcopyrite (

\mathrm{CuFeS}_2

) is a major ore of copper.

28 Easy

28 of 72

Remembering +4 | -1

Passivity of iron is due to the formation of thin film of….on its surface.

View answer and explanation

Correct option: A

Oxide

Option A (Oxide) is correct because the passivity of iron is due to the formation of a thin, protective layer of iron oxide (

Fe_2O_3

Fe_3O_4

) on its surface, preventing further corrosion.

29 Easy

29 of 72

Remembering +4 | -1

A common metal used as reductant for the extraction of metals from their oxides is:

View answer and explanation

Correct option: B

\mathrm{Al}

Option B (Al) is correct because aluminum is a common and effective reducing agent used in the extraction of metals from their oxides.

30 Easy

30 of 72

Remembering +4 | -1

The main reducing agent for the extraction of iron metal in a blast furnace is

View answer and explanation

Correct option: D

The correct answer is D (CO) because carbon monoxide (CO) is the main reducing agent in the blast furnace for the extraction of iron.

Revision notes and key takeaways

Review GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS in your textbook or class notes, then use this set to check your understanding.

Key Takeaways

✓ This set contains 72 single-correct-answer MCQs on GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS.
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