How many questions from Isolation of Metals appear in JEE?

Isolation of Metals has appeared in 106 of the last 186 JEE Main and JEE Advanced papers — about 57% of them — contributing 112 questions in total across those papers.

Is Isolation of Metals an important chapter for JEE?

Judged by how often it is actually tested, it appears in roughly 57% of papers. Chapters above about 50% are effectively guaranteed to show up every session, so they repay thorough preparation; lower-frequency chapters are better treated as targeted revision.

Where do these Isolation of Metals questions come from?

Every question is from an official JEE Main or JEE Advanced paper, transcribed from the original paper and tagged to this chapter. Answers follow the official answer key.

Isolation of Metals JEE Previous Year Questions with Answers

Q1·ChemistrySingle correctJEE Main 2025

Match List-I (Alloy) with List-II (Constituent Metals). Choose the correct answer from the options given below:

List-I (Alloy)	List-II (Constituent Metals)
A.Bronze	I.Cu, Ni
B.Brass	II.Fe, Cr, Ni, C
C.UK silver coin	III.Cu, Zn
D.Stainless Steel	IV.Cu, Sn

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

Q2·ChemistrySingle correctJEE Main 2024

Identify the incorrect pair from the following :

(A)Fluorspar - $BF_3$
(B)Cryolite - $Na_3AlF_6$
(C)Fluoroapatite - $3Ca_3(PO_4)_2\cdot CaF_2$
(D)Carnallite - $KCl\cdot MgCl_2\cdot 6H_2O$

Q3·ChemistryMultiple correctJEE Advanced 2023

The correct statement(s) related to processes involved in the extraction of metals is (are)

(A)Roasting of Malachite produces Cuprite.
(B)Calcination of Calamine produces Zincite.
(C)Copper pyrites is heated with silica in a reverberatory furnace to remove iron.
(D)Impure silver is treated with aqueous KCN in the presence of oxygen followed by reduction with zinc metal.

Q4·ChemistrySingle correctJEE Main 2023

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

(A) $Fe_2O_3 \cdot xH_2O \xrightarrow{\Delta} Fe_2O_3 + xH_2O$
(B) $CaCO_3 \xrightarrow{\Delta} CaO + CO_2$
(C) $CaCO_3 \cdot MgCO_3 \xrightarrow{\Delta} CaO + MgO + 2CO_2$
(D) $2PbS + 3O_2 \xrightarrow{\Delta} 2PbO + 2SO_2$

Q5·ChemistrySingle correctJEE Main 2023

Which one of the following is most likely a mismatch?

(A)Zinc - Liquation
(B)Titanium - van Arkel method
(C)Nickel - Mond process
(D)Copper - Electrolysis

Q6·ChemistrySingle correctJEE Main 2023

Given below are two statements related to Ellingham diagram. Statement-I: Ellingham diagrams can be constructed for formation of oxides, sulphides and halides of metals. Statement-II: It consists of plots of

\Delta H^0

vs 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)Statement I is incorrect but Statement II is correct
(C)Both Statement I and Statement II are incorrect
(D)Statement I is correct but Statement II is incorrect

Q7·ChemistrySingle correctJEE Main 2023

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

Mg\rightarrow MgO

at

\sim1120°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 A and R are true but R is NOT the correct explanation of A
(B)Both A and R are true and R is the correct explanation of A
(C)A is false but R is true
(D)A is true but R is false

Q8·ChemistrySingle correctJEE Main 2023

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)Statement I is correct but Statement II is incorrect
(C)Both Statement I and Statement II are incorrect
(D)Statement I is incorrect but Statement II is correct

Q9·ChemistrySingle correctJEE Main 2023

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

2Cu_2S + 3O_2 \rightarrow 2Cu_2O + 2SO_2

(ii)

2Cu_2O + Cu_2S \rightarrow 6Cu + SO_2

is called

(A)Blister copper
(B)Copper scrap
(C)Reduced copper
(D)Copper matte

Q10·ChemistrySingle correctJEE Main 2023

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

(A)Pine oils
(B)Xanthates
(C)Fatty acids
(D)Cresols

Q11·ChemistrySingle correctJEE Main 2023

A Gibbs energy (

\Delta G^\circ

) vs T plot for the formation of oxides is given in the figure. For the given diagram, the correct statement is:

