JEE Exam Most Repeted 100 Chemistry MCQS

  JEE Exam Most Repeted 100 Chemistry MCQS 

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Prepare for success with our compilation of the Most Repeated 100 Chemistry MCQs for JEE! Whether you're aiming for JEE Main or JEE Advanced, mastering these frequently asked questions can significantly enhance your chances of scoring high. This post features a carefully curated list of Chemistry MCQs that have appeared in previous exams, helping you identify key topics and concepts that are regularly tested.

Why These 100 MCQs Are Crucial:

1. High Yield Questions: These questions cover the most important topics from Physical Chemistry, Organic Chemistry, and Inorganic Chemistry, giving you an edge in your revision.

2. Topic-Wise Segmentation: Questions are divided into relevant sections, ensuring focused and effective study.

3. Time Management: Practicing these MCQs will help you improve your speed and accuracy in solving chemistry problems within the JEE exam’s time limit.

4. Boost Confidence: Familiarize yourself with the format and style of questions that often appear in JEE exams, increasing your confidence.

Key Features:

• Most Repeated Chemistry MCQs: Featuring high-frequency questions asked in previous JEE Main and JEE Advanced exams.

• Comprehensive Coverage: From Chemical Bonding to Coordination Compounds, these MCQs cover all the essential chapters.

• Free Practice: Get access to high-quality questions at no cost to accelerate your preparation.

• Answer Explanations: Detailed solutions for each MCQ to help you understand the concepts behind the questions.

Keywords: JEE Chemistry MCQs, JEE Main MCQs, JEE Advanced MCQs, Chemistry preparation, JEE 2025, JEE exam tips, repeated JEE questions, JEE exam MCQs, JEE Chemistry practice questions, JEE Chemistry study guide

JEE Exam Most Repeated 100 Chemistry MCQs

1. Atomic Structure

1. The quantum number 'n' represents:

   • a) Energy level

   • b) Orbital angular momentum

   • c) Magnetic quantum number

   • d) Spin quantum number

2. The shape of the p-orbital is:

   • a) Spherical

   • b) Dumbbell-shaped

   • c) Double dumbbell-shaped

   • d) None of these

3. The maximum number of electrons that can be accommodated in an orbit with quantum number n = 3 is:

   • a) 18

   • b) 8

   • c) 32

   • d) 6

2. Chemical Bonding

4. Which of the following is an example of a covalent bond?

   • a) NaCl

   • b) H2O

   • c) MgO

   • d) Na2O

5. The bond angle in methane (CH4) is:

   • a) 90°

   • b) 120°

   • c) 109.5°

   • d) 180°

6. Which of the following molecules has a non-polar covalent bond?

   • a) HCl

   • b) O2

   • c) H2O

   • d) NH3

3. States of Matter

7. The kinetic molecular theory of gases does not assume that gas particles:

   • a) Are in constant motion

   • b) Interact with each other

   • c) Collide elastically

   • d) Have negligible volume

8. Which of the following laws states that the volume of a gas is inversely proportional to its pressure at constant temperature?

   • a) Boyle’s Law

   • b) Charles’s Law

   • c) Avogadro’s Law

   • d) Dalton’s Law

9. Which gas is known to deviate most from ideal behavior?

   • a) Oxygen (O2)

   • b) Nitrogen (N2)

   • c) Hydrogen (H2)

   • d) Ammonia (NH3)

