JEE Main MCQ & Objective Questions
The JEE Main exam is a crucial step for students aspiring to enter prestigious engineering colleges in India. It tests not only knowledge but also the ability to apply concepts effectively. Practicing MCQs and objective questions is essential for scoring better, as it helps in familiarizing students with the exam pattern and enhances their problem-solving skills. Engaging with practice questions allows students to identify important questions and strengthen their exam preparation.
What You Will Practise Here
Fundamental concepts of Physics, Chemistry, and Mathematics
Key formulas and their applications in problem-solving
Important definitions and theories relevant to JEE Main
Diagrams and graphical representations for better understanding
Numerical problems and their step-by-step solutions
Previous years' JEE Main questions for real exam experience
Time management strategies while solving MCQs
Exam Relevance
The topics covered in JEE Main are not only significant for the JEE exam but also appear in various CBSE and State Board examinations. Many concepts are shared with the NEET syllabus, making them relevant across multiple competitive exams. Common question patterns include conceptual applications, numerical problems, and theoretical questions that assess a student's understanding of core subjects.
Common Mistakes Students Make
Misinterpreting the question stem, leading to incorrect answers
Neglecting units in numerical problems, which can change the outcome
Overlooking negative marking and not managing time effectively
Relying too heavily on rote memorization instead of understanding concepts
Failing to review and analyze mistakes from practice tests
FAQs
Question: How can I improve my speed in solving JEE Main MCQ questions?Answer: Regular practice with timed quizzes and focusing on shortcuts can significantly enhance your speed.
Question: Are the JEE Main objective questions similar to previous years' papers?Answer: Yes, many questions are based on previous years' patterns, so practicing them can be beneficial.
Question: What is the best way to approach JEE Main practice questions?Answer: Start with understanding the concepts, then attempt practice questions, and finally review your answers to learn from mistakes.
Now is the time to take charge of your preparation! Dive into solving JEE Main MCQs and practice questions to test your understanding and boost your confidence for the exam.
Q. What is the primary monomer used in the production of polyethylene?
A.
Propylene
B.
Ethylene
C.
Styrene
D.
Vinyl chloride
Show solution
Solution
Polyethylene is primarily made from the polymerization of ethylene monomers.
Correct Answer:
B
— Ethylene
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Q. What is the primary monomer used to produce polystyrene?
A.
Ethylene
B.
Propylene
C.
Styrene
D.
Vinyl chloride
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Solution
Styrene is the primary monomer used to produce polystyrene.
Correct Answer:
C
— Styrene
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Q. What is the primary oxidation state of aluminum in aluminum chloride (AlCl3)?
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Solution
In aluminum chloride, aluminum has an oxidation state of +3.
Correct Answer:
C
— +3
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Q. What is the primary oxidation state of chlorine in potassium chloride (KCl)?
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Solution
In potassium chloride, chlorine has an oxidation state of -1.
Correct Answer:
A
— -1
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Q. What is the primary oxidation state of chlorine in sodium chloride (NaCl)?
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Solution
In NaCl, chlorine has an oxidation state of -1.
Correct Answer:
A
— -1
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Q. What is the primary oxidation state of chromium in CrO3?
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Solution
In CrO3, chromium has a primary oxidation state of +6.
Correct Answer:
C
— +6
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Q. What is the primary oxidation state of group 14 elements in their compounds?
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Solution
Group 14 elements typically exhibit a +4 oxidation state in their compounds.
Correct Answer:
B
— +4
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Q. What is the primary oxidation state of manganese in KMnO4?
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Solution
In KMnO4, manganese has an oxidation state of +7.
Correct Answer:
D
— +7
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Q. What is the primary oxidation state of manganese in MnO4-?
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Solution
In MnO4-, manganese has an oxidation state of +7.
Correct Answer:
D
— +7
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Q. What is the primary oxidation state of sulfur in sulfuric acid (H2SO4)?
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Solution
In sulfuric acid (H2SO4), sulfur has an oxidation state of +6.
Correct Answer:
B
— +6
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Q. What is the primary pollutant in photochemical smog?
A.
Carbon monoxide
B.
Nitrogen oxides
C.
Ozone
D.
Sulfur dioxide
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Solution
Ozone is a key component of photochemical smog, formed by the reaction of sunlight with pollutants like nitrogen oxides.
Correct Answer:
C
— Ozone
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Q. What is the primary process involved in the adsorption of gases on solid surfaces?
A.
Diffusion
B.
Condensation
C.
Chemical reaction
D.
Van der Waals forces
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Solution
Adsorption of gases on solid surfaces primarily occurs due to Van der Waals forces, which are weak intermolecular forces.
Correct Answer:
D
— Van der Waals forces
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Q. What is the primary product formed when hydrogen reacts with oxygen?
A.
Water
B.
Hydrogen peroxide
C.
Ozone
D.
Hydroxyl radical
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Solution
The primary product of the reaction between hydrogen and oxygen is water (H2O).
Correct Answer:
A
— Water
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Q. What is the primary product of a nuclear fusion reaction in stars?
A.
Helium
B.
Hydrogen
C.
Carbon
D.
Uranium
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Solution
The primary product of nuclear fusion reactions in stars is helium, formed from the fusion of hydrogen nuclei.
