Q. What is the main feature of elastomers?
A.
High tensile strength
B.
Elasticity
C.
Brittleness
D.
Thermal stability
Show solution
Solution
Elastomers are characterized by their elasticity, allowing them to stretch and return to their original shape.
Correct Answer:
B
— Elasticity
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Q. What is the main feature of terminal alkynes?
A.
They have a triple bond in the middle
B.
They can form carbanions
C.
They are less acidic than alkenes
D.
They cannot undergo substitution reactions
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Solution
Terminal alkynes can form carbanions due to the acidity of the hydrogen atom attached to the sp-hybridized carbon.
Correct Answer:
B
— They can form carbanions
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Q. What is the main feature that distinguishes alkynes from alkenes?
A.
Presence of double bonds
B.
Presence of triple bonds
C.
Saturation
D.
Molecular weight
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Solution
Alkynes are distinguished from alkenes by the presence of triple bonds.
Correct Answer:
B
— Presence of triple bonds
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Q. What is the main function of a salt bridge in a galvanic cell?
A.
To provide a path for electrons
B.
To maintain charge balance
C.
To increase voltage
D.
To decrease resistance
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Solution
The main function of a salt bridge is to maintain charge balance by allowing ions to flow.
Correct Answer:
B
— To maintain charge balance
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Q. What is the main function of carbohydrates in living organisms?
A.
Genetic information
B.
Energy storage
C.
Catalysis
D.
Structural support
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Solution
The main function of carbohydrates is energy storage and providing energy to living organisms.
Correct Answer:
B
— Energy storage
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Q. What is the main function of lipids in biological systems?
A.
Energy storage
B.
Genetic information
C.
Catalysis
D.
Structural support
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Solution
Lipids primarily function in energy storage, as well as forming cell membranes.
Correct Answer:
A
— Energy storage
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Q. What is the main industrial method for producing hydrogen?
A.
Electrolysis of water
B.
Steam reforming of natural gas
C.
Thermal decomposition of water
D.
Photosynthesis
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Solution
The main industrial method for producing hydrogen is steam reforming of natural gas.
Correct Answer:
B
— Steam reforming of natural gas
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Q. What is the main ingredient in most sunscreens?
A.
Zinc oxide
B.
Vitamin E
C.
Aloe vera
D.
Coconut oil
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Solution
Zinc oxide is a common active ingredient in sunscreens that protects against UV rays.
Correct Answer:
A
— Zinc oxide
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Q. What is the main ingredient in vinegar that gives it its sour taste?
A.
Acetic acid
B.
Citric acid
C.
Lactic acid
D.
Formic acid
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Solution
Vinegar contains acetic acid, which is responsible for its sour taste.
Correct Answer:
A
— Acetic acid
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Q. What is the main ingredient in vinegar?
A.
Acetic acid
B.
Citric acid
C.
Lactic acid
D.
Formic acid
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Solution
Vinegar primarily consists of acetic acid, which gives it its sour taste.
Correct Answer:
A
— Acetic acid
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Q. What is the main monomer used to produce polyethylene?
A.
Propylene
B.
Ethylene
C.
Butylene
D.
Styrene
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Solution
Ethylene is the main monomer used to produce polyethylene through addition polymerization.
Correct Answer:
B
— Ethylene
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Q. What is the main product of the complete combustion of alkanes?
A.
Carbon monoxide
B.
Carbon dioxide
C.
Water
D.
Oxygen
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Solution
The main products of the complete combustion of alkanes are carbon dioxide and water.
Correct Answer:
B
— Carbon dioxide
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Q. What is the main product of the complete combustion of hydrocarbons?
A.
Carbon monoxide
B.
Water
C.
Carbon dioxide
D.
Hydrogen gas
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Solution
The complete combustion of hydrocarbons produces carbon dioxide and water.
Correct Answer:
C
— Carbon dioxide
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Q. What is the main product of the complete combustion of propane (C3H8)?
A.
Carbon monoxide
B.
Carbon dioxide and water
C.
Soot
D.
Hydrogen gas
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Solution
The complete combustion of propane produces carbon dioxide and water.
Correct Answer:
B
— Carbon dioxide and water
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Q. What is the main product of the dehydration of an alcohol?
A.
Alkene
B.
Alkane
C.
Aldehyde
D.
Ketone
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Solution
The dehydration of an alcohol typically yields an alkene.
Correct Answer:
A
— Alkene
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Q. What is the main product of the dehydration of ethanol?
A.
Ethylene
B.
Acetaldehyde
C.
Ethane
D.
Diethyl ether
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Solution
The dehydration of ethanol primarily produces ethylene (ethene) through the elimination of water.
Correct Answer:
A
— Ethylene
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Q. What is the main product of the electrolysis of water?
A.
Hydrogen gas
B.
Oxygen gas
C.
Hydrochloric acid
D.
Hydrogen peroxide
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Solution
The main products of the electrolysis of water are hydrogen gas (H2) and oxygen gas (O2).
Correct Answer:
A
— Hydrogen gas
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Q. What is the main product of the hydrogenation of benzene?
A.
Cyclohexane
B.
Toluene
C.
Phenol
D.
Benzaldehyde
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Solution
The hydrogenation of benzene results in the formation of cyclohexane, a saturated hydrocarbon.
Correct Answer:
A
— Cyclohexane
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Q. What is the main product of the hydrolysis of an ester?
A.
Alcohol
B.
Carboxylic acid
C.
Alkene
D.