(A)At 600 $^\circ$ C, C can reduce ZnO
(B)At 600 $^\circ$ C, C can reduce FeO
(C)At 600 $^\circ$ C, CO cannot reduce FeO
(D)At 600 $^\circ$ C, CO can reduce ZnO

Q12·ChemistrySingle correctJEE Main 2023

In the Hall-Heroult process, the following is used for reducing

Al_2O_3

:

(A)Graphite
(B)Magnesium
(C) $Na_3AlF_6$
(D) $CaF_2$

Q13·ChemistrySingle correctJEE Main 2023

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

(A)Cu
(B)Sn
(C)Pb
(D)Au

Q14·ChemistrySingle correctJEE Main 2023

Which of the following options are correct for the reaction

2[Au(CN)_2]^{-}(aq)+Zn(s)\to 2Au(s)+[Zn(CN)_4]^{2-}(aq)

? A. Redox reaction B. Displacement reaction C. Decomposition reaction D. Combination reaction Choose the correct answer from the options given below:

(A)A and B only
(B)A only
(C)C and D only
(D)A and D only

Q15·ChemistryNumericalJEE Main 2023

Among following compounds, the number of those present in copper matte is _________. A.

CuCO_3

B.

Cu_2S

C.

Cu_2O

D. FeO

Q16·ChemistryAssertion & ReasonJEE Main 2023

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)Both A and R are correct but R is NOT the correct explanation of A
(B)Both A and R are correct and R is the correct explanation of A
(C)A is not correct but R is correct
(D)A is correct but R is not correct

Q17·ChemistrySingle correctJEE Main 2023

Which one of the following statements is incorrect?

(A)van Arkel method is used to purify tungsten.
(B)The malleable iron is prepared from cast iron by oxidising impurities in a reverberatory furnace.
(C)Cast iron is obtained by melting pig iron with scrap iron and coke using hot air blast.
(D)Boron and Indium can be purified by zone refining method.

Q18·ChemistrySingle correctJEE Main 2023

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)C, D and E only
(B)B, D and C only
(C)A and C only
(D)B, D and E only

Q19·ChemistrySingle correctJEE Main 2023

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

Al_2O_3

is mixed with

Na_3AlF_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 I is correct but Statement II is incorrect
(B)Both Statement I and Statement II are incorrect
(C)Both Statement I and Statement II are correct
(D)Statement I is incorrect but Statement II is correct

Q20·ChemistrySingle correctJEE Main 2023

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

(A)remove FeO as FeSiO $_3$
(B)decrease the temperature needed for roasting of Cu $_2$ S
(C)separate CuO as CuSiO $_3$
(D)remove calcium as CaSiO $_3$

Q21·ChemistrySingle correctJEE Main 2023

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

(A)Siderite
(B)Sphalerite
(C)Malachite
(D)Calamine

Q22·ChemistrySingle correctJEE Main 2023

The reaction representing the Mond process for metal refining is:

(A)ZnO + C $\xrightarrow{\Delta}$ Zn + CO
(B)Zr + 2I $_2$ $\xrightarrow{\Delta}$ ZrI $_4$
(C)2K[Au(CN) $_2$ ] + Zn $\xrightarrow{\Delta}$ K $_2$ [Zn(CN) $_4$ ] + 2Au
(D)Ni + 4CO $\xrightarrow{\Delta}$ Ni(CO) $_4$

Q23·ChemistrySingle correctJEE Main 2023

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

(A) $2Cu_2S + 3O_2 \rightarrow 2Cu_2O + 2SO_2$
(B) $FeO + SiO_2 \rightarrow FeSiO_3$
(C) $2FeS + 3O_2 \rightarrow 2FeO + 2SO_2$
(D) $CaO + SiO_2 \rightarrow CaSiO_3$

Q24·ChemistrySingle correctJEE Main 2023

Given below are two statements: Statement I : In froth floatation method a rotating paddle agitates the mixture to drive air out of it. Statement II : Iron pyrites are 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 false but Statement II is true
(B)Both Statement I and Statement II are false
(C)Statement I is true but Statement II is false
(D)Both Statement I and Statement II are true

Q25·ChemistrySingle correctJEE Main 2023

Match List I (metallurgical furnace / process) with List II (the metal or element produced). Choose the correct answer from the options given below:

