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NEET Exam  >  NEET Test  >  NCERT Based Tests  >  Assertion & Reason Test: Atoms - NEET MCQ

Atoms - Free Assertion & Reason Questions with Solutions NEET NCERT Based


MCQ Practice Test & Solutions: Assertion & Reason Test: Atoms (11 Questions)

You can prepare effectively for NEET NCERT Based Tests for NEET with this dedicated MCQ Practice Test (available with solutions) on the important topic of "Assertion & Reason Test: Atoms". These 11 questions have been designed by the experts with the latest curriculum of NEET 2026, to help you master the concept.

Test Highlights:

  • - Format: Multiple Choice Questions (MCQ)
  • - Duration: 22 minutes
  • - Number of Questions: 11

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Assertion & Reason Test: Atoms - Question 1
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Directions : In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion (A): According to Rutherford, the atomic model, the path of electrons is parabolic.

Reason (R): Rutherford could not explain the stability of atoms.

Detailed Solution: Question 1

According to Rutherford, “the entire positive charge and most of the mass of the atom is concentrated in a small volume called the nucleus, with electrons revolving around the nucleus just as planets revolve around the Sun.” So the assertion is false.

The electron orbiting around the nucleus radiates energy. As a result, the radius of the orbit continuously decreases and the electrons fall into the nucleus. So, the stability of atoms is not explained. Hence the reason is true.

Assertion & Reason Test: Atoms - Question 2
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Directions : In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion (A): Bohr model is not applicable for multi-electron models.

Reason (R): Bohr model cannot account for sublevel (s, p, d, f) orbitals and electron spin.

Detailed Solution: Question 2

Bohr model works well for H and He+ having one electron only. But it does not work for multi-electron atoms, since it cannot account for sublevel (s, p, d, f) orbitals and electron spin. So, assertion and reason both are true and reason explains the assertion.

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Assertion & Reason Test: Atoms - Question 3
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Directions : In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion (A): Bohr postulated that the electrons in stationary orbits around the nucleus do not radiate.

Reason (R): According to classical Physics, all moving electrons radiate.

Detailed Solution: Question 3

Bohr postulated that electrons in stationary orbits around the nucleus do not radiate. This is true.

According to classical Physics, the moving electrons radiate only when they jump from a higher energy orbit to the lower energy orbit. So, the reason is false.

Assertion & Reason Test: Atoms - Question 4
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Directions : In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion (A): In the α-particle scattering experiment, most of the α-particles pass undeviated.

Reason (R): Most of the space in the atom is empty.

Detailed Solution: Question 4

Most of the α-particles pass roughly in a straight line (within 10) without deviation. This shows that no force is acting on them. So the assertion is true.

Most of the space in the atom is empty. Only 0.14% of α-particles are scattered more than 1°.

Assertion & Reason Test: Atoms - Question 5
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Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

Assertion : According to classical theory the proposed path of an electron in Rutherford atom model will be parabolic.

Reason : According to electromagnetic theory an accelerated particle continuously emits radiation.

Detailed Solution: Question 5

Explanation: The Assertion is incorrect because, according to classical theory, the proposed path of an electron in the Rutherford atom model would not be parabolic; it would be elliptical or circular. The model predicted that electrons orbit the nucleus much like planets orbiting the sun, which would lead to closed orbits, not open parabolic paths.

The Reason is correct in stating that according to classical electromagnetic theory, an accelerated charged particle emits radiation. However, this emission of radiation would cause the electron to lose energy and spiral into the nucleus rather than follow a parabolic path. This was one of the key issues with the Rutherford model, as it could not explain the stability of atoms, since classical mechanics would predict that electrons should crash into the nucleus rather than staying in a stable orbit.

Assertion & Reason Test: Atoms - Question 6
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Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

Assertion : Electrons in the atom are held due to Coulomb forces.

Reason : The atom is stable only because the centripetal force due to Coulomb’s law is balanced by the centrifugal force.

Detailed Solution: Question 6

Correct option is C. If the Assertion is correct but Reason is incorrect.

Explanation: The Assertion is correct. Electrons in an atom are indeed held in their positions due to the Coulomb force, which is the electric force between the positively charged nucleus and the negatively charged electrons.

However, the Reason is incorrect. The stability of an atom is not due to a balance of centripetal and centrifugal forces. The classical concept of centrifugal force balancing the Coulombic centripetal force, as would be the case in a planetary model of the atom, is not valid in quantum mechanics. In quantum mechanics, electrons occupy orbitals around the nucleus without necessarily revolving in the classical sense, and their positions and energies are described by wave functions. The stability of the atom is due to the quantum mechanical principles, including the Heisenberg Uncertainty Principle and the Pauli Exclusion Principle, not a balance of classical forces.

Assertion & Reason Test: Atoms - Question 7
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Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

Assertion : Between any two given energy levels, the number of absorption transitions is always less than the number of emission transitions.

Reason : Absorption transitions start from the lowest energy level only and may end at any higher energy level. But emission transitions may start from any higher energy level and end at any energy level below it.

Assertion & Reason Test: Atoms - Question 8
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Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

Assertion : The force of repulsion between atomic nucleus and α-particle varies with distance according to inverse square law.

Reason : Rutherford did α-particle scattering experiment.

Detailed Solution: Question 8

Rutherford confirmed that the repulsive force of α- particles due to the nucleus varies with distance according to inverse square law and that the positive charges are concentrated at the centre and not distributed throughout the atom.

Assertion & Reason Test: Atoms - Question 9
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Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

Assertion : Bohr had to postulate that the electrons in stationary orbits around the nucleus do not radiate.

Reason: According to classical physics all moving electrons radiate.

Detailed Solution: Question 9

Bohr postulated that electrons in stationary orbits around the nucleus do not radiate. This is the one of Bohr’s postulates, According to this the moving electrons radiate only when they go from one orbit to the next lower orbit.

Assertion & Reason Test: Atoms - Question 10
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Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

Assertion : Hydrogen atom consists of only one electron but its emission spectrum has many lines.

Reason : Only the Lyman series is found in the absorption spectrum of hydrogen atoms whereas in the emission spectrum, all the series are found.

Detailed Solution: Question 10

When the atom gets appropriate energy from outside, then this electron rises to some higher energy level. Now it can return either directly to the lower energy level or come to the lowest energy level after passing through other lower energy levels hence all possible transitions take place in the source and many lines are seen in the spectrum.

Assertion & Reason Test: Atoms - Question 11
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Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

Assertion : In Lyman series, the ratio of minimum and maximum wavelength is 3/4

Reason : Lyman series constitute spectral lines corresponding to transition from higher energy to ground state of the hydrogen atom.

Detailed Solution: Question 11

For the Lyman series, n1 ​= 1. For the next level, n2 ​= 2

so by eq.1 the ratio of minimum and maximum wavelength is 3/4.

Hence the assertion is correct.

Yes, the Lyman series constitutes spectral lines corresponding to the transition from higher energy to the ground state of the hydrogen atom. so the reason is also correct. But the reason is not the correct explanation of the assertion. Hence option 'B' is correct.

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About this NEET Practice Test

This test contains 11 MCQs on Assertion & Reason Test: Atoms with detailed solutions for each question. It is part of the NCERT Based Tests for NEET course on EduRev, designed to align with the current NEET syllabus. Each solution explains not just the correct answer but also gives you an understanding of the topic — not just to attempt the question but also help you prepare for the exam with practice.

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