Chapter Exam

Chapter 2: Structure of Atom — Online MCQ Test

Q: Which subatomic particle has a positive charge?

Answer: B. Proton — A proton carries one unit of positive charge. Electrons are negatively charged and neutrons are neutral.

Q: The maximum number of electrons that can be accommodated in the first shell is:

Answer: A. 2 — For the first shell, n = 1, so maximum electrons = 2n^2 = 2.

Q: The Bohr model of the atom successfully explains the spectrum of:

Answer: A. Hydrogen atom — Bohr's model works well for hydrogen-like species, especially the hydrogen atom.

Q: Which of the following is NOT a postulate of Bohr's model?

Answer: C. Electrons can have any energy while revolving — Bohr's model says electron energies are quantized, not continuous, in allowed orbits.

Q: In the hydrogen atom, the energy of an electron in the nth orbit is proportional to:

Answer: C. 1/n2 — For hydrogen, the energy of the electron varies as 1/n2, becoming less negative as n increases.

CHEMISTRY · CLASS 11 FIRST PUC · Karnataka State Board

Practice Chapter 2: Structure of Atom with a free chapter-wise online MCQ test for Karnataka State Board CLASS 11 FIRST PUC CHEMISTRY. This chapter covers: Atomic structure Bohr model Quantum numbers Orbitals Electronic configuration Aufbau principle Hunds rule Pauli exclusion principle De Broglie Dual nature. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 2: Structure of Atom — Important Questions & Answers (FAQ)

Frequently asked questions from Karnataka State Board CLASS 11 FIRST PUC CHEMISTRY — Chapter 2: Structure of Atom, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which subatomic particle has a positive charge?

A. Electron
B. Proton ✓
C. Neutron
D. Photon

Answer: B. Proton
A proton carries one unit of positive charge. Electrons are negatively charged and neutrons are neutral.

The maximum number of electrons that can be accommodated in the first shell is:

A. 2 ✓
B. 8
C. 18
D. 32

Answer: A. 2
For the first shell, n = 1, so maximum electrons = 2n^2 = 2.

The Bohr model of the atom successfully explains the spectrum of:

A. Hydrogen atom ✓
B. Sodium atom
C. Helium atom
D. Carbon atom

Answer: A. Hydrogen atom
Bohr's model works well for hydrogen-like species, especially the hydrogen atom.

Which of the following is NOT a postulate of Bohr's model?

A. Electrons revolve in fixed circular orbits
B. Electron energy is quantized
C. Electrons can have any energy while revolving ✓
D. Emission or absorption occurs during transition between orbits

Answer: C. Electrons can have any energy while revolving
Bohr's model says electron energies are quantized, not continuous, in allowed orbits.

In the hydrogen atom, the energy of an electron in the nth orbit is proportional to:

A. n
B. 1/n
C. 1/n2 ✓
D. n2

Answer: C. 1/n2
For hydrogen, the energy of the electron varies as 1/n2, becoming less negative as n increases.

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