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

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

Q26·ChemistrySingle correctJEE Main 2023

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

(A)Ag
(B)Fe
(C)Cu
(D)Al

Q27·ChemistryMultiple correctJEE Advanced 2022

The electrochemical extraction of aluminum from bauxite ore involves

(A)the reaction of $\mathrm{Al_2O_3}$ with coke (C) at a temperature $> 2500\ ^\circ\mathrm{C}$ .
(B)the neutralization of aluminate solution by passing $\mathrm{CO_2}$ gas to precipitate hydrated alumina ( $\mathrm{Al_2O_3 \cdot 3H_2O}$ ).
(C)the dissolution of $\mathrm{Al_2O_3}$ in hot aqueous NaOH.
(D)the electrolysis of $\mathrm{Al_2O_3}$ mixed with $\mathrm{Na_3AlF_6}$ to give Al and $\mathrm{CO_2}$ .

Q28·ChemistryMultiple correctJEE Advanced 2022

The correct option(s) related to the extraction of iron from its ore in the blast furnace operating in the temperature range 900 – 1500 K is(are)

(A)Limestone is used to remove silicate impurity.
(B)Pig iron obtained from blast furnace contains about 4% carbon.
(C)Coke (C) converts $\mathrm{CO_2}$ to CO.
(D)Exhaust gases consist of $\mathrm{NO_2}$ and CO.

Q29·ChemistrySingle correctJEE Main 2022

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 occuring in pure form
(D)Magnetic impurities in an ore.

Q30·ChemistrySingle correctJEE Main 2022

In liquation process used for tin (Sn), the metal :

(A)is reacted with acid
(B)is dissolved in water
(C)is brought to molten form which is made to flow on a slope
(D)is fused with NaOH.

Q31·ChemistrySingle correctJEE Main 2022

Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R Assertion A : The reduction of a metal oxide is easier if the metal formed is in liquid state than solid state. Reason R : The value of

\Delta \mathrm{G}^{\ominus}

becomes more on negative side as entropy is higher in liquid state than solid state. In the light of the above statements. Choose the most appropriate answer from the options given below

(A)Both A and R are correct and R is the correct explanation of A
(B)Both A and R are correct but R is NOT the correct explanation of A
(C)A is correct but R is not correct
(D)A is not correct but R is correct

Q32·ChemistrySingle correctJEE Main 2022

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

(A)2Cu $_2$ S + 3O $_2$ → 2Cu $_2$ O + 2SO $_2$
(B)Fe $_3$ O $_4$ + CO → 3FeO + CO $_2$
(C)Al $_2$ O $_3$ + 2NaOH + 3H $_2$ O → 2Na[Al(OH) $_4$ ]
(D)Al $_2$ O $_3$ + 6Mg → 6MgO + 4Al

Q33·ChemistryNumericalJEE Main 2022

Among the following ores Bauxite, Siderite, Cuprite, Calamine, Haematite, Kaolinite, Malachite, Magnetite, Sphalerite, Limonite, Cryolite, the number of principal ores if (of) iron is________.

Q34·ChemistrySingle correctJEE Main 2022

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

Q35·ChemistrySingle correctJEE Main 2022

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

(A)Aluminium
(B)Iron
(C)Lead
(D)Zinc

Q36·ChemistrySingle correctJEE Main 2022

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

Q37·ChemistrySingle correctJEE Main 2022

The compound(s) that is(are) removed as slag during the extraction of copper is : (1) CaO (2) FeO (3)

Al_{2}O_{3}

(4) ZnO (5) NiO Choose the correct answer from the options given below :

(A)(3) (4) Only
(B)(1), (2), (5) Only
(C)(1), (2) Only
(D)(2) Only

Q38·ChemistrySingle correctJEE Main 2022

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

Q39·ChemistrySingle correctJEE Main 2022

Match List I with List II. List I Ore A. Siderite B. Malachite C. Sphalerite D. Calamine List II Composition I. Fe CO

_3

II. CuCO

_3

.Cu(OH)

_2

III. ZnS 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

Q40·ChemistrySingle correctJEE Main 2022

Given are two statements one is labelled as Assertion A and other is labelled as Reason R. Assertion A :Magnesium can reduce

Al_2O_3

at a temperature below 1350°C, while above 1350°C aluminium can reduce MgO. Reason R : The melting and boiling points of magnesium are lower than those of aluminium. In 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.

