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

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

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

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

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

Emission of sound while bending a tin plate

Conversion of stannous salts to stannic salts

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

General principles and processes of isolation of elements practice · Mixed difficulty

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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 61-90 of 257 questions

61 Medium

61 of 257

Understanding +4 | -1

A sulphide ore is generally roasted to the oxide before reduction, because

View answer and explanation

Correct option: A

The enthalpy of formation of

{CO}_2

is more than that of

{CS}_2

The correct answer is that the enthalpy of formation of

{CO}_2

is more than that of

{CS}_2

because the more stable

{CO}_2

has a higher enthalpy of formation, making the conversion thermodynamically favorable.

62 Medium

62 of 257

Remembering +4 | -1

The major component of which of the following ore is sulphide based mineral?

View answer and explanation

Correct option: A

Sphalerite

Option A (Sphalerite) is correct because Sphalerite (ZnS) is a sulphide-based mineral, while the others are carbonate or hydroxide-based.

63 Medium

63 of 257

Remembering +4 | -1

Pig iron is converted into steel by reducing the amount of carbon contained in it, in a:

View answer and explanation

Correct option: C

Bessemer’s converter

Option C (Bessemer’s converter) is correct because the Bessemer process is specifically designed to convert pig iron into steel by reducing the carbon content through oxidation.

64 Medium

64 of 257

Remembering +4 | -1

The lining in blast furnace are made up of:

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Correct option: C

Fireclay bricks

Option C (Fireclay bricks) is correct because fireclay bricks are used to line blast furnaces due to their high resistance to heat and chemical attack.

65 Medium

65 of 257

Understanding +4 | -1

Given below are two statements.
Statement-I : Pig iron is obtained by heating cast iron with scrap iron.
Statement-II : Pig iron has a relatively lower carbon content than that of cast iron.
In the light of the above statements, choose the correct answer from the options given below.

View answer and explanation

Correct option: B

Both Statement-I and Statement-II are not correct.

Option B is correct because pig iron is used to make cast iron, and pig iron has a higher carbon content than cast iron.

66 Medium

66 of 257

Remembering +4 | -1

Which of the following is subjected to Leaching process during concentration of ore

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Correct option: A

Bauxite

Option A (Bauxite) is correct because bauxite ore is commonly concentrated using the leaching process to remove impurities like silica and iron oxides.

67 Easy

67 of 257

Remembering +4 | -1

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

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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.

68 Medium

68 of 257

Remembering +4 | -1

Wolframite ore contains:

View answer and explanation

Correct option: B

\mathrm{W}

Option B (

\mathrm{W}

) is correct because Wolframite is an ore of tungsten (W).

69 Easy

69 of 257

Remembering +4 | -1

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

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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.

70 Medium

70 of 257

Understanding +4 | -1

Assertion (A) : Reduction of

\mathrm{ZnO}

with carbon is done at

1100^{\circ} \mathrm{C}

.

Reason (R) : At this temperature,

\Delta G^{\circ}

is negative thus process is spontaneous.

View answer and explanation

Correct option: A

Both

\mathbf{A}

and

\mathbf{R}

are true and

\mathbf{R}

is the correct explanation of

\mathbf{A}

Option A is correct because the reduction of

\mathrm{ZnO}

with carbon is indeed done at around

1100^{\circ} \mathrm{C}

, and at this temperature,

\Delta G^{\circ}

is negative, making the process spontaneous.

71 Easy

71 of 257

Remembering +4 | -1

Blast furnace is used in the metallurgy of:

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Correct option: B

\mathrm{Fe}

Option B (

\mathrm{Fe}

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

72 Medium

72 of 257

Understanding +4 | -1

Assertion : Coke and flux are used in smelting.

Reason : The phenomenon in which ore is mixed with suitable flux and coke is heated to fusion is known as smelting.

View answer and explanation

Correct option: B

If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.

Option B (If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.) is correct because both coke and flux are used in smelting, and smelting involves heating the ore with flux and coke, but the reason doesn't directly explain why both are used.

73 Medium

73 of 257

Remembering +4 | -1

Cyanide process is used in the extraction of

View answer and explanation

Correct option: D

Both (a) and (c)

Option D (Both (a) and (c)) is correct because the cyanide process is used to extract both gold (Au) and silver (Ag) from their ores by forming soluble cyanide complexes.

74 Easy

74 of 257

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.

75 Easy

75 of 257

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.

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76 Easy

76 of 257

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.

77 Easy

77 of 257

Remembering +4 | -1

The ore concentrated by electromagnetic separation is:

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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.

78 Easy

78 of 257

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.

79 Easy

79 of 257

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.

80 Easy

80 of 257

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.

81 Medium

81 of 257

Remembering +4 | -1

Tin plague means-

View answer and explanation

Correct option: B

Conversion of white tin to grey tin

Option B (Conversion of white tin to grey tin) is correct because tin plague refers to the allotropic transformation of white tin to grey tin at low temperatures.

82 Medium

82 of 257

Understanding +4 | -1

The final step in the metallurgical extraction of Cu metal from Cu pyrites takes place in a Bessemer converter. The reaction taking place is:

View answer and explanation

Correct option: C

2\mathrm{C}{\mathrm{u}_2}\mathrm{O} + \mathrm{C}{\mathrm{u}_2}\mathrm{S} \to 6\mathrm{Cu} + \mathrm{S}{\mathrm{O}_2}

Option C is correct because the final step in copper extraction from copper pyrites involves the auto-reduction of cuprous oxide and cuprous sulfide to produce copper and sulfur dioxide.

83 Medium

83 of 257

Understanding +4 | -1

Alloy formation gives rise to:

View answer and explanation

Correct option: D

All are correct

Option D (All are correct) is correct because alloy formation typically leads to decreased corrosion, increased hardness, and decreased conductivity compared to the pure metals.

84 Medium

84 of 257

Remembering +4 | -1

Stainless steel has iron and

View answer and explanation

Correct option: A

Option A (Cr) is correct because stainless steel is an alloy of iron and chromium, which provides corrosion resistance.

85 Medium

85 of 257

Remembering +4 | -1

Which of the following metal is extracted by the amalgamation process?

View answer and explanation

Correct option: B

Silver

Option B (Silver) is correct because the amalgamation process is specifically used for the extraction of silver from its ore.

86 Medium

86 of 257

Remembering +4 | -1

Which is not essential for rusting?

View answer and explanation

Correct option: C

Carbon dioxide

Option C (Carbon dioxide) is correct because while carbon dioxide can enhance rusting, it is not essential. Oxygen, water, and iron are all essential for the rusting process.

87 Medium

87 of 257

Remembering +4 | -1

The powdered ore is agitated with water or washed with running steam of water. The heavy ore particles
and lighter impurities are separated. This method of concentration is known a

View answer and explanation

Correct option: C

Gravity separation

Option C (Gravity separation) is correct because gravity separation relies on the difference in densities between the ore particles and the impurities (gangue).

88 Easy

88 of 257

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.

89 Medium

89 of 257

Remembering +4 | -1

Spelter is:

View answer and explanation

Correct option: A

Impure zinc

Option A (Impure zinc) is correct because spelter refers to impure zinc obtained during the metallurgy of zinc.

90 Medium

90 of 257

Remembering +4 | -1

In froth floatation process many chemicals (frother, collector, activator and depressant) are used. Which is called a frother?

View answer and explanation

Correct option: C

Pine oil

The correct answer is C (Pine oil) because pine oil reduces the surface tension of water, allowing for froth formation in the froth floatation process.

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.

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