Q. Which of the following is the correct structure for 2,3-dimethyl-2-butanol?
A.
CH3C(CH3)(OH)C(CH3)CH3
B.
CH3C(CH3)C(OH)CH2CH3
C.
CH3C(OH)(CH3)C(CH3)CH3
D.
CH3C(CH3)C(CH3)CH2OH
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Solution
The correct structure has the hydroxyl group on the second carbon with two methyl groups on the same carbon.
Correct Answer:
A
— CH3C(CH3)(OH)C(CH3)CH3
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Q. Which of the following is the correct structure for 2-butyne?
A.
CH3-C≡C-CH3
B.
CH3-CH≡C-CH3
C.
CH3-C=C-CH3
D.
C≡C-CH2-CH3
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Solution
2-butyne has the structure CH3-CH≡C-CH3, with the triple bond between the second and third carbon.
Correct Answer:
B
— CH3-CH≡C-CH3
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Q. Which of the following is the correct structure for 2-methylpropane?
A.
CH3-CH(CH3)-CH2-CH3
B.
CH3-CH2-CH(CH3)-CH3
C.
CH3-CH(CH3)-CH(CH3)-CH3
D.
CH3-CH2-CH2-CH(CH3)
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Solution
2-methylpropane has a branched structure with a methyl group on the second carbon.
Correct Answer:
B
— CH3-CH2-CH(CH3)-CH3
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Q. Which of the following is the correct unit for measuring the amount of substance?
A.
Liter
B.
Gram
C.
Mole
D.
Cubic meter
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Solution
The mole is the SI unit for measuring the amount of substance.
Correct Answer:
C
— Mole
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Q. Which of the following is the correct unit for molality?
A.
mol/L
B.
mol/kg
C.
mol/mL
D.
mol/1000g
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Solution
Molality is defined as moles of solute per kilogram of solvent, hence the unit is mol/kg.
Correct Answer:
B
— mol/kg
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Q. Which of the following is the correct unit for molarity?
A.
mol/L
B.
mol/kg
C.
g/L
D.
g/mol
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Solution
Molarity is defined as moles of solute per liter of solution, hence the unit is mol/L.
Correct Answer:
A
— mol/L
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Q. Which of the following is the functional group of aldehydes?
A.
-CHO
B.
-CO-
C.
-C=O
D.
-OH
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Solution
Aldehydes contain the functional group -CHO, which is characterized by a carbonyl group (C=O) bonded to a hydrogen atom.
Correct Answer:
A
— -CHO
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Q. Which of the following is the functional group of carboxylic acids?
A.
-OH
B.
-COOH
C.
-CHO
D.
-C=O
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Solution
Carboxylic acids contain the -COOH functional group.
Correct Answer:
B
— -COOH
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Q. Which of the following is the functional group present in alcohols?
A.
-OH
B.
-COOH
C.
-NH2
D.
-CHO
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Solution
Alcohols contain the hydroxyl group (-OH) as their functional group.
Correct Answer:
A
— -OH
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Q. Which of the following is the general formula for alkenes?
A.
C_nH_(2n)
B.
C_nH_(2n+2)
C.
C_nH_(2n-2)
D.
C_nH_n
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Solution
The general formula for alkenes is C_nH_(2n), where n is the number of carbon atoms.
Correct Answer:
A
— C_nH_(2n)
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Q. Which of the following is the general formula for alkynes?
A.
C_nH_(2n+2)
B.
C_nH_(2n)
C.
C_nH_(2n-2)
D.
C_nH_(2n-1)
Show solution
Solution
The general formula for alkynes is C_nH_(2n-2), where n is the number of carbon atoms.
Correct Answer:
C
— C_nH_(2n-2)
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Q. Which of the following is the heaviest alkali metal?
A.
Lithium
B.
Sodium
C.
Potassium
D.
Cesium
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Solution
Cesium (Cs) is the heaviest alkali metal.
Correct Answer:
D
— Cesium
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Q. Which of the following is the molecular formula for butane?
A.
C3H8
B.
C4H10
C.
C5H12
D.
C6H14
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Solution
Butane has the molecular formula C4H10.
Correct Answer:
B
— C4H10
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Q. Which of the following is the most electronegative element in the p-block?
A.
Fluorine
B.
Chlorine
C.
Oxygen
D.
Nitrogen
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Solution
Fluorine is the most electronegative element in the p-block.
Correct Answer:
A
— Fluorine
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Q. Which of the following is the simplest alkane?
A.
Methane
B.
Ethane
C.
Propane
D.
Butane
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Solution
Methane (CH4) is the simplest alkane, consisting of one carbon atom.
Correct Answer:
A
— Methane
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Q. Which of the following is the simplest alkyne?
A.
Ethylene
B.
Acetylene
C.
Propylene
D.