Q41·ChemistrySingle correctJEE Main 2022

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

_2

→ FeSiO

_3

FeO and FeSiO

_3

respectively are.

(A)gangue and flux
(B)flux and slag
(C)slag and flux
(D)gangue and slag

Q42·ChemistrySingle correctJEE Main 2022

Statement I : Leaching of gold with cyanide ion in absence of air / O

_2

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

Q43·ChemistrySingle correctJEE Main 2022

Match List-I with List-II List-I (A) Concentration of gold ore (B) Leaching of alumina (C) Froth stabiliser (D) Blister copper List-II (I) Aniline (II) NaOH (III)

SO_{2}

(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)

Q44·ChemistrySingle correctJEE Main 2022

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.

Q45·ChemistrySingle correctJEE Main 2022

Given below are two statements : Statement I : According to the Ellingham diagram, any metal oxide with higher ΔG° is more stable than the one with lower ΔG°. 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.

Q46·ChemistrySingle correctJEE Main 2022

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 answer 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.

Q47·ChemistrySingle correctJEE Main 2022

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 $[Zn(CN)_6]^{4-}$

Q48·ChemistrySingle correctJEE Main 2022

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

(A)Cr $_2$ O $_3$ + 2Al $\rightarrow$ Al $_2$ O $_3$ + 2Cr
(B)2Al $_2$ O $_3$ + 3C $\rightarrow$ 4Al + 3CO $_2$
(C)FeO + CO $\rightarrow$ Fe + CO $_2$
(D)2[Au(CN) $_2$ ] $^{-}_{(aq)}$ + Zn(s) $\rightarrow$ 2Au(s) + [Zn(CN) $_4$ ] $^{2-}$

Q49·ChemistryNumericalJEE Main 2022

(a) Baryte, (b) Galena, (c) Zinc blende and (d) Copper pyrites. How many of these minerals are sulphide based?

Q50·ChemistrySingle correctJEE Main 2022

Match List – I with List – II Choose the most appropriate answer from the options given below:

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

(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)

Q51·ChemistryMultiple correctJEE Advanced 2021

The correct statement(s) related to the metal extraction processes is(are)

(A)A mixture of PbS and PbO undergoes self-reduction to produce Pb and $\mathrm{SO_2}$ .
(B)In the extraction process of copper from copper pyrites, silica is added to produce copper silicate.
(C)Partial oxidation of sulphide ore of copper by roasting, followed by self-reduction produces blister copper.
(D)In cyanide process, zinc powder is utilized to precipitate gold from $\mathrm{Na[Au(CN)_2]}$

Q52·ChemistrySingle correctJEE Main 2021

Calamine and Malachite, respectively, are the ores of :

(A)Nickel and Aluminium
(B)Zinc and Copper
(C)Copper and Iron
(D)Aluminium and Zinc

Q53·ChemistryNumericalJEE Main 2021

In the electrolytic refining of blister copper, the total number of main impurities, from the following, removed as anode mud is ________ Pb, Sb, Se, Te, Ru, Ag, Au and Pt

Q54·ChemistrySingle correctJEE Main 2021

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

\mathrm{Al_2O_3}

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)

Q55·ChemistrySingle correctJEE Main 2021

Match List-I (Name of ore/mineral) with List – II (Chemical formula) : Choose the most appropriate answer from the options given below :

List-I (Name of ore/mineral)	List-II (Chemical formula)
a.Calamine	i.Zns
b.Malachite	ii.FeCO $_{3}$
c.Siderite	iii.ZnCO $_{3}$
d.Sphalerite	iv.CuCO $_{3}$ · Cu(OH) $_{2}$

(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)

Q56·ChemistrySingle correctJEE Main 2021

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

(A)Chromatographic method
(B)Liquation
(C)Electrolysis
(D)Zone refining

Q57·ChemistrySingle correctJEE Main 2021

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

Q58·ChemistrySingle correctJEE Main 2021

Given below are two statements : Statement I : Sphalerite is a sulphide ore 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 froth 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.

Q59·ChemistrySingle correctJEE Main 2021

The statement that is INCORRECT about Ellingham diagram is:

(A)Provides idea about the reaction rate.
(B)provides idea about changes in the phases during the reaction
(C)provides idea about free energy change.
(D)provides idea about reduction of metal oxide.

