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

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

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

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

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 · 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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1 Easy

1 of 257

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 Hard

2 of 257

Understanding +4 | -1

Which statement is correct?

View answer and explanation

Correct option: D

Fluxes are carefully choosen to combine with the gangue present in the ore to produce easily fusible slag to carry away the impurities

Option D (Fluxes are carefully choosen to combine with the gangue present in the ore to produce easily fusible slag to carry away the impurities) is correct because it accurately describes the role of fluxes in metallurgy.

3 Easy

3 of 257

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.

4 Medium

4 of 257

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).

5 Medium

5 of 257

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.

6 Medium

6 of 257

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).

7 Medium

7 of 257

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.

8 Easy

8 of 257

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.

9 Medium

9 of 257

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.

10 Medium

10 of 257

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.

11 Medium

11 of 257

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.

12 Hard

12 of 257

Analyzing +4 | -1

Assertion (A): In the extraction of

{Ag}

by Cyanide process, Air must be blown in the disolution of

{Ag}_2 {S}

in dil.

{NaCN}

Reason (R): Continuous air blow oxidises

{Na}_2{S}

{Na}_2 {SO}_3

and prevents reaction between

{Na}_3{S}

and

{Na}\left[{Ag}({CN})_2\right]

View answer and explanation

Correct option: A

Both (A) and (R) are true and (R) is the correct explanation of (A)

Option A is correct because both the assertion and the reason are true, and the reason correctly explains why air is blown in the cyanide process to extract silver.

13 Medium

13 of 257

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.

14 Medium

14 of 257

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.

15 Hard

15 of 257

Remembering +4 | -1

Match the compound with the metal for which it is used for the process of extraction.

(i)

\mathrm{NaCN}

- (a) Titanium

(ii) Iodine - (b) Aluminium

(iii) Cryolite - (c) Silver ore

View answer and explanation

Correct option: A

(i) - (c), (ii)-(a), (iii)-(b)

Option A is correct because it accurately matches the compounds with the metals they are used to extract: NaCN for Silver, Iodine for Titanium, and Cryolite for Aluminium.

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16 Medium

16 of 257

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).

17 Medium

17 of 257

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

18 Medium

18 of 257

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.

19 Medium

19 of 257

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.

20 Medium

20 of 257

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.

21 Medium

21 of 257

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.

22 Medium

22 of 257

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.

23 Easy

23 of 257

Remembering +4 | -1

Which reagent is used in Bayer's process?

View answer and explanation

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.

24 Medium

24 of 257

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.

25 Medium

25 of 257

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).

26 Medium

26 of 257

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.

27 Easy

27 of 257

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.

28 Medium

28 of 257

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.

29 Easy

29 of 257

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.

30 Easy

30 of 257

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.

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 257 single-correct-answer MCQs on GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS.
✓ Try each question before opening its answer. Read the explanation where one is available.
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