Correct Answer:
A
— Helium
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Q. What is the primary product of nuclear fusion in stars like the Sun?
A.
Helium
B.
Hydrogen
C.
Carbon
D.
Oxygen
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Solution
The primary product of nuclear fusion in stars like the Sun is helium, formed from the fusion of hydrogen nuclei.
Correct Answer:
A
— Helium
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Q. What is the primary product of the complete combustion of hydrocarbons?
A.
Carbon monoxide
B.
Carbon dioxide
C.
Water
D.
Oxygen
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Solution
The complete combustion of hydrocarbons primarily produces carbon dioxide and water.
Correct Answer:
B
— Carbon dioxide
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Q. What is the primary product of the hydrolysis of an ester?
A.
Alcohol
B.
Carboxylic acid
C.
Both alcohol and carboxylic acid
D.
None of the above
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Solution
Hydrolysis of an ester produces both an alcohol and a carboxylic acid.
Correct Answer:
C
— Both alcohol and carboxylic acid
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Q. What is the primary product of the reaction between 1-chlorobutane and potassium cyanide?
A.
1-cyanobutane
B.
2-cyanobutane
C.
Butyronitrile
D.
Butyl cyanide
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Solution
The reaction leads to the formation of 1-cyanobutane through nucleophilic substitution.
Correct Answer:
A
— 1-cyanobutane
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Q. What is the primary product of the reaction between a carboxylic acid and an alcohol in the presence of an acid catalyst?
A.
Aldehyde
B.
Ester
C.
Ketone
D.
Amide
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Solution
The reaction between a carboxylic acid and an alcohol in the presence of an acid catalyst produces an ester.
Correct Answer:
B
— Ester
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Q. What is the primary product of the reaction between ethene and bromine?
A.
1,2-dibromoethane
B.
Bromoethane
C.
Ethane
D.
Bromobenzene
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Solution
Ethene reacts with bromine to form 1,2-dibromoethane through an electrophilic addition mechanism.
Correct Answer:
A
— 1,2-dibromoethane
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Q. What is the primary product when 1-bromo-2-methylpropane reacts with KOH in ethanol?
A.
2-methylpropene
B.
1-methylpropene
C.
2-bromopropane
D.
no reaction
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Solution
The reaction leads to the formation of 2-methylpropene through an elimination reaction.
Correct Answer:
A
— 2-methylpropene
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Q. What is the primary product when 1-chloropropane reacts with potassium tert-butoxide?
A.
Propene
B.
2-methylpropane
C.
1-butene
D.
No reaction
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Solution
The reaction of 1-chloropropane with potassium tert-butoxide leads to the formation of propene via an elimination reaction.
Correct Answer:
A
— Propene
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Q. What is the primary product when a carboxylic acid is reduced with lithium aluminum hydride (LiAlH4)?
A.
Alcohol
B.
Aldehyde
C.
Ketone
D.
Ester
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Solution
Lithium aluminum hydride reduces carboxylic acids to primary alcohols.
Correct Answer:
A
— Alcohol
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Q. What is the primary product when a carboxylic acid reacts with thionyl chloride (SOCl2)?
A.
Acid chloride
B.
Ester
C.
Alcohol
D.
Aldehyde
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Solution
The primary product of the reaction between a carboxylic acid and thionyl chloride is an acid chloride.
Correct Answer:
A
— Acid chloride
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Q. What is the primary product when ammonia reacts with an alkyl halide?
A.
Amine
B.
Amide
C.
Alkane
D.
Alcohol
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Solution
The primary product of the reaction between ammonia and an alkyl halide is an amine.
Correct Answer:
A
— Amine
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Q. What is the primary product when an alcohol is oxidized?
A.
Alkane
B.
Aldehyde
C.
Ketone
D.
Carboxylic acid
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Solution
The primary product of the oxidation of a primary alcohol is an aldehyde.
Correct Answer:
B
— Aldehyde
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Q. What is the primary product when chlorobenzene is treated with sodium hydroxide at high temperature?
A.
Phenol
B.
Benzene
C.
Chlorobenzene
D.
Sodium chloride
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Solution
Chlorobenzene reacts with sodium hydroxide at high temperature to form phenol.
Correct Answer:
A
— Phenol
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Q. What is the primary product when ethene reacts with water in the presence of an acid?
A.
Ethanol
B.
Ethane
C.
Ethanoic acid
D.
Ethylene glycol
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Solution
The reaction of ethene with water in the presence of an acid (hydration) produces ethanol.
Correct Answer:
A
— Ethanol
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Q. What is the primary product when hydrogen reacts with oxygen?
A.
Water
B.
Hydrogen peroxide
C.
Ozone
D.
Hydroxyl radical
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Solution
The primary product of the reaction between hydrogen and oxygen is water (H2O).
Correct Answer:
A
— Water
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Q. What is the primary product when magnesium reacts with dilute hydrochloric acid?
A.
Magnesium chloride
B.
Hydrogen gas
C.
Magnesium hydroxide
D.
Magnesium oxide
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Solution
The primary products of the reaction between magnesium and dilute hydrochloric acid are magnesium chloride (MgCl2) and hydrogen gas (H2).
Correct Answer:
A
— Magnesium chloride
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