Question 1: Palette 1/109

JEE Mains 2025 MCQ

The purification method based on the following physical transformation is :

$\underset{(X)}{\text { Solid }} \xrightarrow[]{\text { Heat }} \underset{(X)}{\text { Vapour }} \xrightarrow{\text { Cool }} \underset{(X)}{\text { Solid }}$

A

Extraction

B

Crystallization

C

Distillation

D

Sublimation

Question 2: Palette 2/109

JEE Mains 2023 MCQ

Which one of the following is not an example of calcination?

A

$\mathrm{CaCO}_{3} \cdot \mathrm{MgCO}_{3} \stackrel{\Delta}{\longrightarrow} \mathrm{CaO}+\mathrm{MgO}+2 \mathrm{CO}_{2}$

B

$2 \mathrm{PbS}+3 \mathrm{O}_{2} \stackrel{\Delta}{\longrightarrow} 2 \mathrm{PbO}+2 \mathrm{SO}_{2}$

C

$\mathrm{CaCO}_{3} \stackrel{\Delta}{\longrightarrow} \mathrm{CaO}+\mathrm{CO}_{2}$

D

$\mathrm{Fe}_{2} \mathrm{O}_{3} \cdot \mathrm{xH}_{2} \mathrm{O} \stackrel{\Delta}{\longrightarrow} \mathrm{Fe}_{2} \mathrm{O}_{3}+\mathrm{xH}_{2} \mathrm{O}$

Question 3: Palette 3/109

JEE Mains 2023 MCQ

Given below are two statements related to Ellingham diagram:

Statement I : Ellingham diagrams can be constructed for formation of oxides, sulfides and halides of metals.

Statement II : It consists of plots of $\Delta_{\mathrm{f}} \mathrm{H}^{0}$ vs $\mathrm{T}$ for formation of oxides of elements.

In the light of the above statements, choose the most appropriate answer from the options given below:

A

Both Statement I and Statement II are correct

B

Both Statement I and Statement II are incorrect

C

Statement I is correct but Statement II is incorrect

D

Statement I is incorrect but Statement II is correct

Question 4: Palette 4/109

JEE Mains 2023 MCQ

Which one of the following is most likely a mismatch ?

A

Titanium - van Arkel Method

B

Zinc - Liquation

C

Nickel - Mond process

D

Copper - Electrolysis

Question 5: Palette 5/109

JEE Mains 2023 MCQ

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R

Assertion A : In the Ellingham diagram, a sharp change in slope of the line is observed for $\mathrm{Mg} \rightarrow \mathrm{MgO}$ at $\sim 1120^{\circ} \mathrm{C}$

Reason R: There is a large change of entropy associated with the change of state

In the light of the above statements, choose the correct answer from the options given below

A

Both $\mathbf{A}$ and $\mathbf{R}$ are true and $\mathbf{R}$ is the correct explanation of $\mathbf{A}$

B

$\mathbf{A}$ is false but $\mathbf{R}$ is true

C

Both $\mathbf{A}$ and $\mathbf{R}$ are true but $\mathbf{R}$ is NOT the correct explanation of $\mathbf{A}$

D

$\mathbf{A}$ is true but $\mathbf{R}$ is false

Question 6: Palette 6/109

JEE Mains 2023 MCQ

Given below are two statements :

Statement I : In the metallurgy process, sulphide ore is converted to oxide before reduction.

Statement II : Oxide ores in general are easier to reduce.

In the light of the above statements, choose the most appropriate answer from the options given below:

A

Both Statement I and Statement II are correct

B

Both Statement I and Statement II are incorrect

C

Statement I is correct but Statement II is incorrect

D

Statement I is incorrect but Statement II is correct

Question 7: Palette 7/109

JEE Mains 2023 MCQ

In the extraction process of copper, the product obtained after carrying out the reactions

(i) $2 \mathrm{Cu}_{2} \mathrm{~S}+3 \mathrm{O}_{2} \rightarrow 2 \mathrm{Cu}_{2} \mathrm{O}+2 \mathrm{SO}_{2}$

(ii) $2 \mathrm{Cu}_{2} \mathrm{O}+\mathrm{Cu}_{2} \mathrm{~S} \rightarrow 6 \mathrm{Cu}+\mathrm{SO}_{2}$ is called

A

Copper matte

B

Blister copper

C

Reduced copper

D

Copper scrap

Question 8: Palette 8/109

JEE Mains 2023 MCQ

Gibbs energy vs T plot for the formation of oxides is given below.

For the given diagram, the correct statement is -

A

At $600^{\circ} \mathrm{C}, \mathrm{C}$ can reduce $\mathrm{FeO}$

B

At $600{ }^{\circ} \mathrm{C}, \mathrm{C}$ can reduce $\mathrm{ZnO}$

C

At $600^{\circ} \mathrm{C}, \mathrm{CO}$ can reduce $\mathrm{ZnO}$

D

At $600{ }^{\circ} \mathrm{C}, \mathrm{CO}$ cannot reduce $\mathrm{FeO}$

Question 9: Palette 9/109

JEE Mains 2023 MCQ

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

A

Cresols

B

Xanthates

C

Fatty acids

D

Pine oils

Question 10: Palette 10/109

JEE Mains 2023 MCQ

In Hall - Heroult process, the following is used for reducing $\mathrm{Al}_{2} \mathrm{O}_{3}$ :-

A

Magnesium

B

$\mathrm{CaF}_{2}$

C

Graphite

D

$\mathrm{Na}_{3} \mathrm{AlF}_{6}$

Question 11: Palette 11/109

JEE Mains 2023 MCQ

Which of the following metals can be extracted through alkali leaching technique?

