${\rm{F}}{{\rm{e}}_2}{{\rm{O}}_3}$

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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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91 Hard

91 of 257

Remembering +4 | -1

The methods chiefly used for the extraction of lead and tin from their ores are respectively

View answer and explanation

Correct option: A

Self reduction and carbon reduction

Option A (Self reduction and carbon reduction) is correct because lead is extracted by self-reduction and tin by carbon reduction.

92 Medium

92 of 257

Analyzing +4 | -1

Which of the following statements about the advantage of roasting sulphide ore before reduction is true?

a. The

\Delta_{{f}} {G}^{\mathrm{o}}

of the sulphide is greater than that for

{CS}_2

and

{H}_2 {S}

b. The

\Delta {G}

is negative for roasting sulphide ore to oxide.

c. Roasting sulphide to oxide is thermodynamically feasible

d. Carbon and hydrogen are suitable reducing agents for metal sulphides

View answer and explanation

Correct option: B

a, b, and c

The correct answer is a, b, and c. Roasting sulphide ores is advantageous because the change in Gibbs free energy is negative, making it thermodynamically feasible, and the Gibbs free energy of formation of the sulphide is greater than that of CS2 and H2S. Carbon and hydrogen are not suitable reducing agents for metal sulphides.

93 Medium

93 of 257

Understanding +4 | -1

The metal oxide, which cannot be reduced to metal by carbon is

View answer and explanation

Correct option: D

{Al}_2 \mathrm{O}_3

Option D (

{Al}_2 \mathrm{O}_3

) is correct because aluminum has a higher affinity for oxygen than carbon, making it difficult to reduce with carbon.

94 Medium

94 of 257

Remembering +4 | -1

Which radioactive element is more abundant in India?

View answer and explanation

Correct option: A

Thorium

Option A (Thorium) is correct because thorium is more abundant than uranium, radium, and radon in India.

95 Medium

95 of 257

Remembering +4 | -1

Which of the following is/are vapour phase refining:
i. Van Arkel method
ii. Zone refining
iii. Mond's process

View answer and explanation

Correct option: D

Both i and iii

Option D (Both i and iii) is correct because Van Arkel method and Mond's process both involve converting the metal to a volatile compound, separating it from impurities, and then decomposing it to obtain the pure metal.

96 Easy

96 of 257

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.

97 Medium

97 of 257

Understanding +4 | -1

Identify the reaction that does not take place in a blast furnace.

View answer and explanation

Correct option: C

2\mathrm{F}{\mathrm{e}_2}{\mathrm{O}_3} + 3\mathrm{C} \to 4\mathrm{Fe} + 3\mathrm{C}{\mathrm{O}_2}

Option C (

2\mathrm{F}{\mathrm{e}_2}{\mathrm{O}_3} + 3\mathrm{C} \to 4\mathrm{Fe} + 3\mathrm{C}{\mathrm{O}_2}

) is correct because the reduction of

Fe_2O_3

primarily occurs via CO in the blast furnace, not directly with carbon.

98 Medium

98 of 257

Remembering +4 | -1

Main function of roasting is

View answer and explanation

Correct option: D

To remove volatile substance

Option D (To remove volatile substance) is correct because the main function of roasting is to remove volatile impurities from the ore.

99 Medium

99 of 257

Remembering +4 | -1

Heating of pyrite ores in air to remove Sulphur is known as:

View answer and explanation

Correct option: D

Roasting

Option D (Roasting) is correct because roasting involves heating sulfide ores in air to convert the sulfide to an oxide and release sulfur dioxide.

100 Easy

100 of 257

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.

101 Medium

101 of 257

Remembering +4 | -1

Which metal is extracted by electrolytic reduction method?

View answer and explanation

Correct option: B

Option B (Al) is correct because aluminum is extracted by electrolytic reduction of alumina.

102 Medium

102 of 257

Remembering +4 | -1

Radium is obtained from:

View answer and explanation

Correct option: A

Pitch blende

Option A (Pitch blende) is correct because radium is primarily obtained from pitchblende, a uranium-rich ore.

103 Medium

103 of 257

Remembering +4 | -1

The process in which ore is heated in air below its melting point is known as:

View answer and explanation

Correct option: A

Roasting

Option A (Roasting) is correct because roasting involves heating an ore in air below its melting point to remove volatile impurities or convert it into an oxide.

104 Hard

104 of 257

Remembering +4 | -1

Sperrylite is:

View answer and explanation

Correct option: B

\mathrm{PtA}{\mathrm{s}_2}

Option B (

\mathrm{PtA}{\mathrm{s}_2}

) is correct because Sperrylite is the mineral form of platinum diarsenide.

