Match List-I with List-II $\begin{array}{*{20}{l}} \,&{\begin{array}{*{20}{c}} {{\rm{List -I}}}\\ {\left( {{\rm{Ore}}} \right)} \end{array}}&{\,\,}&{\begin{array}{*{20}{c}} {{\rm{List - II}}}\\ {\left( {{\rm{Element \,\, present}}} \right)} \end{array}}\\ {{\rm{A}}{\rm{.}}}&{{\rm{Kernite}}}&{\,\,\,\left( {\rm{i}} \right)}&{{\rm{Tin}}}\\ {{\rm{B}}{\rm{.}}}&{{\rm{Cassiterite}}}&{\,\,\left( {{\rm{ii}}} \right)}&{{\rm{Boron}}}\\ {{\rm{C}}{\rm{.}}}&{{\rm{Calamine}}}&{\,\,\left( {{\rm{iii}}} \right)}&{{\rm{Fluorine}}}\\ {{\rm{D}}{\rm{.}}}&{{\rm{Cryolite}}}&{\,\,\left( {{\rm{iv}}} \right)}&{{\rm{Zinc}}} \end{array}$ Choose the most appropriate answer from the options given below.

$\begin{array}{*{20}{c}} {\rm{A}}&{\rm{B}}&{\rm{C}}&{\rm{D}}\\ {{\rm{(ii)}}}&{{\rm{(i)}}}&{{\rm{(iv)}}}&{{\rm{(iii)}}} \end{array}$

$\begin{array}{*{20}{c}} {\rm{A}}&{\rm{B}}&{\rm{C}}&{\rm{D}}\\ {{\rm{(i)}}}&{{\rm{(iii)}}}&{{\rm{(iv)}}}&{{\rm{(ii)}}} \end{array}$

$\begin{array}{*{20}{c}} {\rm{A}}&{\rm{B}}&{\rm{C}}&{\rm{D}}\\ {{\rm{(ii)}}}&{{\rm{(iv)}}}&{{\rm{(i)}}}&{{\rm{(iii)}}} \end{array}$

$\begin{array}{*{20}{c}} {\rm{A}}&{\rm{B}}&{\rm{C}}&{\rm{D}}\\ {{\rm{(iii)}}}&{{\rm{(i)}}}&{{\rm{(ii)}}}&{{\rm{(iv)}}} \end{array}$

Heating mixture of ${\rm{C}}{{\rm{u}}_2}{\rm{O}}\;{\rm{and}}\;{\rm{C}}{{\rm{u}}_2}{\rm{S}}$ will give

${\rm{Cu}} + {\rm{S}}{{\rm{O}}_2}$

${\rm{C}}{{\rm{u}}_2}{\rm{S}}{{\rm{O}}_3}$

${\rm{Cu}} + {\rm{S}}{{\rm{O}}_3}$

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

General principles and processes of isolation of elements practice · Medium

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1 Medium

1 of 175

Remembering +4 | -1

Following method is not used for extraction of Al

View answer and explanation

Correct option: A

Van Arkel

Option A (Van Arkel) is correct because the Van Arkel method is used for the purification of metals like Titanium (Ti) and Zirconium (Zr), not for the extraction of Aluminum (Al).

2 Medium

2 of 175

Remembering +4 | -1

Carbon reduction method is commercially used for the reduction of

View answer and explanation

Correct option: A

{ZnO}

Option A (

{ZnO}

) is correct because zinc oxide is commonly reduced by carbon in industrial processes to obtain zinc metal.

3 Medium

3 of 175

Remembering +4 | -1

The metal which is purified by zone refining is

View answer and explanation

Correct option: D

\mathrm{Ge}

Option D (

\mathrm{Ge}

) is correct because zone refining is a method specifically used to purify semiconductors like Germanium (Ge).

4 Medium

4 of 175

Remembering +4 | -1

Wolframite ore is separated from tin stone ore by the process of

View answer and explanation

Correct option: D

Smelting

Option B is correct because wolframite is magnetic and can be separated from tin stone using electromagnetic separation.

5 Medium

5 of 175

Remembering +4 | -1

An essential constituent of amalgam is:

View answer and explanation

Correct option: D

\mathrm{Hg}

Option D (Hg) is correct because mercury (Hg) is the essential constituent of amalgams, which are alloys of mercury with other metals.

6 Medium

6 of 175

Remembering +4 | -1

The chemical composition of slag formed during the smelting process in the extraction of copper is:

View answer and explanation

Correct option: B

\mathrm{FeSiO}_3

Option B (

\mathrm{FeSiO}_3

) is correct because during copper smelting, iron oxide (FeO) reacts with silica (

\mathrm{SiO}_2

) to form iron silicate (

\mathrm{FeSiO}_3

), which constitutes the slag.