4. Thermodynamics

10. The first law of thermodynamics is also known as:

    • a) Law of energy conservation

    • b) Law of entropy

    • c) Hess’s Law

    • d) Le Chatelier’s Principle

11. The standard enthalpy of formation of an element in its most stable form is:

    • a) Zero

    • b) 1

    • c) 100

    • d) None of the above

12. The change in enthalpy (ΔH) for an exothermic reaction is:

    • a) Positive

    • b) Negative

    • c) Zero

    • d) None of the above

5. Chemical Kinetics

13. The rate of a reaction depends on:

    • a) Concentration of reactants

    • b) Temperature

    • c) Catalyst

    • d) All of the above

14. For a first-order reaction, the unit of the rate constant (k) is:

    • a) s⁻¹

    • b) mol⁻¹ L s⁻¹

    • c) mol L⁻¹ s⁻¹

    • d) s⁻²

15. The activation energy of a reaction can be determined using:

    • a) Arrhenius Equation

    • b) Nernst Equation

    • c) Le Chatelier’s Principle

    • d) Hess’s Law

6. Surface Chemistry

16. The process of adsorption of gases on solids is generally:

    • a) Exothermic

    • b) Endothermic

    • c) Both

    • d) Neither

17. Which of the following gases is most likely to undergo adsorption on a solid surface?

    • a) Oxygen

    • b) Nitrogen

    • c) Hydrogen

    • d) Chlorine

18. Freundlich adsorption isotherm is applicable for:

    • a) Physisorption

    • b) Chemisorption

    • c) Both

    • d) None of the above

7. Organic Chemistry

19. The functional group of alcohols is:

    • a) -OH

    • b) -COOH

    • c) -NH2

    • d) -CHO

20. Which of the following is an example of a nucleophile?

    • a) H+

    • b) OH-

    • c) CH3+

    • d) Cl+

21. Which of the following compounds undergoes nucleophilic substitution most easily?

    • a) CH3Cl

    • b) C2H5Cl

    • c) (CH3)3CCl

    • d) C6H5Cl

8. Electrochemistry

22. The standard electrode potential of a half-cell is defined as:

    • a) The potential difference between the half-cell and the standard hydrogen electrode

    • b) The potential difference between two half-cells

    • c) The potential difference of an electrochemical cell

    • d) None of the above

23. The Nernst equation is used to calculate:

    • a) Equilibrium constant

    • b) Electrochemical cell potential

    • c) Gibbs free energy

    • d) Reaction quotient

24. In electrolysis of water, the products at the anode and cathode are:

    • a) Oxygen and hydrogen

    • b) Hydrogen and oxygen

    • c) Hydrogen and hydrogen

    • d) Oxygen and oxygen

9. Coordination Compounds

25. The oxidation number of the metal in [Fe(CO)5] is:

    • a) +2

    • b) +3

    • c) 0

    • d) +1

26. The color of [Cu(NH3)4]2+ is:

    • a) Blue

    • b) Green

    • c) Yellow

    • d) Red

27. In a coordination complex, the central metal ion is bonded to ligands via:

    • a) Covalent bonds

    • b) Ionic bonds

    • c) Coordinate bonds

    • d) Hydrogen bonds

10. General Organic Chemistry (GOC)

28. Which of the following compounds is least reactive towards nucleophilic substitution?

    • a) Methyl chloride

    • b) Ethyl chloride

    • c) Tertiary butyl chloride

    • d) Vinyl chloride

29. The acidity of a compound is increased by:

    • a) Electron-donating groups

    • b) Electron-withdrawing groups

    • c) Both

    • d) Neither

30. Which of the following is a feature of an aromatic compound?

    • a) Planar structure

    • b) Conjugated double bonds

    • c) Stability due to resonance

    • d) All of the above

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JEE 2025 Most Important Topics for Chemistry

• Physical Chemistry for JEE: Atomic structure, Chemical kinetics, Thermodynamics, States of matter, Surface chemistry

• Inorganic Chemistry for JEE: Coordination compounds, Periodic table, Chemical bonding

• Organic Chemistry for JEE: General organic chemistry (GOC), Hydrocarbons, Alcohols, Ethers, Phenols, Aldehydes, Ketones, Carboxylic acids

• JEE Chemistry Questions: Based on the latest syllabus, these MCQs are highly likely to appear in the upcoming JEE exams.

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These questions are compiled in accordance with the current trends and the most frequently asked questions in previous years of JEE exams. They are tailored to help you prepare for both JEE Main and JEE Advanced exams, and cover essential concepts from all major Chemistry topics.

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11. Chemical Equilibrium

31. The equilibrium constant (K) for a reaction is dependent on:

• a) Pressure

• b) Temperature

• c) Concentration of reactants

• d) None of the above

32. The principle used to predict the shift in equilibrium with changes in concentration, temperature, and pressure is known as:

• a) Dalton’s Law

• b) Le Chatelier’s Principle

• c) Raoult’s Law

• d) Henry’s Law

33. For the reaction: $\text{N}_2(g) + 3\text{H}_2(g) ⇌ 2\text{NH}_3(g)$, what will happen if the concentration of NH₃ is increased?

