Isolation of Elements
112 Questions
Start JEE Mains Test
2021
Q51
JEE Mains
MCQ
14 Mar 2026
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 :
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
2021
Q52
JEE Mains
MCQ
14 Mar 2026
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
2021
Q53
JEE Mains
MCQ
14 Mar 2026
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
2021
Q54
JEE Mains
MCQ
14 Mar 2026
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.
2021
Q55
JEE Mains
MCQ
14 Mar 2026
Match List I with List II : (Both having metallurgical terms)
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 |
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)
2021
Q56
JEE Mains
MCQ
14 Mar 2026
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
2021
Q57
JEE Mains
MCQ
14 Mar 2026
Sulphide ion is soft base and its ores are common for metals.
(a) Pb (b) Al (c) Ag (d) Mg
(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
2021
Q58
JEE Mains
MCQ
14 Mar 2026
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) $ZnC{O_{3(s)}}\buildrel \Delta \over \longrightarrow Zn{O_{(s)}} + C{O_{2(g)}}$
(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
2021
Q59
JEE Mains
MCQ
14 Mar 2026
The metal that can be purified economically by fractional distillation method is :
A.
Fe
B.
Zn
C.
Cu
D.
Ni
2021
Q60
JEE Mains
MCQ
14 Mar 2026
Match List - I with List - II :
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 |
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)
2021
Q61
JEE Mains
MCQ
14 Mar 2026
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
2021
Q62
JEE Mains
MCQ
14 Mar 2026
Match List - I with List - II :
Choose the correct answer from the options given below :
| 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)
2021
Q63
JEE Mains
MCQ
14 Mar 2026
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
2021
Q64
JEE Mains
MCQ
14 Mar 2026
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
2021
Q65
JEE Mains
MCQ
14 Mar 2026
The process that involves the removal of sulphur from the ores is :
A.
Roasting
B.
Smelting
C.
Leaching
D.
Refining
2021
Q66
JEE Mains
MCQ
14 Mar 2026
Match List - I with List - II.
Choose the correct answer from the options given below :
| 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)
2021
Q67
JEE Mains
MCQ
14 Mar 2026
Match List - I with List - II.
Choose the correct answer from the options given below :
| 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)
2021
Q68
JEE Mains
MCQ
14 Mar 2026
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 2nd most abundant element by weight in the Earth's crust.
2021
Q69
JEE Mains
MCQ
14 Mar 2026
Match List - I with List - II.
Choose the most appropriate answer from the options given below :
| 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)
2021
Q70
JEE Mains
MCQ
14 Mar 2026
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
2021
Q71
JEE Mains
MCQ
14 Mar 2026
The method used for the purification of Indium is :
A.
zone refining
B.
vapour phase refining
C.
liquation
D.
van Arkel method
2021
Q72
JEE Mains
MCQ
14 Mar 2026
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
2021
Q73
JEE Mains
MCQ
14 Mar 2026
Math List - I with List - II.
Choose the correct answer from the options given below :
| 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)
2021
Q74
JEE Mains
MCQ
14 Mar 2026
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
2021
Q75
JEE Mains
MCQ
14 Mar 2026
Which of the following ore is concentrated using group 1 cyanide salt ?
A.
Sphalerite
B.
Malachite
C.
Siderite
D.
Calamine
2021
Q76
JEE Mains
Numerical
14 Mar 2026
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
Pb, Sb, Se, Te, Ru, Ag, Au and Pt
Correct Answer: 6
Explanation:
Anode mud contains Sb, Se, Te, Ag, Au and Pt
2020
Q77
JEE Mains
MCQ
14 Mar 2026
The element that can be refined by distillation
is :
A.
gallium
B.
nickel
C.
zinc
D.
tin
2020
Q78
JEE Mains
MCQ
14 Mar 2026
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
2020
Q79
JEE Mains
MCQ
14 Mar 2026
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
2020
Q80
JEE Mains
MCQ
14 Mar 2026
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) 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)
2020
Q81
JEE Mains
MCQ
14 Mar 2026
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
2020
Q82
JEE Mains
MCQ
14 Mar 2026
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
2020
Q83
JEE Mains
MCQ
14 Mar 2026
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) 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)
2020
Q84
JEE Mains
MCQ
14 Mar 2026
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
2020
Q85
JEE Mains
MCQ
14 Mar 2026
The purest from of commercial iron is :
A.
pig iron
B.
wrought iron
C.
cast iron
D.
scrap iron and pig iron
2019
Q86
JEE Mains
MCQ
14 Mar 2026
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
2019
Q87
JEE Mains
MCQ
14 Mar 2026
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
2019
Q88
JEE Mains
MCQ
14 Mar 2026
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.
2019
Q89
JEE Mains
MCQ
14 Mar 2026
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)
2019
Q90
JEE Mains
MCQ
14 Mar 2026
Assertion: For the extraction of iron, haematite
ore is used.
Reason: Haematite is a carbonate ore of iron.
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.
2019
Q91
JEE Mains
MCQ
14 Mar 2026
The one that is not a carbonate ore is :
A.
siderite
B.
bauxite
C.
malachite
D.
calamine
2019
Q92
JEE Mains
MCQ
14 Mar 2026
The ore that contains the metal in the form of
fluoride is :
A.
sphalerite
B.
magnetite
C.
malachite
D.
cryolite
2019
Q93
JEE Mains
MCQ
14 Mar 2026
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
2019
Q94
JEE Mains
MCQ
14 Mar 2026
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
2019
Q95
JEE Mains
MCQ
14 Mar 2026
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
2019
Q96
JEE Mains
MCQ
14 Mar 2026
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
2019
Q97
JEE Mains
MCQ
14 Mar 2026
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)
2019
Q98
JEE Mains
MCQ
14 Mar 2026
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]–
2019
Q99
JEE Mains
MCQ
14 Mar 2026
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
2019
Q100
JEE Mains
MCQ
14 Mar 2026
The correct statement regarding the given Ellingham diagram is :
A.
At 1400oC, Al can be used for the extraction of Zn from ZnO
B.
At 500oC, 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 800oC, Cu can be used for the extraction of Zn from ZnO.