JEE-MAIN SERIES Chemistry
General Principles And Processes Of Isolation Of Elements
34 previous year questions.
Volume: 34 Ques
Yield: High
High-Yield Trend
1
2024 8
2023 4
2022 7
2021 2
2020 4
2019 2
2018 2
2016 2
2015 2
2013 Chapter Questions 34 MCQs
01
PYQ 2013
medium
chemistry ID: jee-main
In Goldschmidt aluminothermic process which of the following reducing agents is used:
1
calcium
2
coke
3
-powder
4
sodium
02
PYQ 2013
medium
chemistry ID: jee-main
Calcination is the process in which:
1
ore is heated above its melting point to expel or or
2
ore is heated below its melting point to expel volatile impurities
3
ore is heated above its melting point to remove and as , and respectively
4
ore is heated below its melting point to expel or
03
PYQ 2015
easy
chemistry ID: jee-main
Calamine is an ore of :
1
Aluminium
2
Copper
3
Iron
4
Zinc
04
PYQ 2015
medium
chemistry ID: jee-main
In the context of the Hall-Heroult process for the extraction of , which of the following statements is false?
1
and are produced in this process
2
is mixed with which lowers the melting point of the mixture and brings conductivity
3
is reduced at the cathode to form
4
serves as the electrolyte
05
PYQ 2016
easy
chemistry ID: jee-main
Which one of the following ores is best concentrated by froth-flotation method?
1
Galena
2
Cassiterite
3
Magnetite
4
Malachite
06
PYQ 2016
medium
chemistry ID: jee-main
Extraction of copper by smelting uses silica as an additive to remove :
1
2
3
4
07
PYQ 2018
medium
chemistry ID: jee-main
In the extraction of copper from its sulphide ore, metal is finally obtained by the oxidation of cuprous sulphide with :
1
2
3
4
08
PYQ 2018
medium
chemistry ID: jee-main
In the leaching method, bauxite ore is digested with a concentrated solution of NaOH that produces ?X?. When gas is passed through the aqueous solution of ?X?, a hydrated compound ?Y? is precipitated. ?X? and ?Y? respectively are :
1
and
2
and
3
and
4
and
09
PYQ 2019
medium
chemistry ID: jee-main
In the Hall-Heroult process, aluminium is formed at the cathode. The cathode is made out of :
1
Platinum
2
Carbon
3
Pure aluminium
4
Copper
10
PYQ 2019
medium
chemistry ID: jee-main
The pair that does NOT require calcination is:
1
and
2
and
3
and
4
and
11
PYQ 2019
medium
chemistry ID: jee-main
Hall-Heroult's process is given by :
1
2
3
4
12
PYQ 2019
medium
chemistry ID: jee-main
With respect to an ore, Ellingham diagram helps to predict the feasibility of its -
1
Vapour phase refining
2
Zone refining
3
Electrolysis
4
Thermal reduction
13
PYQ 2020
easy
chemistry ID: jee-main
Cast iron is used for the manufacture of :
14
PYQ 2020
medium
chemistry ID: jee-main
According to the following diagram, A reduces when the temperature is :
1
but
2
3
4
15
PYQ 2021
medium
chemistry ID: jee-main
Choose the most appropriate answer from the options given below : 
1
(a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)
2
(a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
3
(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
4
(a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)
16
PYQ 2021
medium
chemistry ID: jee-main
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.
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.
1
Both Statement I and Statement II are true.
2
Both Statement I and Statement II are false.
3
Statement I is true but Statement II is false.
4
Statement I is false but Statement II is true.
17
PYQ 2021
medium
chemistry ID: jee-main
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 vs temperature.
Statement II : The value of 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 vs temperature.
Statement II : The value of 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 :
1
Both Statement I and Statement II are true
2
Both Statement I and Statement II are false
3
Statement I is true but Statement II is false
4
Statement I is false but Statement II is true
18
PYQ 2021
medium
chemistry ID: jee-main
Which refining process is generally used in the purification of low melting metals ?