105 Medium

105 of 257

Understanding +4 | -1

The properties of cast iron, wrought iron and steel are different because they have:

View answer and explanation

Correct option: B

Different contents of carbon

Option B (Different contents of carbon) is correct because the carbon content significantly affects the properties of cast iron, wrought iron, and steel.

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106 Medium

106 of 257

Remembering +4 | -1

Antimony occurs mainly in form of:

View answer and explanation

Correct option: B

Stibnite

Option B (Stibnite) is correct because stibnite (

\mathrm{S}{\mathrm{b}_2}{\mathrm{S}_3}

) is the primary ore from which antimony is extracted.

107 Medium

107 of 257

Remembering +4 | -1

The actual reducing agent of hematite in blast furnace is

View answer and explanation

Correct option: B

Option B (CO) is correct because carbon monoxide is the primary reducing agent for hematite in a blast furnace.

108 Medium

108 of 257

Remembering +4 | -1

Tetraethyl lead is a –

View answer and explanation

Correct option: B

Antiknock compound

Option B (Antiknock compound) is correct because tetraethyl lead (TEL) was historically used as an antiknock agent in gasoline.

109 Medium

109 of 257

Remembering +4 | -1

Which process is used for the purification of Al metal?

View answer and explanation

Correct option: A

Hoop’s process

Option A (Hoop’s process) is correct because Hoop's process is specifically designed for the electrolytic refining of aluminum.

110 Medium

110 of 257

Remembering +4 | -1

Electrometallurgical process is used to extract

View answer and explanation

Correct option: C

\mathrm{Na}

Option C (Na) is correct because Sodium is a highly reactive metal that is typically extracted through the electrometallurgical process (electrolysis of its molten salt).

111 Medium

111 of 257

Understanding +4 | -1

Assertion: In froth floatation process sodium ethyl xanthate is used as floating agent

Reason: Sulphide ores are water soluble

View answer and explanation

Correct option: C

If Assertion is True but the Reason is False

The correct answer is C (If Assertion is True but the Reason is False) because sodium ethyl xanthate is used as a floating agent in froth floatation, but sulfide ores are generally insoluble in water.

112 Medium

112 of 257

Remembering +4 | -1

Carbon reduction is used for the extraction of:

View answer and explanation

Correct option: A

\mathrm{Fe}

Option A (

\mathrm{Fe}

) is correct because carbon reduction (smelting) is a common method for extracting iron from its oxide ores.

113 Easy

113 of 257

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.

114 Easy

114 of 257

Remembering +4 | -1

Which one of the following metals, is extracted on smelting of its ore in blast furnace?

View answer and explanation

Correct option: A

Iron

Option A (Iron) is correct because iron is extracted by smelting its ore in a blast furnace.

115 Medium

115 of 257

Remembering +4 | -1

Mispickel is the ore of:

View answer and explanation

Correct option: D

\mathrm{As}

Option D (

\mathrm{As}

) is correct because Mispickel, also known as arsenopyrite, is a sulfide mineral of iron and arsenic with the formula

\mathrm{FeAsS}

116 Medium

116 of 257

Understanding +4 | -1

In the metallurgical extraction of copper, following reaction is used:

FeO + Si{O_2} \to FeSi{O_3}

FeO\,\,{\text{and}}\,\,FeSi{O_3}

respectively are.

View answer and explanation

Correct option: D

Gangue and slag

Option D (Gangue and slag) is correct because in metallurgy, gangue is the impurity and slag is the product of flux and gangue.

117 Easy

117 of 257

Remembering +4 | -1

Which is not a basic flux

View answer and explanation

Correct option: A

Silica

Option A (Silica) is correct because silica is an acidic flux, while the others are basic fluxes.

118 Medium

118 of 257

Remembering +4 | -1

The element that can be refined by distillation is

View answer and explanation

Correct option: B

Zinc

Option B (Zinc) is correct because Zinc has a relatively low boiling point and can be purified by distillation.

119 Easy

119 of 257

Remembering +4 | -1

On the extraction of iron, the slag produced is

View answer and explanation

Correct option: D

\mathrm{CaSi}{\mathrm{O}_3}

Option D (

\mathrm{CaSi}{\mathrm{O}_3}

) is correct because it is the product of the reaction between CaO (from limestone decomposition) and silica (

\mathrm{Si}{\mathrm{O}_2}

) impurity during iron extraction.

120 Easy

120 of 257

Remembering +4 | -1

Ore pitch blende is main source of

View answer and explanation

Correct option: A

Option A is correct because pitchblende is a uranium-rich ore, and radium (Ra) is a decay product of uranium.

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.

Showing 91-120 of 257 questions

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