A

$\mathrm{Sn}$

B

Cu

C

$\mathrm{Au}$

D

$\mathrm{Pb}$

Question 12: Palette 12/109

JEE Mains 2023 MCQ

The setting time of Cement is increased by adding :

A

Gypsum

B

Limestone

C

Clay

D

Silica

Question 13: Palette 13/109

JEE Mains 2023 MCQ

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

A

A is correct but R is not correct

B

Both A and R are correct but R is NOT the correct explanation of A

C

A is not correct but R is correct

D

Both A and R are correct and R is the correct explanation of A

Question 14: Palette 14/109

JEE Mains 2023 MCQ

Which one of the following statements is incorrect?

A

Cast iron is obtained by melting pig iron with scrap iron and coke using hot air blast.

B

The malleable iron is prepared from cast iron by oxidising impurities in a reverberatory furnace.

C

van Arkel method is used to purify tungsten.

D

Boron and Indium can be purified by zone refining method.

Question 15: Palette 15/109

JEE Mains 2023 MCQ

The methods NOT involved in concentration of ore are

A. Liquation

B. Leaching

C. Electrolysis

D. Hydraulic washing

E. Froth floatation

Choose the correct answer from the options given below :

A

A and C only

B

C, D and E only

C

B, D and C only

D

B, D and E only

Question 16: Palette 16/109

JEE Mains 2023 MCQ

Given below are two statements:

Statement I: During Electrolytic refining, the pure metal is made to act as anode and its impure metallic form is used as cathode.

Statement II: During the Hall-Heroult electrolysis process, purified $\mathrm{Al}_{2} \mathrm{O}_{3}$ is mixed with $\mathrm{Na}_{3} \mathrm{AlF}_{6}$ to lower the melting point of the mixture.

In the light of the above statements, choose the most appropriate answer from the options given below:

A

Statement $\mathrm{I}$ is correct but Statement II is incorrect

B

Statement I is incorrect but Statement II is correct

C

Both Statement I and Statement II are incorrect

D

Both Statement I and Statement II are correct

Question 17: Palette 17/109

JEE Mains 2023 MCQ

In the extraction of copper, its sulphide ore is heated in a reverberatory furnace after mixing with silica to:

A

remove $\mathrm{FeO}$ as $\mathrm{FeSiO}_{3}$

B

remove calcium as $\mathrm{CaSiO}_{3}$

C

decrease the temperature needed for roasting of $\mathrm{Cu}_{2} \mathrm{~S}$

D

separate $\mathrm{CuO}$ as $\mathrm{CuSiO}_{3}$

Question 18: Palette 18/109

JEE Mains 2023 MCQ

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

A

Sphalerite

B

Siderite

C

Malachite

D

Calamine

Question 19: Palette 19/109

JEE Mains 2023 MCQ

The reaction representing the Mond process for metal refining is _________.

A

$\mathrm{ZnO+C\buildrel \Delta \over \longrightarrow Zn+CO}$

B

$\mathrm{2K[Au(CN)_2]+Zn\buildrel \Delta \over \longrightarrow K_2[Zn(CN)_4]+2Au}$

C

$\mathrm{Zr+2I_2 \buildrel \Delta \over \longrightarrow ZrI_4}$

D

$\mathrm{Ni+4CO\buildrel \Delta \over \longrightarrow Ni(CO)_4}$

Question 20: Palette 20/109

JEE Mains 2023 MCQ

Given below are two statements :

Statement I : In froth floatation method of rotating paddle agitates the mixture to drive air out of it.

Statement II : Iron pyrites and generally avoided for extraction of iron due to environmental reasons.

In the light of the above statements, choose the correct answer from the options given below :

A

Statement I is true but Statement II is false

B

Statement I is false but Statement II is true

C

Both Statement I and Statement II are true

D

Both Statement I and Statement II are false

Question 21: Palette 21/109

JEE Mains 2023 MCQ

Which one of the following reactions does not occur during extraction of copper?

A

$\mathrm{2FeS + 3{O_2} \to 2FeO + 2S{O_2}}$

B

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

C

$\mathrm{CaO + Si{O_2} \to CaSi{O_3}}$

D

$\mathrm{2C{u_2}s + 3{O_2} \to 2C{u_2}O + 2S{O_2}}$

Question 22: Palette 22/109

JEE Mains 2023 MCQ

The metal which is extracted by oxidation and subsequent reduction from its ore is :

A

Al

B

Cu

C

Ag

D

Fe

Question 23: Palette 23/109

JEE Mains 2023 MCQ

Match List I with List II

	List-I		List-II
A.	Reverberatory furnace	I.	Pig Iron
B.	Electrolytic cell	II.	Aluminium
C.	Blast furnace	III.	Silicon
D.	Zone Refining furnace	IV.	Copper

Choose the correct answer from the options given below :

A

A-III, B-IV, C-I, D-II

B

A-IV, B-II, C-I, D-III

C

A-I, B-IV, C-II, D-III

D

A-I, B-III, C-II, D-IV

Question 24: Palette 24/109

JEE Mains 2022 MCQ

In metallurgy the term "gangue" is used for :

A

Contamination of undesired earthy materials.

B

Contamination of metals, other than desired metal.

C

Minerals which are naturally occurring in pure form

D

Magnetic impurities in an ore.

