CBSE Class 11 Structure of Atom MCQs – Question with Answers
- Bohr’s Atomic Model
- Quantum Mechanical Model
- Electromagnetic Radiation & Spectra
- Heisenberg & de Broglie
- General Atomic Structure
FAQs on Class 11 Chemistry Chapter 2 MCQs

Class 11 Chemistry Chapter 2 Structure of Atom MCQs with Answers

By Swati Singh

Updated on 22 Aug 2025, 16:45 IST

MCQs on Class 11 Structure of Atom: CBSE Class 11 students should be familiar with the new exam pattern where 50% of the questions are in MCQ format. The board has increased the importance of multiple-choice questions as they test students’ problem-solving and critical thinking abilities. It’s important for students to practice different types of questions to understand what might appear in the exam. In this article, you will find MCQs for CBSE Class 11 Chemistry Chapter 2, Structure of Atom. The questions are created by subject experts and cover key concepts from the chapter. These MCQs are perfect for preparing for the 2025-26 exams. You can read and download all the questions and answers in PDF from the link provided at the end of the article.

CBSE Class 11 Structure of Atom MCQs – Question with Answers

Who proposed the nuclear model of the atom?
a) J.J. Thomson
b) Rutherford
c) Niels Bohr
d) Dalton
Answer: b) Rutherford
The charge of an electron was determined by:
a) Rutherford experiment
b) Millikan’s oil drop experiment
c) Bohr’s theory
d) J.J. Thomson experiment
Answer: b) Millikan’s oil drop experiment
Which particle was discovered by J.J. Thomson?
a) Proton
b) Electron
c) Neutron
d) Positron
Answer: b) Electron
Which subatomic particle has no charge?
a) Proton
b) Electron
c) Neutron
d) Positron
Answer: c) Neutron
Who discovered the neutron?
a) Rutherford
b) Chadwick
c) Goldstein
d) Bohr
Answer: b) Chadwick
Which of the following is not a fundamental particle of an atom?
a) Proton
b) Neutron
c) Photon
d) Electron
Answer: c) Photon
Cathode rays are streams of:
a) Protons
b) Neutrons
c) Electrons
d) α-particles
Answer: c) Electrons
The charge of a proton is:
a) Equal but opposite to that of an electron
b) Twice that of electron
c) Neutral
d) 1.67 × 10^-24 C
Answer: a) Equal but opposite to that of an electron
The mass number is the sum of:
a) Protons only
b) Electrons + Neutrons
c) Protons + Neutrons
d) Electrons + Protons
Answer: c) Protons + Neutrons

Bohr’s Atomic Model

Bohr’s model of atom is based on:
a) Uncertainty principle
b) Stationary orbits of electrons
c) Dual nature of matter
d) Nuclear fission
Answer: b) Stationary orbits of electrons
Energy is emitted or absorbed when an electron:
a) Rotates in same orbit
b) Jumps between two orbits
c) Is at rest
d) Becomes neutral
Answer: b) Jumps between two orbits
The angular momentum of an electron in Bohr’s orbit is quantized as:
a) nh
b) nh/2π
c) n^2h/2π
d) n/2π
Answer: b) nh/2π
The radius of the first Bohr orbit of hydrogen is:
a) 0.529 Å
b) 1 Å
c) 5.29 Å
d) 0.152 Å
Answer: a) 0.529 Å
Which quantum number determines the size of an orbital?
a) Principal quantum number (n)
b) Azimuthal quantum number (l)
c) Magnetic quantum number (m)
d) Spin quantum number (s)
Answer: a) Principal quantum number (n)

Quantum Mechanical Model

Quantum mechanical model of atom was proposed by:
a) Bohr
b) Heisenberg
c) Schrodinger
d) Dalton
Answer: c) Schrodinger
Which principle states that two electrons cannot have the same set of quantum numbers?
a) Hund’s Rule
b) Pauli’s Exclusion Principle
c) Aufbau Principle
d) Bohr’s Theory
Answer: b) Pauli’s Exclusion Principle
The shape of s-orbital is:
a) Spherical
b) Dumb-bell
c) Double dumb-bell
d) Diffused
Answer: a) Spherical
The maximum number of electrons in an orbital is:
a) 1
b) 2
c) 4
d) 6
Answer: b) 2
The number of orbitals in a shell is given by:
a) 2n
b) n^2
c) 2n^2
d) n(n+1)
Answer: b) n^2

