The JEE Main Chemistry section requires speed and accuracy, along with a thorough understanding of the General Principles and Processes of Isolation of Elements. This article provides a set of JEE Main PYQs on General Principles and Processes of Isolation of Elements to help you understand the topic and improve your problem-solving skills with the help of detailed solutions by ensuring conceptual clarity, which will help you in the JEE Main 2026 preparation.
Whether you're revising the basics or testing your knowledge, these JEE Main PYQs will serve as a valuable practice resource.
The JEE Main 2026 exam is likely to continue on the same pattern as JEE Main 2025. Out of 90 questions, students can expect a fair mix from all three subjects. To get an edge, going through JEE Main previous year questions (PYQs) is one of the best strategies.
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JEE Main PYQs on General Principles and Processes of Isolation of Elements
1.
Which of the following is used as a stabilizer during the concen tration of sulphide ores?
- Fatty acids
- Pine oil
- Cresol
- Xanthates
2.
In isolation of which one of the following metals from their ores, the use of cyanide salt is not commonly involved?- Zinc
- Gold
- Silver
- Copper
3.
The metal which is extracted by oxidation and subsequent reduction from its ore is:Ag
- Cu
- Fe
- Al
4.
Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason RAssertion 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.- Both A and R are correct and R is the correct explanation of A
- Both A and R are correct but R is not the correct explanation of A
- A is correct but R is not correct
- A is not correct but R is correct
5.
On reaction of Lead Sulphide with dilute nitric acid which of the following is not formed ?- Lead nitrate
- Sulphur
- Nitric oxide
- Nitrous oxide
6.
Cast iron is used for the manufacture of :- wrought iron and pig iron
- wrought iron and steel
- wrought iron, pig iron and steel
- pig iron, scrap iron and steel
7.
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 $Al _2 O _3$ is mixed with $Na _3 AlF _6$ 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:- Both Statement I and Statement II are correct
- Both Statement I and Statement II are incorrect
- Statement I is correct but Statement II is incorrect
- Statement I is incorrect but Statement II is correct
8.
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 A-R, B-Q, C-S, D-P
A-Q, B-P, C-S, D-R
A-P, B-S, C-Q, D-R
A-S, B-P, C-R, D-Q
9.
According to the following diagram, A reduces $BO_2$ when the temperature is :- $> \,1200\,^{\circ}C$ but $< 1400\, ^{\circ}C$
- $>\, 1400 \,^\circ C$
- $< 1200\, ^\circ C$
- $<1200 \, ^\circ C$
10.
Which of the reaction is suitable for concentrating ore by leaching process?- \(2 Cu _2 S +3 O _2 \rightarrow 2 Cu _2 O +2 SO _2\)
- \(Fe _3 O _4+ CO \rightarrow 3 FeO + CO _2\)
- \(Al _2 O _3+2 NaOH +3 H _2 O \rightarrow 2 Na \left[ Al ( OH )_4\right]\)
- \(Al _2 O _3+6 Mg \rightarrow 6 MgO +4 Al\)
11.
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
Only 1st is correct
Only 2nd is correct
Both are correct
Both are incorrect
12.
Which of the following shows an incorrect method of refining?- Zinc : Liquation
- Copper : Electrolysis
- Titanium : Van Arkel Method
- Nickel : Mond’s Process
13.
Refining using liquation method is the most suitable for metals with :- Low melting point
- High boiling point
- High electrical conductivity
- Less tendency to be soluble in melts than impurities
14.
In the Hall-Heroult process, aluminium is formed at the cathode. The cathode is made out of :- Platinum
- Carbon
- Pure aluminium
- Copper
15.
2[Au(CN)2]– + Zn \(\to\) [Zn(CN)4]2– + 2Au\(\downarrow\) is which of these
(A) Redox reaction
(B) Displacement reaction
(C) Combination reaction
(D) Decomposition reaction- A & B
- B only
- A & D
- B & D
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