Question 25: Palette 25/109

JEE Mains 2022 MCQ

Which of the reaction is suitable for concentrating ore by leaching process ?

A

$ 2 \mathrm{Cu}_{2} \mathrm{~S}+3 \mathrm{O}_{2} \rightarrow 2 \mathrm{Cu}_{2} \mathrm{O}+2 \mathrm{SO}_{2} $

B

$\mathrm{Fe}_{3} \mathrm{O}_{4}+\mathrm{CO} \rightarrow 3 \mathrm{FeO}+\mathrm{CO}_{2}$

C

$\mathrm{Al}_{2} \mathrm{O}_{3}+2 \mathrm{NaOH}+3 \mathrm{H}_{2} \mathrm{O} \rightarrow 2 \mathrm{Na}\left[\mathrm{Al}(\mathrm{OH})_{4}\right]$

D

$\mathrm{Al}_{2} \mathrm{O}_{3}+6 \mathrm{Mg} \rightarrow 6 \mathrm{MgO}+4 \mathrm{Al}$

Question 26: Palette 26/109

JEE Mains 2022 MCQ

Which of the following methods are not used to refine any metal?

A. Liquation

B. Calcination

C. Electrolysis

D. Leaching

E. Distillation

Choose the correct answer from the options given below:

A

B and D only

B

A, B, D and E only

C

B, D and E only

D

A, C and E only

Question 27: Palette 27/109

JEE Mains 2022 MCQ

The metal that is not extracted from its sulfide ore is :

A

Aluminium

B

Iron

C

Lead

D

Zinc

Question 28: Palette 28/109

JEE Mains 2022 MCQ

Refining using liquation method is the most suitable for metals with :

A

Low melting point

B

High boiling point

C

High electrical conductivity

D

Less tendency to be soluble in melts than impurities

Question 29: Palette 29/109

JEE Mains 2022 MCQ

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.

A

Both Statement I and Statement II are correct.

B

Both Statement I and Statement II are not correct.

C

Statement I is correct but Statement II is not correct.

D

Statement I is not correct but Statement II is correct.

Question 30: Palette 30/109

JEE Mains 2022 MCQ

The compound(s) that is (are) removed as slag during the extraction of copper is :

(A) CaO

(B) FeO

(C) Al₂O₃

(D) ZnO

(E) NiO

Choose the correct answer from the options given below:

A

(C), (D) only

B

(A), (B), (E) only

C

(A), (B) only

D

(B) only

Question 31: Palette 31/109

JEE Mains 2022 MCQ

Match List I with List II.

	List-I Ore		List-II Composition
(A)	Siderite	(I)	FeCO$_3$
(B)	Malachite	(II)	CuCO$_3$ . Cu(OH)$_2$
(C)	Sphalerite	(III)	ZnS
(D)	Calamine	(IV)	ZnCO$_3$

Choose the correct answer from the options given below :

A

A-I, B-II, C-III, D-IV

B

A-III, B-IV, C-II, D-I

C

A-IV, B-III, C-I, D-II

D

A-I, B-II, C-IV, D-III

Question 32: Palette 32/109

JEE Mains 2022 MCQ

In isolation of which one of the following metals from their ores, the use of cyanide salt is not commonly involved?

A

Zinc

B

Gold

C

Silver

D

Copper

Question 33: Palette 33/109

JEE Mains 2022 MCQ

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

FeO + SiO₂ $\to$ FeSiO₃

FeO and FeSiO₃ respectively are.

A

gangue and flux.

B

flux and slag.

C

slag and flux.

D

gangue and slag.

Question 34: Palette 34/109

JEE Mains 2022 MCQ

Given are two statements one is labelled as Assertion A and other is labelled as Reason R.

Assertion A : Magnesium can reduce Al₂O₃ at a temperature below 1350$^\circ$C, while above 1350$^\circ$C, while above 1350$^\circ$C aluminium can reduce MgO.

Reason R : The melting and boiling points of magnesium are lower than those of aluminium.

n light of the above statements, choose most appropriate answer from the options given below :

A

Both A and R are correct, and R is correct explanation of A.

B

Both A and R are correct, but R is NOT the correct explanation of A.

C

A is correct R is not correct.

D

A is not correct, R is correct.

Question 35: Palette 35/109

JEE Mains 2022 MCQ

Statement I : Leaching of gold with cyanide ion in absence of air / O₂ leads to cyano complex of Au(III).

Statement II : Zinc is oxidized during the displacement reaction carried out for gold extraction.

In the light of the above statements, choose the correct answer from the options given below.

A

Both Statement I and Statement II are correct.

B

Both Statement I and Statement II are incorrect.

C

Statement I is correct but Statement II is incorrect.

D

Statement I is incorrect but Statement II is correct.

Question 36: Palette 36/109

JEE Mains 2022 MCQ

Match List-I with List-II

	List - I		List - II
(A)	Concentration of gold ore	(I)	Aniline
(B)	Leaching of alumina	(II)	NaOH
(C)	Froth stabiliser	(III)	SO$_2$
(D)	Blister copper	(IV)	NaCN

Choose the correct answer from the options given below :

A

(A) - (IV), (B) - (III), (C) - (II), (D) - (I)

B

(A) - (IV), (B) - (II), (C) - (I), (D) - (III)

C

(A) - (III), (B) - (II), (C) - (I), (D) - (IV)

D

(A) - (II), (B) - (IV), (C) - (III), (D) - (I)

Question 37: Palette 37/109

JEE Mains 2022 MCQ

Which of the following is structure of a separating funnel?

