Chapter Exam

Unit 1: Atomic Structure — Online MCQ Test

Q: Who proposed the planetary model of the atom with electrons revolving around a small, dense nucleus?

Answer: B. Ernest Rutherford — Rutherford proposed the nuclear model of the atom based on the alpha-particle scattering experiment. It placed the positive charge and most of the mass in a tiny nucleus.

Q: The de Broglie wavelength of a particle is given by which expression?

Answer: A. λ = h / mv — According to de Broglie, a moving particle has wave nature and its wavelength is λ = h/p = h/mv.

Q: For an electron in the 3p subshell, what are the possible values of the azimuthal quantum number (l)?

Answer: B. 1 only — For a p-subshell, the azimuthal quantum number is always l = 1, regardless of the principal quantum number.

Q: Which statement is correct about the magnetic quantum number for a p-subshell?

Answer: B. It can take values -1, 0, +1 — For a p-subshell, l = 1, so the magnetic quantum number m can be −1, 0, or +1. These represent the three p-orbitals.

CHEMISTRY · CLASS 11 INTERMEDIATE 1 YEAR · Telangana State Board

Practice Unit 1: Atomic Structure with a free chapter-wise online MCQ test for Telangana State Board CLASS 11 INTERMEDIATE 1 YEAR CHEMISTRY. This chapter covers: This chapter covers atomic models dual nature of matter de Broglie relationship Heisenberg uncertainty principle quantum numbers and orbitals. Students master Aufbau principle Paul.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Unit 1: Atomic Structure — Important Questions & Answers (FAQ)

Frequently asked questions from Telangana State Board CLASS 11 INTERMEDIATE 1 YEAR CHEMISTRY — Unit 1: Atomic Structure, with answers and explanations. These are sample questions; the exam has its own separate question set.

Who proposed the planetary model of the atom with electrons revolving around a small, dense nucleus?

A. J. J. Thomson
B. Ernest Rutherford ✓
C. Niels Bohr
D. Louis de Broglie

Answer: B. Ernest Rutherford
Rutherford proposed the nuclear model of the atom based on the alpha-particle scattering experiment. It placed the positive charge and most of the mass in a tiny nucleus.

The de Broglie wavelength of a particle is given by which expression?

A. λ = h / mv ✓
B. λ = mv / h
C. λ = h / m
D. λ = hν / v

Answer: A. λ = h / mv
According to de Broglie, a moving particle has wave nature and its wavelength is λ = h/p = h/mv.

For an electron in the 3p subshell, what are the possible values of the azimuthal quantum number (l)?

A. 0 only
B. 1 only ✓
C. 2 only
D. 0, 1, and 2

Answer: B. 1 only
For a p-subshell, the azimuthal quantum number is always l = 1, regardless of the principal quantum number.

Which statement best explains why the Bohr model fails for multi-electron atoms?

A. Electrons do not have mass
B. Electrons behave only like particles
C. It cannot account for electron-electron interactions and wave nature ✓
D. Nucleus does not exist in atoms

Answer: C. It cannot account for electron-electron interactions and wave nature
The Bohr model works well only for hydrogen-like species. It does not explain the behavior of multi-electron atoms because it ignores electron-electron repulsion and quantum mechanical nature of electrons.

Which statement is correct about the magnetic quantum number for a p-subshell?

A. It has only one value, 0
B. It can take values -1, 0, +1 ✓
C. It can take values 0 and 1 only
D. It is always equal to the principal quantum number

Answer: B. It can take values -1, 0, +1
For a p-subshell, l = 1, so the magnetic quantum number m can be −1, 0, or +1. These represent the three p-orbitals.

Next Chapter →

Unit 2: Classification of elements and Periodicity in Properties