1
Electrolysis
2
Liquation
3
Zone refining
4
Chromatographic method
19
PYQ 2021
medium
chemistry ID: jee-main
The addition of silica during the extraction of copper from its sulphide ore
1
converts copper sulphide into copper silicate
2
reduces copper sulphide into metallic copper
3
converts iron oxide into iron silicate
4
reduces the melting point of the reaction mixture
20
PYQ 2021
medium
chemistry ID: jee-main
The method used for the purification of Indium is:
1
van Arkel method
2
liquation
3
zone refining
4
vapour phase refining
21
PYQ 2021
medium
chemistry ID: jee-main
The statement that is INCORRECT about Ellingham diagram is :
1
provides idea about reduction of metal oxide.
2
provides idea about the reaction rate.
3
provides idea about free energy change.
4
provides idea about changes in the phases during the reaction.
22
PYQ 2022
medium
chemistry ID: jee-main
Which of the reaction is suitable for concentrating ore by leaching process?
1
2
3
4
23
PYQ 2022
medium
chemistry ID: jee-main
Refining using liquation method is the most suitable for metals with :
1
Low melting point
2
High boiling point
3
High electrical conductivity
4
Less tendency to be soluble in melts than impurities
24
PYQ 2022
medium
chemistry ID: jee-main
In isolation of which one of the following metals from their ores, the use of cyanide salt is not commonly involved?
1
Zinc
2
Gold
3
Silver
4
Copper
25
PYQ 2022
medium
chemistry ID: jee-main
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 ΔG⊖ 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.
1
Both A and R are correct and R is the correct explanation of A
2
Both A and R are correct but R is not the correct explanation of A
3
A is correct but R is not correct
4
A is not correct but R is correct
26
PYQ 2023
medium
chemistry ID: jee-main
Match the following:
| Column-I | Column-II |
| (A) Zone refining | (P) pig iron |
| (B) Electrolysis | (Q) Al |
| (C) Reverberatory furnace | (R) Si |
| (D) Blast furnace | (S) Cu |
1
A-R, B-Q, C-S, D-P
2
A-Q, B-P, C-S, D-R
3
A-P, B-S, C-Q, D-R
4
A-S, B-P, C-R, D-Q
27
PYQ 2023
medium
chemistry ID: jee-main
The metal which is extracted by oxidation and subsequent reduction from its ore is:
1
Ag
2
Cu
3
Fe
4
Al
28
PYQ 2023
medium
chemistry ID: jee-main
Which of the following shows an incorrect method of refining?
1
Zinc : Liquation
2
Copper : Electrolysis
3
Titanium : Van Arkel Method
4
Nickel : Mond’s Process
29
PYQ 2023
medium
chemistry ID: jee-main
Which of the following is used as a stabilizer during the concen tration of sulphide ores?
1
Fatty acids
2
Pine oil
3
Cresol
4
Xanthates
30
PYQ 2023
hard
chemistry ID: jee-main
Among following compounds, the number of those present in copper matte is ___ .
31
PYQ 2023
medium
chemistry ID: jee-main
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 is mixed with 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:
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 is mixed with 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:
1
Both Statement I and Statement II are correct
2
Both Statement I and Statement II are incorrect
3
Statement I is correct but Statement II is incorrect
4
Statement I is incorrect but Statement II is correct
32
PYQ 2023
easy
chemistry ID: jee-main
2[Au(CN)2]– + Zn [Zn(CN)4]2– + 2Au is which of these
(A) Redox reaction
(B) Displacement reaction
(C) Combination reaction
(D) Decomposition reaction
1
A & B
2
B only
3
A & D
4
B & D
33
PYQ 2023
medium
chemistry ID: jee-main
Given below are two statements, one is labelled as Statement-1 and the other is labelled as Statement-2: Statement-1: Sulphides are converted into oxide first. Statement-2: Because oxides can be reduced easily. In the light of the above statements, choose the correct answer from the options given below
1
Only 1st is correct
2
Only 2nd is correct
3
Both are correct
4
Both are incorrect
34
PYQ 2024
medium
chemistry ID: jee-main
On reaction of Lead Sulphide with dilute nitric acid which of the following is not formed ?
1
Lead nitrate
2
Sulphur
3
Nitric oxide
4
Nitrous oxide