Q60·ChemistrySingle correctJEE Main 2021

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

(A)reduces copper sulphide into metallic copper
(B)reduces the melting point of the reaction mixture
(C)converts copper sulphide into copper silicate
(D)converts iron oxide into iron silicate

Q61·ChemistrySingle correctJEE Main 2021

Match List – I with List – II: Choose the correct answer from the options given below:

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

(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)

Q62·ChemistrySingle correctJEE Main 2021

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

(A)ZnO
(B) $Fe_2O_3$
(C) $SiO_2$
(D) $TiO_2$

Q63·ChemistrySingle correctJEE Main 2021

Sulphide ion is soft base and its ores are common for metals. (a) Pb (b) Al (c) Ag (d) Mg Choose the correct answer from the options given below :

(A)(c) and (d) only
(B)(a) and (c) only
(C)(a) and (d) only
(D)(a) and (b) only

Q64·ChemistrySingle correctJEE Main 2021

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

\mathrm{ZnCO_{3(s)} \xrightarrow{\Delta} ZnO_{(s)} + CO_{2(g)}}

(b)

\mathrm{2ZnS_{(s)} + 3O_{2(g)} \xrightarrow{\Delta} 2ZnO_{(s)} + 2SO_{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 calcination
(C)Both (a) and (b) are producing same product so both are roasting
(D)(a) is roasting and (b) is calcination

Q65·ChemistrySingle correctJEE Main 2021

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

(A)Ni
(B)Cu
(C)Fe
(D)Zn

Q66·ChemistrySingle correctJEE Main 2021

Match list-I (metal) with list-II (refining process) : Choose the most appropriate answer from the option given below :

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

(A)a-i, b-iv, c-ii, d-iii
(B)a-ii, b-iii, c-i, d-iv
(C)a-ii, b-iii, c-iv, d-i
(D)a-ii, b-iv, c-iii, d-i

Q67·ChemistrySingle correctJEE Main 2021

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

Q68·ChemistrySingle correctJEE Main 2021

Match List-I and List-II : Choose the correct answer from the options given below :

List-I	List-II
a.Haematite	i.Al $_{2}$ O $_{3}$ .xH $_{2}$ O
b.Bauxite	ii.Fe $_{2}$ O $_{3}$
c.Magnetite	iii.CuCO $_{3}$ .Cu(OH) $_{2}$
d.Malachite	iv.Fe $_{3}$ O $_{4}$

(A)(a)-(ii), (b)-(iii), (c)-(i), (d)-(iv)
(B)(a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
(C)(a)-(i), (b)-(iii), (c)-(ii), (d)-(iv)
(D)(a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)

Q69·ChemistrySingle correctJEE Main 2021

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

(A)Al $_{2}$ O $_{3}$ → Al
(B)ZnO → Zn
(C)Fe $_{2}$ O $_{3}$ → Fe
(D)Cu $_{2}$ O → Cu

Q70·ChemistrySingle correctJEE Main 2021

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

(A)Smelting
(B)Roasting
(C)Leaching
(D)Refining

Q71·ChemistrySingle correctJEE Main 2021

Match List-I with List-II List-I (a) Siderite (b) Calamine (c) Malachite (d) Cryolite List-II (i) Cu (ii) Ca (iii) Fe (iv) Al (v) Zn Choose the correct answer from the options given below:

(A)(a)-(i), (b)-(ii), (c)-(v), (d)-(iii)
(B)(a)-(iii), (b)-(v), (c)-(i), (d)-(iv)
(C)(a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)
(D)(a)-(iii), (b)-(i), (c)-(v), (d)-(ii)

Q72·ChemistrySingle correctJEE Main 2021

Match List-I with List-II. List –I (Ore) (a) Kernite (b) Cassiterite (c) Calamine (d) Cryolite List-II (Element Present) (i) Tin (ii) Boron (iii) Fluorine (iv) Zinc Choose the most appropriate answer from the option given below :

(A)(a) – (ii), (b) – (iv), (c) – (i), (d) – (iii)
(B)(a) – (ii), (b) – (i), (c) – (iv), (d) – (iii)
(C)(a) – (i), (b) – (iii), (c) – (iv), (d) – (ii)
(D)(a) – (iii), (b) – (i), (c) – (ii), (d) – (iv)