Electromagnetic Radiation & Spectra

Energy of a photon is given by:
a) E = mc^2
b) E = hν
c) E = hv/c
d) E = h/ν
Answer: b) E = hν
Which experiment confirmed the dual nature of electron?
a) Davisson-Germer experiment
b) Rutherford experiment
c) Millikan’s experiment
d) Thomson experiment
Answer: a) Davisson-Germer experiment
The line spectrum of hydrogen atom was explained by:
a) Dalton
b) Bohr
c) Rutherford
d) Schrodinger
Answer: b) Bohr
The Balmer series of hydrogen atom lies in the:
a) UV region
b) Visible region
c) Infrared region
d) Microwave region
Answer: b) Visible region
The Lyman series appears in the:
a) UV region
b) Visible region
c) Infrared region
d) X-ray region
Answer: a) UV region

Heisenberg & de Broglie

According to Heisenberg’s Uncertainty principle, it is impossible to determine simultaneously:
a) Position only
b) Momentum only
c) Both position and momentum
d) Mass and energy
Answer: c) Both position and momentum
The wavelength associated with moving particle is given by:
a) Planck’s equation
b) Einstein’s relation
c) de Broglie equation
d) Bohr’s formula
Answer: c) de Broglie equation
de Broglie wavelength formula is:
a) λ = h/mv
b) λ = hν
c) λ = mc^2/h
d) λ = h/p^2
Answer: a) λ = h/mv
Wave nature of electron was confirmed by:
a) Davisson and Germer experiment
b) Rutherford scattering
c) Millikan oil drop
d) Bohr’s theory
Answer: a) Davisson and Germer experiment
Dual nature of matter was proposed by:
a) Bohr
b) Einstein
c) de Broglie
d) Heisenberg
Answer: c) de Broglie

General Atomic Structure

Isotopes have same:
a) Atomic number
b) Mass number
c) Number of neutrons
d) Mass and charge
Answer: a) Atomic number
Isobars are atoms with same:
a) Atomic number
b) Mass number
c) Neutrons
d) Protons
Answer: b) Mass number
The atomic number is equal to:
a) Number of protons
b) Number of neutrons
c) Protons + Neutrons
d) Protons + Electrons
Answer: a) Number of protons
The nucleus of atom consists of:
a) Protons and neutrons
b) Electrons only
c) Protons only
d) Neutrons only
Answer: a) Protons and neutrons
The maximum number of electrons in M shell is:
a) 2
b) 8
c) 18
d) 32
Answer: c) 18
The maximum number of electrons in L shell is:
a) 2
b) 8
c) 18
d) 32
Answer: b) 8
The capacity of K shell is:
a) 2
b) 8
c) 18
d) 32
Answer: a) 2
The maximum number of electrons in a shell is given by:
a) n^2
b) 2n^2
c) n+1
d) 2n
Answer: b) 2n^2
Azimuthal quantum number (l) indicates:
a) Size of orbital
b) Shape of orbital
c) Orientation of orbital
d) Spin of electron
Answer: b) Shape of orbital
Magnetic quantum number (m) describes:
a) Orientation of orbital
b) Energy of orbital
c) Size of orbital
d) Shape of orbital
Answer: a) Orientation of orbital
The spin quantum number (s) has values:
a) +1 and -1
b) +½ and -½
c) 0 and 1
d) n and l
Answer: b) +½ and -½
The total number of orbitals in a d-subshell is:
a) 3
b) 5
c) 7
d) 9
Answer: b) 5
The total number of orbitals in an f-subshell is:
a) 3
b) 5
c) 7
d) 9
Answer: c) 7
The electron capacity of f-subshell is:
a) 7
b) 14
c) 10
d) 6
Answer: b) 14
The electron configuration of oxygen (Z=8) is:
a) 1s² 2s² 2p⁴
b) 1s² 2s² 2p⁶
c) 1s² 2s² 2p³
d) 1s² 2s² 2p⁵
Answer: a) 1s² 2s² 2p⁴

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FAQs on Class 11 Chemistry Chapter 2 MCQs

Why should I practice MCQs for Chapter 2 (Structure of Atom)?