Ketone
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Solution
The hydrolysis of an ester produces a carboxylic acid and an alcohol.
Correct Answer:
B
— Carboxylic acid
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Q. What is the main product of the nitration of benzene?
A.
Nitrobenzene
B.
Benzene-1,2-diol
C.
Benzaldehyde
D.
Benzyl alcohol
Show solution
Solution
The nitration of benzene typically produces nitrobenzene as the main product through electrophilic substitution.
Correct Answer:
A
— Nitrobenzene
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Q. What is the main product of the oxidation of a primary alcohol?
A.
Aldehyde
B.
Ketone
C.
Carboxylic acid
D.
Alcohol
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Solution
Oxidation of a primary alcohol typically leads to the formation of a carboxylic acid.
Correct Answer:
C
— Carboxylic acid
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Q. What is the main product of the reaction between an alcohol and a carboxylic acid?
A.
Ester
B.
Ether
C.
Aldehyde
D.
Ketone
Show solution
Solution
The reaction between an alcohol and a carboxylic acid typically produces an ester.
Correct Answer:
A
— Ester
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Q. What is the main product of the reaction between ethene and bromine?
A.
Bromobutane
B.
1,2-Dibromoethane
C.
Bromoethane
D.
Ethyl bromide
Show solution
Solution
The reaction of ethene with bromine results in the formation of 1,2-dibromoethane through an electrophilic addition mechanism.
Correct Answer:
B
— 1,2-Dibromoethane
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Q. What is the main product of the reaction between hydrogen and oxygen?
A.
Ozone
B.
Water
C.
Hydrogen peroxide
D.
Hydrochloric acid
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Solution
The main product of the reaction between hydrogen and oxygen is water (H2O).
Correct Answer:
B
— Water
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Q. What is the main product of the reaction between sodium and chlorine?
A.
NaCl
B.
NaCl2
C.
Na2Cl
D.
Na2Cl2
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Solution
The main product of the reaction between sodium and chlorine is sodium chloride (NaCl).
Correct Answer:
A
— NaCl
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Q. What is the main product of the reaction of 1-chloropropane with magnesium in dry ether?
A.
Propane
B.
Grignard reagent
C.
Propyl chloride
D.
Magnesium chloride
Show solution
Solution
The reaction forms a Grignard reagent, which is an organomagnesium compound.
Correct Answer:
B
— Grignard reagent
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Q. What is the main product of the reaction of benzene with bromine in the presence of FeBr3?
A.
Bromobenzene
B.
Benzyl bromide
C.
Bromobenzyl alcohol
D.
Benzene remains unchanged
Show solution
Solution
The reaction of benzene with bromine in the presence of FeBr3 leads to the formation of bromobenzene through electrophilic aromatic substitution.
Correct Answer:
A
— Bromobenzene
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Q. What is the main product of the reaction of ethene with ozone followed by zinc reduction?
A.
Acetaldehyde
B.
Ethylene glycol
C.
Acetic acid
D.
Ethane
Show solution
Solution
The ozonolysis of ethene followed by zinc reduction yields acetaldehyde.
Correct Answer:
A
— Acetaldehyde
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Q. What is the main product of the thermal decomposition of calcium carbonate?
A.
Calcium oxide
B.
Calcium hydroxide
C.
Carbon dioxide
D.
Calcium bicarbonate
Show solution
Solution
The thermal decomposition of calcium carbonate produces calcium oxide and carbon dioxide.
Correct Answer:
A
— Calcium oxide
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Q. What is the main product when 1-bromopropane is treated with aqueous KOH?
A.
Propene
B.
1-propanol
C.
2-propanol
D.
No reaction
Show solution
Solution
1-bromopropane reacts with aqueous KOH to undergo substitution, yielding 1-propanol as the main product.
Correct Answer:
B
— 1-propanol
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Chemistry Syllabus (JEE Main) MCQ & Objective Questions
The Chemistry Syllabus for JEE Main is crucial for students aiming to excel in their exams. Understanding this syllabus not only helps in grasping fundamental concepts but also enhances performance in objective questions and MCQs. Regular practice with these types of questions is essential for scoring better and mastering important topics.
What You Will Practise Here
Basic Concepts of Chemistry
Atomic Structure and Chemical Bonding
States of Matter: Gases and Liquids
Thermodynamics and Thermochemistry
Equilibrium: Chemical and Ionic
Redox Reactions and Electrochemistry
Hydrocarbons and Environmental Chemistry
Exam Relevance
The Chemistry syllabus is a significant part of CBSE, State Boards, NEET, and JEE exams. Questions from this syllabus often appear in various formats, including multiple-choice questions, assertion-reason type questions, and numerical problems. Familiarity with the common question patterns can greatly enhance your exam preparation and confidence.
Common Mistakes Students Make
Misunderstanding the periodic trends and their implications.
Confusing different types of chemical bonds and their properties.
Neglecting to balance redox reactions properly.
Overlooking the significance of units in thermodynamic calculations.
Failing to apply concepts of equilibrium in problem-solving.
FAQs
Question: What are the key topics I should focus on in the Chemistry syllabus for JEE Main?Answer: Focus on atomic structure, chemical bonding, thermodynamics, and equilibrium as they are frequently tested.
Question: How can I improve my performance in Chemistry MCQs?Answer: Regular practice with past papers and understanding concepts deeply will help you tackle MCQs effectively.
Start your journey towards mastering the Chemistry Syllabus (JEE Main) by solving practice MCQs today. Test your understanding and build confidence for your exams!