Q73·ChemistrySingle correctJEE Main 2021

The method used for the purification of Indium is :

(A)van Arkel method
(B)vapour phase refining
(C)zone refining
(D)Liquation

Q74·ChemistrySingle correctJEE Main 2021

Ellingham diagram is a graphical representation of:

(A)ΔG vs T
(B)(ΔG − TΔS) vs T
(C)ΔH vs T
(D)ΔG vs P

Q75·ChemistrySingle correctJEE Main 2021

The major components in “Gun Metal” are:

(A)Al, Cu, Mg and Mn
(B)Cu, Sn and Zn
(C)Cu, Zn and Ni
(D)Cu, Ni and Fe

Q76·ChemistrySingle correctJEE Main 2021

Match List-I with List-II List- I List-II (Metal) (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)

Q77·ChemistrySingle correctJEE Main 2021

\mathrm{Al_2O_3}

was leached with alkali to get X. The solution of X on passing of gas Y, forms Z. X, Y and Z respectively are :

(A)X = $\mathrm{Na[Al(OH)_4]}$ , Y= $\mathrm{CO_2}$ , Z = $\mathrm{Al_2O_3.xH_2O}$
(B)X= $\mathrm{Na[Al(OH)_4]}$ , Y= $\mathrm{SO_2}$ , Z = $\mathrm{Al_2O_3}$
(C)X= $\mathrm{Al(OH)_3}$ , Y= $\mathrm{SO_2}$ , Z = $\mathrm{Al_2O_3.xH_2O}$
(D)X = $\mathrm{Al(OH)_3}$ , Y= $\mathrm{CO_2}$ , Z= $\mathrm{Al_2O_3}$

Q78·ChemistrySingle correctJEE Main 2021

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

(A)Sphalerite
(B)Siderite
(C)Malachite
(D)Calamine

Q79·ChemistryMultiple correctJEE Advanced 2020

Which among the following statement(s) is(are) true for the extraction of aluminium from bauxite?

(A)Hydrated $Al_{2}O_{3}$ precipitates, when $CO_{2}$ is bubbled through a solution of sodium aluminate.
(B)Addition of $Na_{3}AlF_{6}$ lowers the melting point of alumina.
(C) $CO_{2}$ is evolved at the anode during electrolysis.
(D)The cathode is a steel vessel with a lining of carbon.

Q80·ChemistrySingle correctJEE Main 2020

The element that can be refined by distillation is:

(A)nickel
(B)zinc
(C)tin
(D)gallium

Q81·ChemistrySingle correctJEE Main 2020

For a reaction, 4M(s) + nO

_2

(g) → 2M

_2

O

_n

(s), the free energy change is plotted as a function of temperature. The temperature below which the oxide is stable could be inferred from the plot as the point at which

(A)the slope changes from negative to positive.
(B)the free energy change shows a change from negative to positive value.
(C)the slope changes from positive to negative.
(D)the slope changes from positive to zero.

Q82·ChemistrySingle correctJEE Main 2020

Boron and silicon of very high purity can be obtained through:

(A)zone refining
(B)electrolytic refining
(C)liquation
(D)vapour phase refining

Q83·ChemistrySingle correctJEE Main 2020

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), (b), (c) and (d)
(B)(c) and (d) only
(C)(a), (c) and (d) only
(D)(b), (c) and (d) only

Q84·ChemistrySingle correctJEE Main 2020

According to the following diagram, A reduces BO

_{2}

when the temperature is:

(A)> 1400 $^{\circ}$ C
(B)< 1400 $^{\circ}$ C
(C)< 1200 $^{\circ}$ C
(D)> 1200 $^{\circ}$ C but < 1400 $^{\circ}$ C

Q85·ChemistrySingle correctJEE Main 2020

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 + SiO

_2

\rightarrow

CaSiO

_3

(b) 3Fe

_2

O

_3

+ CO

\rightarrow

2Fe

_3

O

_4

+ CO

_2

(c) FeO + SiO

_2

\rightarrow

FeSiO

_3

(d) FeO

\rightarrow

Fe +

\dfrac{1}{2}

O

_2

(A)(c) and (d)
(B)(a)
(C)(a) and (d)
(D)(d)