A

B

C

D

Question 38: Palette 38/109

JEE Mains 2022 MCQ

The role of depressants in 'Froth Flotation method' is to

A

selectively prevent one component of the ore from coming to the froth.

B

reduce the consumption of oil for froth formation.

C

stabilize the froth.

D

enhance non-wettability of the mineral particles.

Question 39: Palette 39/109

JEE Mains 2022 MCQ

Given below are two statements :

Statement I : According to Ellingham diagram, any metal oxide with higher $\Delta$G$^\circ$ is more stable than the one with lower $\Delta$G$^\circ$.

Statement II : The metal involved in the formation of oxide placed lower in the Ellingham diagram can reduce the oxide of a metal placed higher in the diagram.

In the light of the above statements, choose the most appropriate answer from the options given below :

A

Both Statement I and Statement II are correct.

B

Both Statement I and Statement II are incorrect.

C

Statement I is correct but Statement II is incorrect.

D

Statement I is incorrect but Statement II is correct.

Question 40: Palette 40/109

JEE Mains 2022 MCQ

Given below are two statements.

Statement I : During electrolytic refining, blister copper deposits precious metals.

Statement II : In the process of obtaining pure copper by electrolysis method, copper blister is used to make the anode.

In the light of the above statements, choose the correct from the options given below.

A

Both Statement I and Statement II are true.

B

Both Statement I and Statement II are false.

C

Statement I is true but Statement II is false.

D

Statement I is false but Statement II is true.

Question 41: Palette 41/109

JEE Mains 2022 MCQ

Leaching of gold with dilute aqueous solution of NaCN in presence of oxygen gives complex [A], which on reaction with zinc forms the elemental gold and another complex [B]. [A] and [B], respectively are :

A

${[Au{(CN)_4}]^ - }$ and ${[Zn{(CN)_2}{(OH)_2}]^{2 - }}$

B

${[Au{(CN)_2}]^ - }$ and ${[Zn{(OH)_4}]^{2 - }}$

C

${[Au{(CN)_2}]^{ - }}$ and ${[Zn{(CN)_4}]^{2 - }}$

D

${[Au{(CN)_4}]^{2 - }}$ and ${[Zn{(CN)_6}]^{4 - }}$

Question 42: Palette 42/109

JEE Mains 2022 MCQ

Which of the following chemical reactions represents Hall-Heroult Process?

A

Cr₂O₃ + 2Al $\to$ Al₂O₃ + 2Cr

B

2Al₂O₃ + 3C $\to$ 4Al + 3CO₂

C

FeO + CO $\to$ Fe + CO₂

D

2[Au(CN)₂]$_{(aq)}^ - $ + Zn(s) $\to$ 2Au(s) + [Zn(CN₄)]^2$-$

Question 43: Palette 43/109

JEE Mains 2022 MCQ

Match List - I with List - II :

	List - I		List -II
(A)	Sphalerite	(I)	FeCO$_3$
(B)	Calamine	(II)	PbS
(C)	Galena	(III)	ZnCO$_3$
(D)	Siderite	(IV)	ZnS

Choose the most appropriate answer from the options given below :

A

(A)-(IV), (B)-(III), (C)-(II), (D)-(I)

B

(A)-(IV), (B)-(I), (C)-(II), (D)-(III)

C

(A)-(II), (B)-(III), (C)-(I), (D)-(IV)

D

(A)-(III), (B)-(IV), (C)-(II), (D)-(I)

Question 44: Palette 44/109

JEE Mains 2021 MCQ

Calamine and Malachite, respectively, are the ores of :

A

Nickel and Aluminium

B

Zinc and Copper

C

Copper and Iron

D

Aluminium and Zinc

Question 45: Palette 45/109

JEE Mains 2021 MCQ

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : Aluminium is extracted from bauxite by the electrolysis of molten mixture of Al₂O₃ with cryolite.

Reason (R) : The oxidation state of Al in cryolite is +3.

In the light of the above statements, choose the most appropriate answer from the options given below :

A

(A) is true but (R) is false.

B

(A) is false but (R) is true.

C

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

D

Both (A) and (R) are correct but (R) is not the correct explanation of (A)

Question 46: Palette 46/109

JEE Mains 2021 MCQ

Match List-I with List-II :

	List - I (Name of ore/mineral)		List - II (Chemical formula)
(a)	Calmine	(i)	$Zns$
(b)	Malachite	(ii)	$FeC{O_3}$
(c)	Siderite	(iii)	$ZnC{O_3}$
(d)	Sphalerite	(iv)	$CuC{O_3}.Cu{(OH)_2}$

Choose the most appropriate answer from the options given below :

A

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

B

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

C

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

D

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

Question 47: Palette 47/109

JEE Mains 2021 MCQ

Which refining process is generally used in the purification of low melting metals?

A

Chromatographic method

B

Liquation

C

Electrolysis

D

Zone refining

Question 48: Palette 48/109

JEE Mains 2021 MCQ

Given below are two statements :

Statement I : Sphalerite is a sulphide or of zinc and copper glance is a sulphide ore of copper.

Statement II : It is possible to separate two sulphide ores by adjusting proportion of oil to water or by using 'depressants' in a forth flotation method.

Choose the most appropriate answer from the options given below :

A

Statement I is true but Statement II is false.

B

Both Statement I and Statement II are true.

C

Statement I is false but Statement II is true.

D

Both Statement I and Statement II are false.