Practicing MCQs helps strengthen your understanding of concepts, improves speed and accuracy, and prepares you for competitive exams like NEET, JEE, and CUET.

What type of MCQs are usually asked from this chapter?

Concept-based, formula-based, numerical-based, and reasoning-type MCQs (like identifying isotopes, quantum numbers, Bohr’s model, de Broglie wavelength, etc.).

Are numerical-based MCQs asked from this chapter?

Yes, especially on topics like de Broglie wavelength, energy of photon, Bohr’s orbit radius, and frequency/wavelength conversions.

Which topics from Chapter 2 are most important for MCQs?

Discovery of subatomic particles (electron, proton, neutron)
Rutherford’s and Bohr’s atomic models
Quantum mechanical model of atom
Quantum numbers & orbitals
Heisenberg Uncertainty Principle
de Broglie relation & Davisson-Germer experiment
Electronic configuration rules (Aufbau, Pauli, Hund)
Spectral series of hydrogen atom

CBSE Class 11 Structure of Atom MCQs – Question with Answers

Who proposed the nuclear model of the atom?
a) J.J. Thomson
b) Rutherford
c) Niels Bohr
d) Dalton
Answer: b) Rutherford

The charge of an electron was determined by:
a) Rutherford experiment
b) Millikan’s oil drop experiment
c) Bohr’s theory
d) J.J. Thomson experiment
Answer: b) Millikan’s oil drop experiment

Which particle was discovered by J.J. Thomson?
a) Proton
b) Electron
c) Neutron
d) Positron
Answer: b) Electron

Which subatomic particle has no charge?
a) Proton
b) Electron
c) Neutron
d) Positron
Answer: c) Neutron

Who discovered the neutron?
a) Rutherford
b) Chadwick
c) Goldstein
d) Bohr
Answer: b) Chadwick

Which of the following is not a fundamental particle of an atom?
a) Proton
b) Neutron
c) Photon
d) Electron
Answer: c) Photon

Cathode rays are streams of:
a) Protons
b) Neutrons
c) Electrons
d) α-particles
Answer: c) Electrons

The charge of a proton is:
a) Equal but opposite to that of an electron
b) Twice that of electron
c) Neutral
d) 1.67 × 10^-24 C
Answer: a) Equal but opposite to that of an electron

The mass number is the sum of:
a) Protons only
b) Electrons + Neutrons
c) Protons + Neutrons
d) Electrons + Protons
Answer: c) Protons + Neutrons

Bohr’s Atomic Model

Bohr’s model of atom is based on:
a) Uncertainty principle
b) Stationary orbits of electrons
c) Dual nature of matter
d) Nuclear fission
Answer: b) Stationary orbits of electrons

Energy is emitted or absorbed when an electron:
a) Rotates in same orbit
b) Jumps between two orbits
c) Is at rest
d) Becomes neutral
Answer: b) Jumps between two orbits

The angular momentum of an electron in Bohr’s orbit is quantized as:
a) nh
b) nh/2π
c) n^2h/2π
d) n/2π
Answer: b) nh/2π

The radius of the first Bohr orbit of hydrogen is:
a) 0.529 Å
b) 1 Å
c) 5.29 Å
d) 0.152 Å
Answer: a) 0.529 Å

Which quantum number determines the size of an orbital?
a) Principal quantum number (n)
b) Azimuthal quantum number (l)
c) Magnetic quantum number (m)
d) Spin quantum number (s)
Answer: a) Principal quantum number (n)

Quantum Mechanical Model

Quantum mechanical model of atom was proposed by:
a) Bohr
b) Heisenberg
c) Schrodinger
d) Dalton
Answer: c) Schrodinger

Which principle states that two electrons cannot have the same set of quantum numbers?
a) Hund’s Rule
b) Pauli’s Exclusion Principle
c) Aufbau Principle
d) Bohr’s Theory
Answer: b) Pauli’s Exclusion Principle

The shape of s-orbital is:
a) Spherical
b) Dumb-bell
c) Double dumb-bell
d) Diffused
Answer: a) Spherical