Q86·ChemistrySingle correctJEE Main 2020

The purest form of commercial iron is

(A)scrap iron and pig iron
(B)wrought iron
(C)cast iron
(D)pig iron

Q87·ChemistrySingle correctJEE Main 2020

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

(A)zone refining
(B)vapour phase refining
(C)liquation
(D)distillation

Q88·ChemistrySingle correctJEE Advanced 2019

Calamine, malachite, magnetite and cryolite, respectively, are

(A)ZnSO $_{4}$ , Cu(OH) $_{2}$ , Fe $_{3}$ O $_{4}$ , Na $_{3}$ AlF $_{6}$
(B)ZnCO $_{3}$ , CuCO $_{3}$ .Cu(OH) $_{2}$ , Fe $_{3}$ O $_{4}$ , Na $_{3}$ AlF $_{6}$
(C)ZnSO $_{4}$ , CuCO $_{3}$ , Fe $_{2}$ O $_{3}$ , AlF $_{3}$
(D)ZnCO $_{3}$ , CuCO $_{3}$ , Fe $_{2}$ O $_{3}$ , Na $_{3}$ AlF $_{6}$

Q89·ChemistryMultiple correctJEE Advanced 2019

The cyanide process of gold extraction involves leaching out gold from its ore with CN

^{-}

in the presence of Q in water to form R. Subsequently, R is treated with T to obtain Au and Z. Choose the correct option(s)

(A)Z is $\left[\mathrm{Zn(CN)}_{4}\right]^{2-}$
(B)T is Zn
(C)R is $\left[\mathrm{Au(CN)}_{4}\right]^{-}$
(D)Q is O $_{2}$

Q90·ChemistrySingle correctJEE Main 2019

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)fisher man and reduction
(D)washer man and reduction

Q91·ChemistrySingle correctJEE Main 2019

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)the blistered appearance of copper during the metallurgical process is due to the evolution of CO $_{2}$
(D)pig iron is obtained from cast iron

Q92·ChemistrySingle correctJEE Main 2019

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) \u2013 (b); (II) \u2013 (c); (III) \u2013 (d); (IV) \u2013 (a)
(B)(I) \u2013 (b); (II) \u2013 (d); (III) \u2013 (a); (IV) \u2013 (c)
(C)(I) \u2013 (c); (II) \u2013 (a); (III) \u2013 (b); (IV) \u2013 (d)
(D)(I) \u2013 (c); (II) \u2013 (d); (III) \u2013 (b); (IV) \u2013 (a)

Q93·ChemistrySingle correctJEE Main 2019

The correct statement is:

(A)zincite is a carbonate ore
(B)aniline is a froth stabilizer
(C)zone refining process is used for the refining of titanium
(D)sodium cyanide cannot be used in the metallurgy of silver

Q94·ChemistrySingle correctJEE Main 2019

The one that is not a carbonate is:

(A)bauxite
(B)siderite
(C)calamine
(D)malachite

Q95·ChemistrySingle correctJEE Main 2019

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

(A)saphalerite
(B)malachite
(C)magnetite
(D)cryolite

Q96·ChemistrySingle correctJEE Main 2019

Assertion : For the extraction of iron, haematite ore is used Reason : Haematite is a carbonate ore of iron

(A)Only the reason is correct.
(B)Both the assertion and reason are correct and the reason is the correct explanation for the assertion.
(C)Only the assertion is correct
(D)Both the assertion and reason are correct, but the reason is not the correct explanation for the assertion

Q97·ChemistrySingle correctJEE Main 2019

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

(A)Electrolysis
(B)Thermal reduction
(C)Vapour phase refining
(D)Zone refining

Q98·ChemistrySingle correctJEE Main 2019

The Mond process is used for the:

(A)Extraction of Mo
(B)Extraction of Zn
(C)Purification of Zr and Ti
(D)Purification of Ni

Q99·ChemistrySingle correctJEE Main 2019

The pair that does NOT require calcination is :

(A)ZnO and MgO
(B)ZnO and Fe2O3·xH2O
(C)ZnCO3 and CaO
(D)Fe2O3 and CaCO3·MgCO3

Q100·ChemistrySingle correctJEE Main 2019

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

(A)Pure Aluminium
(B)Carbon
(C)Copper
(D)Platinum

Q101·ChemistrySingle correctJEE Main 2019

The reaction that does NOT define calcinations is:

(A)Fe $_2$ O $_3$ .XH $_2$ O $\xrightarrow{\Delta}$ Fe $_2$ O $_3$ + XH $_2$ O
(B)2Cu $_2$ S + 3O $_2$ $\rightarrow$ 2Cu $_2$ O + 2SO $_2$
(C)ZnCO $_3$ $\xrightarrow{\Delta}$ ZnO + CO $_2$
(D)CaCO $_3$ .MgCO $_3$ $\xrightarrow{\Delta}$ CaO + MgO + 2CO $_2$

Q102·ChemistrySingle correctJEE Main 2019

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 - a, II - b, III - c, IV - d
(B)I - c, II - d, III - b, IV - a
(C)I - c, II - d, III - a, IV - b
(D)I - b, II - c, III - d, IV - a

Q103·ChemistrySingle correctJEE Main 2019

Hall-Herolut's process is given by

(A)Cu $^{2+}$ (aq) + H $_{2}$ (g) $\longrightarrow$ Cu(s) + 2H $^{+}$ (aq)
(B)Cr $_{2}$ O $_{3}$ + 2Al $\longrightarrow$ Al $_{2}$ O $_{3}$ + 2Cr
(C)2Al $_{2}$ O $_{3}$ + 3C $\longrightarrow$ 4Al + 3CO $_{2}$
(D)ZnO + C $\xrightarrow{\text{Coke, 1673 K}}$ Zn + CO

Q104·ChemistrySingle correctJEE Main 2019

The ore that contains both iron and copper is

(A)copper pyrites
(B)malachite
(C)dolomite
(D)azurite

Q105·ChemistrySingle correctJEE Main 2019

The correct statement regarding the given Ellingham diagram is

(A)At 1400°C, Al can be used for the extraction of Zn from ZnO
(B)At 500°C, coke can be used for the extraction of Zn from ZnO
(C)Coke cannot be used for the extraction of Cu from Cu $_2$ O
(D)At 800°C Cu can be used for the extraction of Zn from ZnO

Q106·ChemistryNumericalJEE Advanced 2018

Galena (an ore) is partially oxidized by passing air through it at high temperature. After some time, the passage of air is stopped, but the heating is continued in a closed furnace such that the contents undergo self-reduction. The weight (in kg) of Pb produced per kg of

O_{2}

consumed is ____. (Atomic weights in g

mol^{-1}

: O = 16, S = 32, Pb = 207)

Q107·ChemistryMultiple correctJEE Advanced 2016

Extraction of copper from copper pyrite (

CuFeS_{2}

) involves

(A)crushing followed by concentration of the ore by froth flotation
(B)removal of iron as slag
(C)self-reduction step to produce ‘blister copper’ following evolution of $SO_{2}$
(D)refining of ‘blister copper’ by carbon reduction

Q108·ChemistryMatrix matchJEE Advanced 2015

Match the anionic species given in Column I that are present in the ore(s) given in Column II

Column I	Column II
A.Carbonate	P.Siderite
B.Sulphide	Q.Malachite
C.Hydroxide	R.Bauxite
D.Oxide	S.Calamine
	T.Argentite

Q109·ChemistryMultiple correctJEE Advanced 2015

Copper is purified by electrolytic refining of blister copper. The correct statement(s) about this process is(are)

(A)Impure Cu strip is used as cathode
(B)Acidified aqueous $\mathrm{CuSO_{4}}$ is used as electrolyte
(C)Pure Cu deposits at cathode
(D)Impurities settle as anode – mud

Q110·ChemistryMultiple correctJEE Advanced 2014

Upon heating with

Cu_2S

, the reagent(s) that give copper metal is/are

(A) $CuFeS_2$
(B) $CuO$
(C) $Cu_2O$
(D) $CuSO_4$

Q111·ChemistryMultiple correctJEE Advanced 2013

The carbon–based reduction method is NOT used for the extraction of

(A)tin from $\mathrm{SnO_2}$
(B)iron from $\mathrm{Fe_2O_3}$
(C)aluminium from $\mathrm{Al_2O_3}$
(D)magnesium from $\mathrm{MgCO_3.CaCO_3}$

Q112·ChemistrySingle correctJEE Advanced 2013

Sulfide ores are common for the metals

(A)Ag, Cu and Pb
(B)Ag, Cu and Sn
(C)Ag, Mg and Pb
(D)Al, Cu and Pb

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