Question 49: Palette 49/109

JEE Mains 2021 MCQ

Given below are two statements :

Statement I : The choice of reducing agents for metals extraction can be made by using Ellingham diagram, a plot of $\Delta$G vs temperature.

Statement II : The value of $\Delta$S increases from left to right in Ellingham diagram.

In the light of the above statements, choose the most appropriate answer from the options given below :

A

Both Statement I and Statement II are true

B

Statement I is false but Statement II is true

C

Both Statement I and Statement II are false

D

Statement I is true but Statement II is false

Question 50: Palette 50/109

JEE Mains 2021 MCQ

Which one of the following set of elements can be detected using sodium fusion extract?

A

Sulfur, Nitrogen, Phosphorous, Halogens

B

Phosphorous, Oxygen, Nitrogen, Halogens

C

Nitrogen, Phosphorous, Carbon, Sulfur

D

Halogens, Nitrogen, Oxygen, Sulfur

Question 51: Palette 51/109

JEE Mains 2021 MCQ

The addition of silica during the extraction of copper from its sulphide ore :-

A

converts copper sulphide into copper silicate

B

converts iron oxide into iron silicate

C

reduces copper sulphide into metallic copper

D

reduces the melting point of the reaction mixture

Question 52: Palette 52/109

JEE Mains 2021 MCQ

The statement is incorrect about Ellingham diagram is

A

provides idea about the reaction rate.

B

provides idea about free energy change.

C

provides idea about changes in the phases during the reaction.

D

provides idea about reduction of metal oxide.

Question 53: Palette 53/109

JEE Mains 2021 MCQ

Match List I with List II : (Both having metallurgical terms)

	List - I		List - II
(a)	Concentration of Ag ore	(i)	Reverberatory furnace
(b)	Blast furnace	(ii)	Pig iron
(c)	Blister copper	(iii)	Leaching with dilute NaCN solution
(d)	Froth floatation method	(iv)	Sulfide ores

Choose the correct answer from the options given below :

A

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

B

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

C

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

D

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

Question 54: Palette 54/109

JEE Mains 2021 MCQ

In the leaching of alumina from bauxite, the ore expected to leach out in the process by reacting with NaOH is :

A

TiO₂

B

Fe₂O₃

C

ZnO

D

SiO₂

Question 55: Palette 55/109

JEE Mains 2021 MCQ

Sulphide ion is soft base and its ores are common for metals.

(a) Pb (b) Al (c) Ag (d) Mg

A

(a) and (c) only

B

(a) and (d) only

C

(a) and (b) only

D

(c) and (d) only

Question 56: Palette 56/109

JEE Mains 2021 MCQ

Consider two chemical reactions (A) and (B) that take place during metallurgical process:

(A) $ZnC{O_{3(s)}}\buildrel \Delta \over \longrightarrow Zn{O_{(s)}} + C{O_{2(g)}}$

(B) $2Zn{S_{(s)}} + 3{O_{2(g)}}\buildrel \Delta \over \longrightarrow 2Zn{O_{(s)}} + 2S{O_{2(g)}}$

The correct option of names given to them respectively is :

A

(A) is calcination and (B) is roasting

B

Both (A) and (B) are producing same product so both are roasting

C

Both (A) and (B) are producing same product so both are calcination

D

(A) is roasting and (B) is calcination

Question 57: Palette 57/109

JEE Mains 2021 MCQ

The metal that can be purified economically by fractional distillation method is :

A

Fe

B

Zn

C

Cu

D

Ni

Question 58: Palette 58/109

JEE Mains 2021 MCQ

Match List - I with List - II :

	List - I		List - II
(a)	Mercury	(i)	Vapour phase refining
(b)	Copper	(ii)	Distillation refining
(c)	Silicon	(iii)	Electrolytic refining
(d)	Nickel	(iv)	Zone refining

Choose the most appropriate answer from the option given below :

A

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

B

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

C

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

D

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

Question 59: Palette 59/109

JEE Mains 2021 MCQ

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

A

Cryolite

B

Bauxite

C

Calamine

D

Kaolite

Question 60: Palette 60/109

JEE Mains 2021 MCQ

Match List - I with List - II :

	List - I		List - II
(a)	Haematite	(i)	$A{l_2}{O_3}\,.\,x{H_2}O$
(b)	Bauxite	(ii)	$F{e_2}{O_3}$
(c)	Magnetite	(iii)	$CuC{O_3}\,.\,Cu{(OH)_2}$
(d)	Malachite	(iv)	$F{e_3}{O_4}$

Choose the correct answer from the options given below :

A

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

B

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

C

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

D

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

Question 61: Palette 61/109

JEE Mains 2021 MCQ

The point of intersection and sudden increase in the slope, in the diagram given below, respectively, indicates :

A

$\Delta$G > 0 and decomposition of the metal oxide

B

$\Delta$G < 0 and decomposition of the metal oxide

C

$\Delta$G = 0 and reduction of the metal oxide

D

$\Delta$G = 0 and melting or boiling point of the metal oxide

Question 62: Palette 62/109

JEE Mains 2021 MCQ

Which of the following reduction reaction CANNOT be carried out with coke?

A

ZnO $ \to $ Zn

B

Fe₂O₃ $ \to $ Fe

C

Cu₂O $ \to $ Cu

D

Al₂O₃ $ \to $ Al

Question 63: Palette 63/109

JEE Mains 2021 MCQ

The process that involves the removal of sulphur from the ores is :

A

Roasting

B

Smelting

C

Leaching

D

Refining

Question 64: Palette 64/109

JEE Mains 2021 MCQ

Match List - I with List - II.

