Class 11 Chemistry MCQ Question with Answers

Chemistry is a subject that revolves around understanding concepts and applying them effectively. Practicing questions is one of the best ways to deepen your expertise in various areas of chemistry. This page provides comprehensive coverage of key topics, including organic, inorganic, and physical chemistry, each of which requires a unique approach to solve questions.

To help students grasp the topics thoroughly, we have compiled chapter-wise Chemistry MCQs for Class 11 along with answers. These multiple-choice questions are carefully crafted to cater to the needs of students preparing for competitive exams like NEET, AIIMS, JEE Mains, JEE Advanced, IIT JEE, and others. The questions are structured to gradually increase in difficulty, ensuring a progressive learning curve. Each chapter includes a range of questions, from basic to advanced levels, designed to strengthen understanding and problem-solving skills in chemistry.

MCQs for Class 11 Chemistry Subject-wise

Chapter-Wise MCQs for Class 11 Chemistry – Question with Answer

Chapter 1: Some Basic Concepts of Chemistry

Q1. Which of the following is a SI unit of amount of substance?
a) Mole
b) Gram
c) Kilogram
d) Atom
Answer: a) Mole

Q2. 22.4 L of a gas at STP contains:
a) 1 mole
b) 6.022 × 10²³ molecules
c) 2 moles
d) Both (a) and (b)
Answer: d) Both (a) and (b)

Q3. The empirical formula of glucose (C₆H₁₂O₆) is:
a) CH₂O
b) C₂H₄O₂
c) C₆H₁₂O₆
d) C₃H₆O₃
Answer: a) CH₂O

Chapter 2: Structure of Atom

Q4. The charge/mass ratio (e/m) of an electron was determined by:
a) Rutherford
b) J.J. Thomson
c) Millikan
d) Chadwick
Answer: b) J.J. Thomson

Q5. The quantum number that represents the shape of orbital is:
a) Principal (n)
b) Azimuthal (l)
c) Magnetic (m)
d) Spin (s)
Answer: b) Azimuthal (l)

Q6. The maximum number of electrons in an orbital is:
a) 1
b) 2
c) 4
d) 6
Answer: b) 2

Chapter 3: Classification of Elements & Periodicity

Q7. Which property generally increases across a period?
a) Atomic radius
b) Ionization energy
c) Metallic character
d) Nuclear shielding
Answer: b) Ionization energy

Q8. Who is known as the father of the periodic table?
a) Dobereiner
b) Mendeleev
c) Moseley
d) Newlands
Answer: b) Mendeleev

Chapter 4: Chemical Bonding

Q9. The bond angle in H₂O molecule is approximately:
a) 109.5°
b) 104.5°
c) 120°
d) 180°
Answer: b) 104.5°

Q10. Which type of bond is present in NaCl?
a) Covalent
b) Metallic
c) Ionic
d) Hydrogen
Answer: c) Ionic

Chapter 5: States of Matter

Q11. The pressure exerted by gas molecules on container walls is due to:
a) Vibration
b) Collision
c) Rotation
d) Attraction
Answer: b) Collision

Q12. Boyle’s law relates:
a) Pressure and temperature
b) Pressure and volume
c) Volume and temperature
d) Mass and volume
Answer: b) Pressure and volume

Chapter 6: Thermodynamics

Q13. The SI unit of enthalpy is:
a) Calorie
b) Joule
c) Erg
d) Watt
Answer: b) Joule

Q14. ΔG = ΔH – TΔS represents:
a) First law
b) Hess’s law
c) Gibbs free energy equation
d) Zeroth law
Answer: c) Gibbs free energy equation

Chapter 7: Equilibrium

Q15. The pH of neutral solution at 25°C is:
a) 1
b) 7
c) 10
d) 14
Answer: b) 7

Q16. Common ion effect is observed in:
a) Solubility product
b) Electrolysis
c) Redox reactions
d) Neutralization
Answer: a) Solubility product

Chapter 8: Redox Reactions

Q17. Oxidation is defined as:
a) Loss of electrons
b) Gain of electrons
c) Gain of protons
d) Loss of neutrons
Answer: a) Loss of electrons

Q18. The oxidizing agent is the species that:
a) Gets oxidized
b) Gets reduced
c) Loses electrons
d) Neutralizes
Answer: b) Gets reduced

Chapter 9: The Hydrogen Element

Q19. Heavy water is:
a) H₂O
b) D₂O
c) T₂O
d) H₃O⁺
Answer: b) D₂O

Q20. Hydrogen is placed in group 1 of periodic table because:
a) It forms +1 ion
b) It is a metal
c) It is a non-metal
d) It resembles halogens
Answer: a) It forms +1 ion

Chapter 10: The s-Block Element

Q21. Which alkali metal is liquid at room temperature?
a) Sodium
b) Potassium
c) Cesium
d) None
Answer: d) None

Q22. Plaster of Paris is chemically:
a) CaSO₄·½H₂O
b) CaSO₄·2H₂O
c) CaO
d) Ca(OH)₂
Answer: a) CaSO₄·½H₂O

Chapter 11: The p-Block Element

Q23. Allotropes of carbon include:
a) Diamond
b) Graphite
c) Fullerenes
d) All of these
Answer: d) All of these

Q24. Nitrogen molecule (N₂) has a bond order of:
a) 1
b) 2
c) 3
d) 4
Answer: c) 3

Chapter 12: Organic Chemistry – Basic Principles

Q25. The functional group in alcohol is:
a) –CHO
b) –OH
c) –COOH
d) –NH₂
Answer: b) –OH

Q26. IUPAC name of CH₃–CH₂–CH₃ is:
a) Propane
b) Ethane
c) Butane
d) Methane
Answer: a) Propane

Chapter 13: Hydrocarbons

Q27. Benzene is:
a) Alkane
b) Alkene
c) Alkyne
d) Aromatic compound
Answer: d) Aromatic compound

Q28. Alkyne with molecular formula C₂H₂ is:
a) Ethane
b) Ethene
c) Ethyne
d) Methyne
Answer: c) Ethyne

Chapter 14: Environmental Chemistry

Q29. Ozone layer is present in:
a) Troposphere
b) Stratosphere
c) Mesosphere
d) Ionosphere
Answer: b) Stratosphere

Q30. Major greenhouse gas is:
a) CO₂
b) O₂
c) N₂
d) H₂
Answer: a) CO₂