Butyne
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Solution
Acetylene (C2H2) is the simplest alkyne.
Correct Answer:
B
— Acetylene
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Q. Which of the following is the simplest ketone?
A.
Ethanal
B.
Propanal
C.
Butan-2-one
D.
Acetone
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Solution
Acetone (propan-2-one) is the simplest ketone, with the formula (CH3)2CO.
Correct Answer:
D
— Acetone
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Q. Which of the following is the strongest acid?
A.
Formic acid
B.
Acetic acid
C.
Propanoic acid
D.
Butanoic acid
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Solution
Formic acid (HCOOH) is stronger than acetic acid (CH3COOH) due to the presence of a hydrogen atom directly attached to the carbonyl carbon, which stabilizes the conjugate base.
Correct Answer:
A
— Formic acid
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Q. Which of the following is true about a buffer solution?
A.
Resists changes in pH
B.
Has a pH of 7
C.
Contains only strong acids
D.
Is always neutral
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Solution
A buffer solution resists changes in pH upon the addition of small amounts of acid or base.
Correct Answer:
A
— Resists changes in pH
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Q. Which of the following is true about a saturated solution?
A.
It contains more solute than can dissolve
B.
It contains less solute than can dissolve
C.
It is always at boiling point
D.
It is always at freezing point
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Solution
A saturated solution contains the maximum amount of solute that can dissolve at a given temperature.
Correct Answer:
A
— It contains more solute than can dissolve
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Q. Which of the following is true about an exothermic reaction?
A.
ΔH is positive
B.
ΔH is negative
C.
ΔH is zero
D.
ΔH can be either positive or negative
Show solution
Solution
In an exothermic reaction, the enthalpy change (ΔH) is negative because heat is released.
Correct Answer:
B
— ΔH is negative
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Q. Which of the following is true about the entropy of a system?
A.
It always decreases.
B.
It is a measure of disorder.
C.
It is independent of temperature.
D.
It can never increase.
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Solution
Entropy is a measure of disorder in a system, and it tends to increase in spontaneous processes.
Correct Answer:
B
— It is a measure of disorder.
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Q. Which of the following is true about the Freundlich adsorption isotherm?
A.
It applies only to monolayer adsorption
B.
It is applicable to heterogeneous surfaces
C.
It assumes a fixed number of adsorption sites
D.
It is a linear isotherm
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Solution
The Freundlich adsorption isotherm is applicable to heterogeneous surfaces and describes multilayer adsorption.
Correct Answer:
B
— It is applicable to heterogeneous surfaces
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Q. Which of the following is true about the Gibbs free energy change (ΔG) for a spontaneous process?
A.
ΔG > 0
B.
ΔG < 0
C.
ΔG = 0
D.
ΔG is always positive
Show solution
Solution
For a spontaneous process, the Gibbs free energy change (ΔG) is less than 0 (ΔG < 0).
Correct Answer:
B
— ΔG < 0
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Q. Which of the following is true about the Gibbs free energy change (ΔG)?
A.
ΔG < 0 indicates a spontaneous process
B.
ΔG > 0 indicates a spontaneous process
C.
ΔG = 0 indicates a non-spontaneous process
D.
ΔG is always positive
Show solution
Solution
A negative Gibbs free energy change (ΔG < 0) indicates that the process is spontaneous.
Correct Answer:
A
— ΔG < 0 indicates a spontaneous process
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Q. Which of the following is true about the heat capacity of a substance?
A.
It is always constant
B.
It depends on the amount of substance
C.
It is independent of temperature
D.
It is the same for all substances
Show solution
Solution
Heat capacity depends on the amount of substance; it is not a constant value.
Correct Answer:
B
— It depends on the amount of substance
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Q. Which of the following is true for an endothermic reaction?
A.
Heat is released
B.
ΔH is negative
C.
ΔH is positive
D.
The reaction is spontaneous
Show solution
Solution
In an endothermic reaction, heat is absorbed, resulting in a positive ΔH.
Correct Answer:
C
— ΔH is positive
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Q. Which of the following lanthanides is used in making strong permanent magnets?
A.
Cerium
B.
Neodymium
C.
Samarium
D.
Europium
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Solution
Neodymium is used in making strong permanent magnets due to its magnetic properties.
Correct Answer:
B
— Neodymium
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Q. Which of the following ligands is a strong field ligand?
A.
I-
B.
Br-
C.
CN-
D.
Cl-
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Solution
CN- is a strong field ligand and causes a large splitting of d-orbitals, leading to low-spin complexes.
Correct Answer:
C
— CN-
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Q. Which of the following liquids has the highest boiling point?
A.
Ethanol
B.
Water
C.
Benzene
D.
Hexane
Show solution
Solution
Water has a higher boiling point due to strong hydrogen bonding.
Correct Answer:
B
— Water
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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!