	List - I		List - II
(a)	Sodium Carbonate	(i)	Deacon
(b)	Titanium	(ii)	Castner-Kellner
(c)	Chlorine	(iii)	van-Arkel
(d)	Sodium hydroxide	(iv)	Solvay

Choose the correct answer from the options given below :

A

(a) $ \to $ (iv), (b) $ \to $ (iii), (c) $ \to $ (i), (d) $ \to $ (ii)

B

(a) $ \to $ (iv), (b) $ \to $ (i), (c) $ \to $ (ii), (d) $ \to $ (iii)

C

(a) $ \to $ (iii), (b) $ \to $ (ii), (c) $ \to $ (i), (d) $ \to $ (iv)

D

(a) $ \to $ (i), (b) $ \to $ (iii), (c) $ \to $ (iv), (d) $ \to $ (ii)

Question 65: Palette 65/109

JEE Mains 2021 MCQ

Match List - I with List - II.

	List - I		List - II
(a)	Siderite	(i)	Cu
(b)	Calamine	(ii)	Ca
(c)	Malachite	(iii)	Fe
(d)	Cryolite	(iv)	Al
		(v)	Zn

Choose the correct answer from the options given below :

A

(a) $ \to $ (i), (b) $ \to $ (ii), (c) $ \to $ (iii), (d) $ \to $ (iv)

B

(a) $ \to $ (iii), (b) $ \to $ (i), (c) $ \to $ (v), (d) $ \to $ (ii)

C

(a) $ \to $ (i), (b) $ \to $ (ii), (c) $ \to $ (v), (d) $ \to $ (iii)

D

(a) $ \to $ (iii), (b) $ \to $ (v), (c) $ \to $ (i), (d) $ \to $ (iv)

Question 66: Palette 66/109

JEE Mains 2021 MCQ

Calgon is used for water treatment. Which of the following statement is NOT true about Calgon?

A

It is also known as Graham's salt.

B

It is polymeric compound and is water soluble.

C

It does not remove Ca²⁺ ion by precipitation.

D

Calgon contains the 2^nd most abundant element by weight in the Earth's crust.

Question 67: Palette 67/109

JEE Mains 2021 MCQ

Match List - I with List - II.

	List - I (Ore)		List - II (Element Present)
(a)	Kernite	(i)	Tin
(b)	Cassiterite	(ii)	Boron
(c)	Calamine	(iii)	Fluorine
(d)	Cryolite	(iv)	Zinc

Choose the most appropriate answer from the options given below :

A

(a) $ \to $ (i), (b) $ \to $ (iii), (c) $ \to $ (iv), (d) $ \to $ (ii)

B

(a) $ \to $ (iii), (b) $ \to $ (i), (c) $ \to $ (ii), (d) $ \to $ (iv)

C

(a) $ \to $ (ii), (b) $ \to $ (i), (c) $ \to $ (iv), (d) $ \to $ (iii)

D

(a) $ \to $ (ii), (b) $ \to $ (iv), (c) $ \to $ (i), (d) $ \to $ (iii)

Question 68: Palette 68/109

JEE Mains 2021 MCQ

The major components of German Silver are :

A

Zn, Ni and Ag

B

Cu, Zn and Ni

C

Cu, Zn and Ag

D

Ge, Cu and Ag

Question 69: Palette 69/109

JEE Mains 2021 MCQ

The method used for the purification of Indium is :

A

zone refining

B

vapour phase refining

C

liquation

D

van Arkel method

Question 70: Palette 70/109

JEE Mains 2021 MCQ

Ellingham diagram is a graphical representation of :

A

$\Delta$G vs P

B

$\Delta$G vs T

C

($\Delta$G $-$ T$\Delta$S) vs T

D

$\Delta$H vs T

Question 71: Palette 71/109

JEE Mains 2021 MCQ

Math List - I with List - II.

	List I (Metal)		List II (Ores)
(a)	Aluminium	(i)	Siderite
(b)	Iron	(ii)	Calamine
(c)	Copper	(iii)	Kaolinite
(d)	Zinc	(iv)	Malachite

Choose the correct answer from the options given below :

A

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

B

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

C

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

D

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

Question 72: Palette 72/109

JEE Mains 2021 MCQ

The major components in "Gun Metal” are :

A

Al, Cu, Mg and Mn

B

Cu, Ni and Fe

C

Cu, Sn and Zn

D

Cu, Zn and Ni

Question 73: Palette 73/109

JEE Mains 2021 MCQ

Which of the following ore is concentrated using group 1 cyanide salt ?

A

Sphalerite

B

Malachite

C

Siderite

D

Calamine

Question 74: Palette 74/109

JEE Mains 2020 MCQ

The element that can be refined by distillation is :

A

gallium

B

nickel

C

zinc

D

tin

Question 75: Palette 75/109

JEE Mains 2020 MCQ

The incorrect statement is :

A

bronze is an alloy of copper and tin

B

cast iron is used to manufacture wrought iron

C

german silver is an alloy of zinc, copper and nickel

D

brass is an alloy of copper and nickel

Question 76: Palette 76/109

JEE Mains 2020 MCQ

An Ellingham diagram provides information about :

A

the temperature dependence of the standard Gibbs energies of formation of some metal oxides

B

the pressure dependence of the standard electrode potentials of reduction reactions involved in the extraction of metals

C

the conditions of pH and potential under which a species is thermodynamically stable

D

the kinetics of the reduction process

Question 77: Palette 77/109

JEE Mains 2020 MCQ

Among statements (a) - (d), the correct ones are
(a) Lime stone is decomposed to CaO during the extraction of iron from its oxides.
(b) In the extraction of silver, silver is extracted as an anionic complex.
(c) Nickel is purified by Mond’s process.
(d) Zr and Ti are purified by Van Arkel method.