7 Medium

7 of 175

Remembering +4 | -1

The ores that are concentrated by floatation method are-

View answer and explanation

Correct option: B

Sulphides

Option B (Sulphides) is correct because sulphide ores are concentrated by the froth floatation method due to their aerophilic nature.

8 Medium

8 of 175

Remembering +4 | -1

In the extraction of lead from its ore galena, an important element recovered is:

View answer and explanation

Correct option: B

\mathrm{Ag}

Option B (

\mathrm{Ag}

) is correct because silver is often found as an impurity in galena (lead sulfide ore) and is recovered during lead extraction.

9 Medium

9 of 175

Remembering +4 | -1

The ore that contains both iron and copper is

View answer and explanation

Correct option: D

copper pyrites

Option D (copper pyrites) is correct because its formula (

CuFeS_2

) contains both iron and copper.

10 Medium

10 of 175

Remembering +4 | -1

Match List-I with List-II

\begin{array}{llllllllllllllllllll} \,&{\begin{array}{cccccccccccccccccccc} {\mathrm{List -I}}\\ {\left( {\mathrm{Ore}} \right)} \end{array}}&{\,\,}&{\begin{array}{cccccccccccccccccccc} {\mathrm{List - II}}\\ {\left( {\mathrm{Element \,\, present}} \right)} \end{array}}\\ {\mathrm{A}\mathrm{.}}&{\mathrm{Kernite}}&{\,\,\,\left( \mathrm{i} \right)}&{\mathrm{Tin}}\\ {\mathrm{B}\mathrm{.}}&{\mathrm{Cassiterite}}&{\,\,\left( {\mathrm{ii}} \right)}&{\mathrm{Boron}}\\ {\mathrm{C}\mathrm{.}}&{\mathrm{Calamine}}&{\,\,\left( {\mathrm{iii}} \right)}&{\mathrm{Fluorine}}\\ {\mathrm{D}\mathrm{.}}&{\mathrm{Cryolite}}&{\,\,\left( {\mathrm{iv}} \right)}&{\mathrm{Zinc}} \end{array}

Choose the most appropriate answer from the options given below.

View answer and explanation

Correct option: B

\begin{array}{cccccccccccccccccccc} \mathrm{A}&\mathrm{B}&\mathrm{C}&\mathrm{D}\\ {\mathrm{(ii)}}&{\mathrm{(i)}}&{\mathrm{(iv)}}&{\mathrm{(iii)}} \end{array}

Option B is correct because it correctly matches each ore with the element it contains: Kernite (Boron), Cassiterite (Tin), Calamine (Zinc), and Cryolite (Fluorine).

11 Medium

11 of 175

Remembering +4 | -1

Identify the incorrect pair from the following.

View answer and explanation

Correct option: C

{{\text{Fluorspar}}}

{B{F_3}}

Option C (

{{\text{Fluorspar}}}

{B{F_3}}

) is correct because the correct formula for Fluorspar is

CaF_2

, not

BF_3

12 Medium

12 of 175

Analyzing +4 | -1

Heating mixture of

\mathrm{C}{\mathrm{u}_2}\mathrm{O}\;\mathrm{and}\;\mathrm{C}{\mathrm{u}_2}\mathrm{S}

will give

View answer and explanation

Correct option: D

\mathrm{Cu} + \mathrm{S}{\mathrm{O}_2}

The correct answer is D (

\mathrm{Cu} + \mathrm{S}{\mathrm{O}_2}

) because copper(I) oxide and copper(I) sulfide react to form copper metal and sulfur dioxide.

13 Medium

13 of 175

Remembering +4 | -1

The metal that is not extracted from its sulfide ore
is

View answer and explanation

Correct option: A

Aluminium

Option A (Aluminium) is correct because aluminium is typically extracted from bauxite ore, not sulfide ore.

14 Medium

14 of 175

Remembering +4 | -1

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

View answer and explanation

Correct option: B

Carbon

Option B (Carbon) is correct because in the Hall-Heroult process, the cathode is made of carbon, which also lines the steel tank used for electrolysis.

15 Medium

15 of 175

Remembering +4 | -1

The material used for the lining of Bessemer’s converter in the extraction of copper is:

View answer and explanation

Correct option: B

Lime

Option B (Lime) is correct because Bessemer converters often use a basic lining like lime to remove acidic impurities.

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16 Medium

16 of 175

Remembering +4 | -1

Which is not a mineral?

View answer and explanation

Correct option: B

Peat

Option B (Peat) is correct because peat is partially decayed plant matter, an organic sediment, while the others are inorganic minerals.

17 Medium

17 of 175

Understanding +4 | -1

Which of the following refining technique can be applied to obtain an element to be used as a semiconductor?

View answer and explanation

Correct option: D

Zone refining

Option D (Zone refining) is correct because zone refining is a technique used to obtain ultra-pure elements, which is essential for semiconductors.