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

The number of orbitals in a shell is given by:
a) 2n
b) n^2
c) 2n^2
d) n(n+1)
Answer: b) n^2

Electromagnetic Radiation & Spectra

Energy of a photon is given by:
a) E = mc^2
b) E = hν
c) E = hv/c
d) E = h/ν
Answer: b) E = hν

Which experiment confirmed the dual nature of electron?
a) Davisson-Germer experiment
b) Rutherford experiment
c) Millikan’s experiment
d) Thomson experiment
Answer: a) Davisson-Germer experiment

The line spectrum of hydrogen atom was explained by:
a) Dalton
b) Bohr
c) Rutherford
d) Schrodinger
Answer: b) Bohr

The Balmer series of hydrogen atom lies in the:
a) UV region
b) Visible region
c) Infrared region
d) Microwave region
Answer: b) Visible region

The Lyman series appears in the:
a) UV region
b) Visible region
c) Infrared region
d) X-ray region
Answer: a) UV region

Heisenberg & de Broglie

According to Heisenberg’s Uncertainty principle, it is impossible to determine simultaneously:
a) Position only
b) Momentum only
c) Both position and momentum
d) Mass and energy
Answer: c) Both position and momentum

The wavelength associated with moving particle is given by:
a) Planck’s equation
b) Einstein’s relation
c) de Broglie equation
d) Bohr’s formula
Answer: c) de Broglie equation

de Broglie wavelength formula is:
a) λ = h/mv
b) λ = hν
c) λ = mc^2/h
d) λ = h/p^2
Answer: a) λ = h/mv

Wave nature of electron was confirmed by:
a) Davisson and Germer experiment
b) Rutherford scattering
c) Millikan oil drop
d) Bohr’s theory
Answer: a) Davisson and Germer experiment

Dual nature of matter was proposed by:
a) Bohr
b) Einstein
c) de Broglie
d) Heisenberg
Answer: c) de Broglie

General Atomic Structure

Isotopes have same:
a) Atomic number
b) Mass number
c) Number of neutrons
d) Mass and charge
Answer: a) Atomic number

Isobars are atoms with same:
a) Atomic number
b) Mass number
c) Neutrons
d) Protons
Answer: b) Mass number

The atomic number is equal to:
a) Number of protons
b) Number of neutrons
c) Protons + Neutrons
d) Protons + Electrons
Answer: a) Number of protons

The nucleus of atom consists of:
a) Protons and neutrons
b) Electrons only
c) Protons only
d) Neutrons only
Answer: a) Protons and neutrons

The maximum number of electrons in M shell is:
a) 2
b) 8
c) 18
d) 32
Answer: c) 18

The maximum number of electrons in L shell is:
a) 2
b) 8
c) 18
d) 32
Answer: b) 8

The capacity of K shell is:
a) 2
b) 8
c) 18
d) 32
Answer: a) 2

The maximum number of electrons in a shell is given by:
a) n^2
b) 2n^2
c) n+1
d) 2n
Answer: b) 2n^2

Azimuthal quantum number (l) indicates:
a) Size of orbital
b) Shape of orbital
c) Orientation of orbital
d) Spin of electron
Answer: b) Shape of orbital

Magnetic quantum number (m) describes:
a) Orientation of orbital
b) Energy of orbital
c) Size of orbital
d) Shape of orbital
Answer: a) Orientation of orbital

The spin quantum number (s) has values:
a) +1 and -1
b) +½ and -½
c) 0 and 1
d) n and l
Answer: b) +½ and -½

The total number of orbitals in a d-subshell is:
a) 3
b) 5
c) 7
d) 9
Answer: b) 5

The total number of orbitals in an f-subshell is:
a) 3
b) 5
c) 7
d) 9
Answer: c) 7

The electron capacity of f-subshell is:
a) 7
b) 14
c) 10
d) 6
Answer: b) 14

The electron configuration of oxygen (Z=8) is:
a) 1s² 2s² 2p⁴
b) 1s² 2s² 2p⁶
c) 1s² 2s² 2p³
d) 1s² 2s² 2p⁵
Answer: a) 1s² 2s² 2p⁴