A

(a), (c) and (d) only

B

(c) and (d) only

C

(b), (c) and (d) only

D

(a), (b), (c) and (d)

Question 78: Palette 78/109

JEE Mains 2020 MCQ

Cast iron is used for the manufacture of :

A

wrought iron, pig iron and steel

B

wrought iron and pig iron

C

wrought iron and steel

D

pig iron, scrap iron and steel

Question 79: Palette 79/109

JEE Mains 2020 MCQ

According to the following diagram, A reduces BO₂ when the temperature is :

A

> 1400 °C

B

> 1200 °C but < 1400 °C

C

< 1400 °C

D

< 1200 °C

Question 80: Palette 80/109

JEE Mains 2020 MCQ

Among the reactions (a) - (d), the reaction(s) that does/do not occur in the blast furnace during the extraction of iron is/are :
(a) CaO + SiO₂ $ \to $ CaSiO₃
(b) 3Fe₂O₃ + CO $ \to $ 2Fe₃O₄ + CO₂
(c) FeO + SiO₂ $ \to $ FeSiO₃
(d) FeO $ \to $ Fe + ${{1 \over 2}}$O₂

A

(a) and (d)

B

(c) and (d)

C

(a)

D

(d)

Question 81: Palette 81/109

JEE Mains 2020 MCQ

The refining method used when the metal and the impurities have low and high melting temperatures, respectively, is :

A

liquation

B

vapour phase refining

C

distillation

D

zone refining

Question 82: Palette 82/109

JEE Mains 2020 MCQ

The purest from of commercial iron is :

A

pig iron

B

wrought iron

C

cast iron

D

scrap iron and pig iron

Question 83: Palette 83/109

JEE Mains 2019 MCQ

The correct statement is :

A

leaching of bauxite using concentrated NaOH solution gives sodium aluminate and sodium silicate

B

the Hall-Heroult process is used for the production of aluminium and iron

C

pig iron is obtained from cast iron

D

the blistered appearance of copper during the metallurgical process is due to the evolution of CO₂

Question 84: Palette 84/109

JEE Mains 2019 MCQ

The idea of froth floatation method came from a person X and this method is related to the process Y of ores. X and Y, respectively, are :

A

washer woman and concentration

B

fisher woman and concentration

C

wisher man and reduction

D

fisher man and reduction

Question 85: Palette 85/109

JEE Mains 2019 MCQ

The correct statement is :

A

zincite is a carbonate ore.

B

Sodium cyanide cannot be used in the metallurgy of silver.

C

aniline is a froth stabilizer.

D

zone refining process is used for the refining of titanium.

Question 86: Palette 86/109

JEE Mains 2019 MCQ

Match the refining methods (Column I) with metals (Column II).

Column I (Refining Methods)	Column II (Metals)
(I) Liquation	(a) Zr
(II) Zone Refining	(b) Ni
(III) Mond Process	(c) Sn
(IV) Van Arkel Method	(d) Ga

A

(I)-(c) ; (II)-(a) ; (III)-(b) ; (IV)-(d)

B

(I)-(c) ; (II)-(d) ; (III)-(b) ; (IV)-(a)

C

(I)-(b) ; (II)-(d) ; (III)-(a) ; (IV)-(c)

D

(I)-(b) ; (II)-(c) ; (III)-(d) ; (IV)-(a)

Question 87: Palette 87/109

JEE Mains 2019 MCQ

Assertion: For the extraction of iron, haematite ore is used.

Reason: Haematite is a carbonate ore of iron.

A

Both the assertion and reason are correct and the reason is the correct explanation for the assertion.

B

Only the reason is correct.

C

Both the assertion and reason are correct, but the reason is not the correct explanation for the assertion.

D

Only the assertion is correct.

Question 88: Palette 88/109

JEE Mains 2019 MCQ

The one that is not a carbonate ore is :

A

siderite

B

bauxite

C

malachite

D

calamine

Question 89: Palette 89/109

JEE Mains 2019 MCQ

The ore that contains the metal in the form of fluoride is :

A

sphalerite

B

magnetite

C

malachite

D

cryolite

Question 90: Palette 90/109

JEE Mains 2019 MCQ

The Mond process is used for the

A

Extraction of Zn

B

extraction of Mo

C

Purification of Zr and Ti

D

Purification of Ni

Question 91: Palette 91/109

JEE Mains 2019 MCQ

With respect to an ore, Ellingham diagram helps to predict the feasibility of its.