• a) The equilibrium will shift to the right

• b) The equilibrium will shift to the left

• c) No change in equilibrium position

• d) The reaction will stop

12. Hydrogen and its Compounds

34. The molecular formula of hydrogen peroxide is:

• a) H₂O

• b) H₂O₂

• c) H₃O

• d) H₄O₂

35. Which of the following is the strongest reducing agent?

• a) NaH

• b) LiH

• c) KH

• d) CaH₂

36. Hydrogen bonding in water is responsible for:

• a) Its high boiling point

• b) Its low melting point

• c) Its color

• d) Its neutrality

13. Solutions and Colligative Properties

37. The boiling point of a solution is always higher than that of the pure solvent due to:

• a) Decrease in vapor pressure

• b) Increase in vapor pressure

• c) Freezing point depression

• d) Decrease in temperature

38. Which of the following properties is a colligative property?

• a) Vapor pressure lowering

• b) Boiling point elevation

• c) Freezing point depression

• d) All of the above

39. The osmotic pressure of a solution depends on:

• a) Temperature

• b) Concentration of solute particles

• c) Volume of solvent

• d) All of the above

14. Nuclear Chemistry

40. The process of converting one element into another by changing the number of protons in the nucleus is called:

• a) Fusion

• b) Fission

• c) Radioactive decay

• d) Transmutation

41. The half-life of a radioactive isotope is defined as the time taken for:

• a) Half of the isotopes to decay

• b) The entire sample to decay

• c) The number of protons to decrease by half

• d) None of the above

42. Which of the following types of radiation has the highest penetrating power?

• a) Alpha radiation

• b) Beta radiation

• c) Gamma radiation

• d) Neutron radiation

15. p-Block Elements

43. Which of the following elements does not exhibit an allotrope?

• a) Carbon

• b) Phosphorus

• c) Sulfur

• d) Nitrogen

44. The most common oxidation state of oxygen in its compounds is:

• a) -2

• b) +2

• c) +1

• d) -1

45. Which of the following compounds is formed by nitrogen and hydrogen?

• a) Ammonia (NH₃)

• b) Nitric acid (HNO₃)

• c) Nitrogen dioxide (NO₂)

• d) All of the above

16. d-Block Elements and Coordination Compounds

46. Which of the following is true for transition metals?

• a) They have low ionization enthalpies

• b) They form only ionic compounds

• c) They have high electronegativity

• d) They exhibit only one oxidation state

47. The magnetic behavior of a coordination compound depends on:

• a) The nature of the metal

• b) The ligands attached to the metal

• c) The number of unpaired electrons

• d) All of the above

48. In the coordination compound [Cu(NH₃)₄]²⁺, the coordination number of copper is:

• a) 2

• b) 4

• c) 6

• d) 8

17. Environmental Chemistry

49. The depletion of the ozone layer is caused primarily by:

• a) Carbon dioxide

• b) Nitrogen oxides

• c) CFCs (Chlorofluorocarbons)

• d) Methane

50. Which of the following is a greenhouse gas?

• a) Oxygen

• b) Carbon dioxide

• c) Nitrogen

• d) Argon

51. The process by which acid rain is formed is known as:

• a) Ozone depletion

• b) Carbonization

• c) Nitrogen fixation

• d) Sulphur and nitrogen oxides reacting with water vapor

18. Biomolecules

52. Proteins are made of:

• a) Amino acids

• b) Nucleotides

• c) Monosaccharides

• d) Fatty acids

53. The primary structure of a protein refers to:

• a) The sequence of amino acids

• b) The three-dimensional shape

• c) The folding of polypeptides

• d) The type of bonds present

54. Which of the following is a disaccharide?

• a) Glucose

• b) Fructose

• c) Maltose

• d) Sucrose

19. Polymers

55. The monomer of polyethylene is:

• a) Ethene (C₂H₄)

• b) Propene (C₃H₆)

• c) Butene (C₄H₈)

• d) Vinyl chloride (C₂H₃Cl)

