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Structure of Atom Practice Questions

Class 11 · Chemistry · 1867 free MCQs with instant results and detailed explanations.

1867
Total
608
Easy
937
Medium
322
Hard

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Topics in Structure of Atom

Quantum Mechanical Model 514
Atomic Models 596
Electron Configuration 335
Quantum Numbers 422

Sample Questions from Structure of Atom

Here are 10 sample questions. Start a quiz to get randomized questions with scoring.

Q1
Easy
Which atomic model proposed that electrons move in fixed orbits around the nucleus?
A. Bohr Model
B. Dalton's Model
C. Thomson Model
D. Rutherford Model
Show Answer & Explanation
Correct Answer: A
The Bohr Model describes electrons in fixed orbits with quantized energy levels.
Q2
Easy
Who proposed the first atomic theory that matter is made up of indivisible particles?
A. John Dalton
B. Ernest Rutherford
C. Niels Bohr
D. J.J. Thomson
Show Answer & Explanation
Correct Answer: A
John Dalton is credited with proposing the first atomic theory in the early 19th century.
Q3
Easy
What did J.J. Thomson discover using the cathode ray tube experiments?
A. Neutron
B. Electron
C. Proton
D. Nucleus
Show Answer & Explanation
Correct Answer: B
J.J. Thomson discovered the electron as a subatomic particle through his cathode ray tube experiments.
Q4
Medium
Which of the following atomic models proposed the quantization of electron energy levels?
A. Bohr Model
B. Thomson Model
C. Rutherford Model
D. Dalton's Model
Show Answer & Explanation
Correct Answer: A
The Bohr Model introduced the idea that electrons exist in specific energy levels rather than in any arbitrary path.
Q5
Medium
In the quantum mechanical model of the atom, which of the following statements is true about orbitals?
A. They have fixed paths for electrons
B. They are regions of probability distribution
C. They represent exact locations of electrons
D. They are always spherical in shape
Show Answer & Explanation
Correct Answer: B
Orbitals are not fixed paths but rather regions where there is a high probability of finding an electron.
Q6
Medium
What is the maximum number of electrons that can occupy an s subshell?
A. 2
B. 6
C. 10
D. 14
Show Answer & Explanation
Correct Answer: A
An s subshell can hold a maximum of 2 electrons, as it has only one orbital.
Q7
Medium
Which atomic model is known for the concept of an electron cloud?
A. Rutherford Model
B. Bohr Model
C. Quantum Mechanical Model
D. Thomson Model
Show Answer & Explanation
Correct Answer: C
The Quantum Mechanical Model describes electrons as existing in a 'cloud' of probability rather than fixed orbits.
Q8
Hard
In the quantum mechanical model, what is the shape of the s orbital?
A. Dumbbell
B. Spherical
C. Double dumbbell
D. Linear
Show Answer & Explanation
Correct Answer: B
The s orbital is spherical in shape, which allows for a uniform distribution of electron density around the nucleus.
Q9
Hard
What is the maximum number of electrons that can occupy a p subshell?
A. 2
B. 6
C. 10
D. 14
Show Answer & Explanation
Correct Answer: B
A p subshell can hold a maximum of 6 electrons as it contains three p orbitals, each capable of holding 2 electrons.
Q10
Hard
Which of the following models best describes electron behavior in atoms?
A. Planetary model
B. Wave model
C. Particle model
D. Rutherford model
Show Answer & Explanation
Correct Answer: B
The wave model incorporates the wave-particle duality of electrons, providing a comprehensive understanding of their behavior.

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Structure of Atom — Class 11 Chemistry Practice Questions Online

This page contains 1867 practice MCQs for the chapter Structure of Atom in Class 11 Chemistry. The questions are organized by difficulty — 608 easy, 937 medium, 322 hard — so you can choose the right level for your preparation.

Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 4 topics, giving you comprehensive coverage of the entire chapter.