A

Electrolysis

B

Thermal reducation

C

Vapour phase refining

D

Zone refining

Question 92: Palette 92/109

JEE Mains 2019 MCQ

The pair that does NOT require calcination is -

A

Fe₂O₃ and CaCO₃⋅MgCO₃

B

ZnCO₃ and CaO

C

ZnO and Fe₂O₃⋅xH₂O

D

ZnO and MgO

Question 93: Palette 93/109

JEE Mains 2019 MCQ

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

A

Copper

B

Platinum

C

Carbon

D

Pure aluminium

Question 94: Palette 94/109

JEE Mains 2019 MCQ

Match the ores (column A) with the metals (column B) :

(Column A) ores		(Column B) Metals
(I)	Siderite	(a)	Zinc
(II)	Kaolinite	(b)	Copper
(III)	Malachite	(c)	Iron
(IV)	Calamine	(d)	Aluminium

A

(I)-(c); (II)-(d); (III)-(b); (IV)-(a)

B

(I)-(a); (II)-(b); (III)-(c); (IV)-(d)

C

(I)-(b); (II)-(c); (III)-(d); (IV)-(a)

D

(I)-(c); (II)-(d); (III)-(a); (IV)-(b)

Question 95: Palette 95/109

JEE Mains 2019 MCQ

The electrolytes usually used in the electroplating of gold and silver, respectively are :

A

[Au(CN)₂]^– and [Ag(CN)₂]^–

B

[Au(CN)₂]^– and [Ag(Cl)₂]^–

C

[Au(OH)₄]^– and [Ag(OH)₂]^–

D

[Au(NH₃)₂]^– and [Ag(CN)₂]^–

Question 96: Palette 96/109

JEE Mains 2019 MCQ

Hall- Heroult's process is given by :

A

Cu²⁺ (aq) + H₂(g) $ \to $ Cu(s) + 2H⁺ (aq)

B

Cr₂O₃ + 2AI  $ \to $ Al₂O₃ + 2Cr

C

2Al₂O₃ + 3C  $ \to $ 4Al + 3CO₂

D

ZnO + C   $\buildrel {Coke,\,1673\,K} \over \longrightarrow $ Zn + CO

Question 97: Palette 97/109

JEE Mains 2019 MCQ

The correct statement regarding the given Ellingham diagram is :

A

At 1400^oC, Al can be used for the extraction of Zn from ZnO

B

At 500^oC, coke can be used for the extraction of Zn from ZnO

C

Coke cannot be used for the extraction of Cu from Cu₂O.

D

At 800^oC, Cu can be used for the extraction of Zn from ZnO.

Question 98: Palette 98/109

JEE Mains 2019 MCQ

The ore that contains both iron and copper is :

A

Copper Pyrites

B

Malachite

C

Dolomite

D

Azurite

Question 99: Palette 99/109

JEE Mains 2018 MCQ

In the extraction of copper from its sulphate ore, metal is finally obtained by the oxidation of cuprous sulphide with :

A

Fe₂O₃

B

Cu₂O

C

SO₂

D

CO

Question 100: Palette 100/109

JEE Mains 2018 MCQ

In the leaching method, bauxite ore is digested with a concentrated solution of NaOH that produces 'X'. When CO₂ gas is passed through the aqueous solution of 'X', a hydrated compound 'Y' is precipitated. 'X' and 'Y' respectively are :

A

NaAlO₂   and   Al₂(CO₃)₃.x H₂O

B

A(OH)₃   and   Al₂O₃.x H₂O

C

Na[Al(OH)₄]   and   Al₂O₃.x H₂O

D

Na[Al(OH)₄]   and   Al₂(CO₃)₃.x H₂O

Question 101: Palette 101/109

JEE Mains 2016 MCQ

Extraction of copper by smelting uses silica as an additive to remove :

A

Cu₂S

B

FeO

C

FeS

D

Cu₂O

Question 102: Palette 102/109

JEE Mains 2016 MCQ

Which one of the following ores is best concentrated by froth floatation method?

A

Siderite

B

Galena

C

Malachite

D

Magnetite

Question 103: Palette 103/109

JEE Mains 2015 MCQ

In the context of the Hall-Heroult process for the extraction of Al, which of the following statements is false?

A

Al₂O₃ is mixed with CaF₂ which lowers the melting point of the mixture and brings conductivity

B

Al³⁺ is reduced at the cathode to form Al

C

Na₃AlF₆ serves as the electrolyte

D

CO and CO₂ are produced in this process

Question 104: Palette 104/109

JEE Mains 2012 MCQ

Which method of purification is represented by the following equation :
Ti (s) + 2I₂ (g) $\buildrel {523K} \over \longrightarrow $ TiI₄ (g) $\buildrel {1700K} \over \longrightarrow $ Ti (s) + 2I₂ (g)

A

zone refining

B

cupellation

C

Poling

D

Van Arkel

Question 105: Palette 105/109

JEE Mains 2008 MCQ

Which of the following factors is of no significance for roasting sulphide ores to the oxides and not subjecting the sulphide ores to carbon reduction directly?

A

Metal sulphides are thermodynamically more stable than CS₂

B

CO₂ is thermodynamically more stable than CS₂

C

Metal sulphides are less stable than the corresponding oxides

D

CO₂ is more volatile than CS₂

Question 106: Palette 106/109

JEE Mains 2005 MCQ

During the process of electrolytic refining of copper, some metals present as impurity settle as ‘anode mud’ These are

A

Sn and Ag

B

Pb and Zn

C

Ag and Au

D

Fe and Ni

Question 107: Palette 107/109

JEE Mains 2004 MCQ

Which one of the following ores is best concentrated by froth – floatation method?

A

Magnetite

B

Malachite

C

Galena

D

Cassiterite

Question 108: Palette 108/109

JEE Mains 2002 MCQ

The metal extracted by leaching with a cyanide is

A

Mg

B

Ag

C

Cu

D

Na

Question 109: Palette 109/109

JEE Mains 2002 MCQ

Aluminium is extracted by the electrolysis of

A

bauxite

B

alumina

C

alumina mixed with molten cryolite

D

molten cryolite