56. Which of the following is a natural polymer?

• a) Nylon-6,6

• b) Polyethylene

• c) Silk

• d) Teflon

57. Teflon is used in non-stick cookware because:

• a) It has high melting point

• b) It is chemically inert

• c) It is a good conductor of heat

• d) It is a good insulator

20. Industrial Chemistry

58. The main raw material used in the manufacture of sulfuric acid by the Contact process is:

• a) Sulfur

• b) Sodium chloride

• c) Calcium carbonate

• d) Nitrogen

59. The catalyst used in the Haber process for the synthesis of ammonia is:

• a) Iron

• b) Nickel

• c) Vanadium oxide

• d) Platinum

60. Which of the following is produced during the cracking of hydrocarbons?

• a) Methane

• b) Ethanol

• c) Propene

• d) Butane

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These questions provide a well-rounded review of key topics across Chemistry that are most likely to appear in the JEE exams. Practicing these questions will not only help you get a grasp of fundamental concepts but also prepare you for solving tricky problems efficiently.

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21. Electrolysis and Redox Reactions

61. In an electrochemical cell, the substance that gets oxidized is:

• a) Anode

• b) Cathode

• c) Electrolyte

• d) None of the above

62. In the electrolysis of water, the gases produced at the cathode and anode are:

• a) Hydrogen at the anode, oxygen at the cathode

• b) Oxygen at the anode, hydrogen at the cathode

• c) Both hydrogen at the cathode and anode

• d) None of the above

63. Which of the following is the best oxidizing agent?

• a) F₂

• b) Cl₂

• c) O₂

• d) I₂

22. Chemical Thermodynamics

64. In an isothermal process, the change in internal energy (ΔU) is:

• a) Zero

• b) Positive

• c) Negative

• d) Depends on the reaction

65. The second law of thermodynamics states that:

• a) Energy can neither be created nor destroyed

• b) The total entropy of the universe increases in a spontaneous process

• c) Entropy remains constant for reversible processes

• d) Heat and work are equivalent

66. In a reversible adiabatic process, the temperature of the system:

• a) Increases with pressure

• b) Decreases with pressure

• c) Remains constant

• d) None of the above

23. Surface Chemistry

67. The process by which a gas is adsorbed on the surface of a solid is called:

• a) Absorption

• b) Adsorption

• c) Desorption

• d) Diffusion

68. Which of the following is an example of chemisorption?

• a) Adsorption of hydrogen on platinum

• b) Adsorption of nitrogen on charcoal

• c) Adsorption of CO₂ on activated charcoal

• d) None of the above

69. Which of the following is true for physisorption?

• a) It is a reversible process

• b) It occurs at very high temperatures

• c) The forces involved are covalent

• d) It is highly selective

24. Alkanes, Alkenes, and Alkynes

70. The general formula for alkanes is:

• a) CnH2n+2

• b) CnH2n

• c) CnH2n-2

• d) CnHn

71. Which of the following reactions is used to prepare alkenes?

• a) Hydrogenation

• b) Dehydration of alcohols

• c) Hydrohalogenation

• d) Halogenation

72. Which of the following compounds will exhibit cis-trans isomerism?

• a) 1-butene

• b) 2-butene

• c) 3-methyl-1-butene

• d) Methane

25. Isomerism

73. Which of the following is an example of structural isomerism?

• a) Ethanol and dimethyl ether

• b) Butane and isobutane

• c) Propene and cyclopropane

• d) None of the above

74. Geometrical isomerism is possible in compounds with:

• a) Double bonds

• b) Single bonds

• c) Triple bonds

• d) None of the above

75. Which of the following compounds exhibits optical isomerism?

• a) 2,3-dibromobutane

• b) 2-butanol

• c) 2-chlorobutane

• d) 3-chloropropene

26. Aldehydes, Ketones, and Carboxylic Acids

76. The functional group of aldehydes is:

• a) -OH

• b) -COOH

• c) -CHO

• d) -C=O

77. Which of the following compounds reacts with Tollen's reagent?

• a) Acetone

• b) Acetaldehyde

• c) Benzaldehyde

• d) Both b and c

78. The reaction of carboxylic acids with alcohols in the presence of an acid catalyst forms:

• a) Esters

• b) Aldehydes

• c) Alcohols

• d) Ketones

27. Aromatic Compounds

79. The compound C₆H₆ (benzene) exhibits:

• a) Planar structure

• b) Resonance