18 Medium

18 of 175

Remembering +4 | -1

A cuprous ore among the following is

View answer and explanation

Correct option: B

Cuprite

Option B (Cuprite) is correct because cuprite (

\mathrm{Cu_2O}

) is an ore of copper containing copper in the +1 oxidation state (cuprous).

19 Medium

19 of 175

Understanding +4 | -1

Choose the false statement.

View answer and explanation

Correct option: C

Si, Ge

and

Ga

are purified by poling

Option C (

Si, Ge

and

Ga

are purified by poling) is correct because

Si, Ge

and

Ga

are purified by zone refining, not poling.

20 Medium

20 of 175

Remembering +4 | -1

Thomas slag is:

View answer and explanation

Correct option: C

Tricalcium phosphate and calcium silicate

Option C (Tricalcium phosphate and calcium silicate) is correct because Thomas slag is a mixture of tricalcium phosphate and calcium silicate, used as a fertilizer.

21 Medium

21 of 175

Remembering +4 | -1

Aluminium is extracted by the electrolysis of:

View answer and explanation

Correct option: D

Alumina mixed with cryolite

Option D (Alumina mixed with cryolite) is correct because cryolite lowers the melting point of alumina and increases its conductivity, making electrolysis feasible.

22 Medium

22 of 175

Remembering +4 | -1

Which of the following is correct?

View answer and explanation

Correct option: C

Wolframeite is

{\mathrm{FeW}{\mathrm{O}_4}}

Option C (Wolframeite is

{\mathrm{FeW}{\mathrm{O}_4}}

) is correct because Wolframite is indeed ferrous tungstate with the chemical formula

{\mathrm{FeW}{\mathrm{O}_4}}

23 Medium

23 of 175

Remembering +4 | -1

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

View answer and explanation

Correct option: C

Bessemer converter

Option C (Bessemer converter) is correct because the Bessemer process uses a Bessemer converter to reduce the carbon content in pig iron to produce steel.

24 Medium

24 of 175

Remembering +4 | -1

The reaction representing the Mond process for metal refining is ____

View answer and explanation

Correct option: B

\mathrm{Ni}+4 \mathrm{CO} \stackrel{\Delta}{\longrightarrow} \mathrm{Ni}(\mathrm{CO})_{4}

Option B (

\mathrm{Ni}+4 \mathrm{CO} \stackrel{\Delta}{\longrightarrow} \mathrm{Ni}(\mathrm{CO})_{4}

) is correct because it represents the formation of nickel tetracarbonyl, a key step in the Mond process.

25 Medium

25 of 175

Remembering +4 | -1

Calcination is used in metallurgy for removal of

View answer and explanation

Correct option: B

Water and

{CO}_2

Option B (Water and

{CO}_2

) is correct because calcination involves heating ores to remove volatile substances like water and to decompose carbonates into oxides and carbon dioxide.

26 Medium

26 of 175

Remembering +4 | -1

Thermite is a mixture of

View answer and explanation

Correct option: B

Al powder and

\mathrm{F}{\mathrm{e}_2}{\mathrm{O}_3}

Option B (Al powder and

\mathrm{F}{\mathrm{e}_2}{\mathrm{O}_3}

) is correct because thermite is a mixture of aluminum powder and iron(III) oxide.

27 Medium

27 of 175

Understanding +4 | -1

Carbon reduction method is generally not applicable for extraction of

View answer and explanation

Correct option: C

Silver

Option C (Silver) is correct because silver is typically extracted using hydrometallurgy (leaching) with cyanide, not carbon reduction.

28 Medium

28 of 175

Remembering +4 | -1

Thermite process is used in reduction of

View answer and explanation

Correct option: A

\mathrm{C}{\mathrm{r}_2}{\mathrm{O}_3}

Option A (

\mathrm{C}{\mathrm{r}_2}{\mathrm{O}_3}

) is correct because the thermite process is specifically used for reducing oxides of less electropositive metals like chromium oxide.

29 Medium

29 of 175

Analyzing +4 | -1

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: In an Ellingham diagram, the oxidation of carbon to carbon monoxide shows a negative slope with respect to temperature.
Reason R: CO tends to get decomposed at higher temperature.
In the light of the above statements, choose the correct answer from the options given below.

View answer and explanation

Correct option: B

A is correct but R is not correct

The correct answer is B (A is correct but R is not correct) because while the oxidation of carbon to carbon monoxide does show a negative slope in the Ellingham diagram, CO does not tend to decompose at higher temperatures.

30 Medium

30 of 175

Remembering +4 | -1

Rio Tinto process is used for extraction of:

View answer and explanation

Correct option: A

Option A (Cu) is correct because the Rio Tinto process is specifically designed for the extraction of copper from low-grade ore.

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 175 single-correct-answer MCQs on GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS.
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