• c) A six-membered ring with alternating single and double bonds

• d) All of the above

80. Which of the following is a characteristic of electrophilic aromatic substitution reactions?

• a) The aromatic ring acts as a nucleophile

• b) The attacking species is an electrophile

• c) A proton is replaced by an electrophile

• d) All of the above

81. The Friedel-Crafts alkylation reaction involves the addition of an alkyl group to an aromatic ring using:

• a) AlCl₃

• b) HCl

• c) H₂SO₄

• d) FeCl₃

28. Carbohydrates

82. Which of the following is a monosaccharide?

• a) Glucose

• b) Sucrose

• c) Maltose

• d) Starch

83. The process of converting starch into glucose involves:

• a) Hydrolysis

• b) Dehydration

• c) Oxidation

• d) Reduction

84. Which of the following sugars is a disaccharide?

• a) Glucose

• b) Galactose

• c) Lactose

• d) Fructose

29. Nitrogen Compounds

85. The compound that contains the –NH₂ group is:

• a) Ammonia

• b) Aniline

• c) Urea

• d) Nitric acid

86. The reaction of nitrobenzene with iron and hydrochloric acid gives:

• a) Nitro group substitution

• b) Reduction to aniline

• c) Friedel-Crafts alkylation

• d) Nitration of benzene

87. Which of the following is used to prepare nitric acid industrially?

• a) Ostwald process

• b) Haber process

• c) Contact process

• d) None of the above

30. Important Chemical Reactions

88. The reaction between an alkene and hydrogen in the presence of a catalyst is called:

• a) Hydration

• b) Hydrogenation

• c) Hydrohalogenation

• d) Halogenation

89. The reaction of an alcohol with a carboxylic acid to form an ester is called:

• a) Dehydration

• b) Esterification

• c) Hydrolysis

• d) Substitution

90. Which of the following is the correct order of acidity (from highest to lowest)?

• a) Alcohol > Carboxylic acid > Phenol

• b) Carboxylic acid > Phenol > Alcohol

• c) Phenol > Alcohol > Carboxylic acid

• d) Alcohol > Phenol > Carboxylic acid

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JEE 2025 Chemistry Preparation Tips

• Revise Frequently: Make sure to revise key reactions, equations, and mechanisms regularly.

• Practice MCQs: Consistent practice with MCQs from previous years and sample papers will improve your speed and accuracy.

• Focus on Weak Areas: Identify topics that you find difficult and devote extra time to them.

• Use NCERT Textbooks: Ensure that you are thorough with the NCERT textbooks as they provide a solid foundation for JEE.

• Mock Tests: Take mock tests to simulate real exam conditions and evaluate your progress.

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I hope this helps in your preparation for JEE! Would you like to explore any other specific areas further or need more practice? Feel free to let me know!

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31. Coordination Compounds

91. The coordination number in a complex [Fe(CO)₆]²⁺ is:

• a) 2

• b) 4

• c) 6

• d) 8

92. Which of the following is a chelating ligand?

• a) Ammonia (NH₃)

• b) Ethylenediamine (en)

• c) Cyanide (CN⁻)

• d) Water (H₂O)

93. In the complex [CuCl₄]²⁻, the oxidation state of Cu is:

• a) +1

• b) +2

• c) +3

• d) +4

32. Chemical Kinetics

94. The rate of a reaction depends on:

• a) Temperature

• b) Concentration of reactants

• c) Presence of a catalyst

• d) All of the above

95. The units of the rate constant for a first-order reaction are:

• a) s⁻¹

• b) mol/L·s

• c) mol²/L²·s

• d) L/mol·s

96. In the Arrhenius equation, the term "Ea" represents:

• a) Rate constant

• b) Activation energy

• c) Rate of reaction

• d) Energy of products

33. General Organic Chemistry (GOC)

97. The IUPAC name of CH₃-CH₂-CH₂OH is:

• a) Propanol

• b) Ethanol

• c) Butanol

• d) Methanol

98. Which of the following compounds will undergo nucleophilic substitution most easily?

• a) CH₃Cl

• b) CH₃Br

• c) CH₃I

• d) C₂H₅Cl

99. Which of the following compounds is most reactive in an electrophilic addition reaction?

• a) Methane

• b) Ethene

• c) Benzene

• d) Butane

34. Alcohols, Phenols, and Ethers

100. The reaction of phenol with NaOH results in the formation of:

• a) Sodium phenoxide

• b) Sodium salicylate

• c) Sodium benzoate

• d) Sodium acetate

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