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NEET Exam  >  NEET Test  >  Chemistry Class 11  >  Test: Structure of Atom - 1 - NEET MCQ

Structure of Atom - 1 - NEET Chemistry Class 11 Free MCQ Test with solutions


MCQ Practice Test & Solutions: Test: Structure of Atom - 1 (12 Questions)

You can prepare effectively for NEET Chemistry Class 11 with this dedicated MCQ Practice Test (available with solutions) on the important topic of "Test: Structure of Atom - 1". These 12 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: 12 minutes
  • - Number of Questions: 12

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Test: Structure of Atom - 1 - Question 1
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If the kinetic energy of an electron is increased four times, the wavelength of the de-Broglie wave associated with it would become

Detailed Solution: Question 1

The wavelength λ is inversely proportional to the square root of kinetic energy. So if KE is increased 4 times, the wavelength becomes half.

λ∝1/√KE

Hence Option A is the answer.

Test: Structure of Atom - 1 - Question 2
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Calculate the wavelength (in nanometer) associated with a proton moving at 1.0×103ms-1 (Mass of proton = 1.67×10-27kg and h = 6.63×10-34Js)

Detailed Solution: Question 2

Given mp = 1.67×10-27kg
h = 6.63×10-34Js
v = 1.0×103ms-1

We know wavelength λ = h/mv
∴λ = 6.63×10-34/(1.67×10-27 × 1.0×103)
= 0.40×10-10
≈ 0.40nm

Hence, Option (B) is the Correct Answer.

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Test: Structure of Atom - 1 - Question 3
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The frequency of light emitted for the transition n = 4 to n = 2 of He+ is equal to the transition in H atom corresponding to which of the following

Detailed Solution: Question 3

Correct Answer is A.

Test: Structure of Atom - 1 - Question 4
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The radius of the second Bohr orbit for the hydrogen atom is :
(Planck’s constant, h = 6.262×10-34Js: Mass of electron = 9.1091×10-31kg; Charge of electron e = 1.60210×10-19C; permittivity of vacuum ε0 = 8.854185×10-12kg-1m-3A2)

Detailed Solution: Question 4

Test: Structure of Atom - 1 - Question 5
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The number of radial nodes for 3p orbital is:

Detailed Solution: Question 5

  • Number of radial nodes = n - l – 1

where n = principal quantum number, l = azimuthal quantum number

  • For 3p orbital, n = 3 – 1 – 1 = 1
  • Number of radial nodes = 3 – 1 – 1 = 1. 

Test: Structure of Atom - 1 - Question 6
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A sub-shell with n = 6 , l = 2 can accommodate a maximum of

Detailed Solution: Question 6

n = 6, l = 2 means 6d → will have 5 orbitals. 

∴ max 10 electrons can be accommodate as each orbital can have maximum of 2 electrons. 

Test: Structure of Atom - 1 - Question 7
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Thomson’s plum pudding model explained:

Detailed Solution: Question 7

  • An atom consists of a positively charged sphere with electrons filled into it. The negative and positive charges present inside an atom are equal and as a whole, an atom is electrically neutral.
  • Thomson’s model of the atom as compared to plum pudding and watermelon.
  • He compared the red edible part of the watermelon to a positively charged sphere whereas the seeds of watermelon to negatively charged particles.

electrical world

Test: Structure of Atom - 1 - Question 8
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Which of the following conclusions could not be derived from Rutherford’s α -particle scattering experiment?

Detailed Solution: Question 8

  • Concept of electrons moving in a circular path of fixed energy called orbits was put forward by Bohr and not derived from Rutherford's scattering experiment.
  • Out of a large number of circular orbits theoretically possible around the nucleus.
  • The electron revolves only in those orbits which have a tired value of energy Hence, these orbits are called energy level or stationary states.

Test: Structure of Atom - 1 - Question 9
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The nature of positive rays depends on?

Detailed Solution: Question 9

  • The nature of positive rays produced in a vacuum discharge tube depends upon the nature of the gas-filled.
  • The positive rays consist of positive ions obtained by removing one or more electrons from gas molecules.

Test: Structure of Atom - 1 - Question 10
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The nucleus of a tritium atom, 3H, contains

Detailed Solution: Question 10

  • Tritium (3H) is the only radioactive isotope of hydrogen.
  • The nucleus of a tritium atom consists of a proton and two neutrons.

Test: Structure of Atom - 1 - Question 11
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The wavelengths of two photons are 2000 Å and 4000 Å respectively. What is the ratio of their energies?

Detailed Solution: Question 11



= 4000/2000
= 2

Test: Structure of Atom - 1 - Question 12
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The ion that is isoelectronic with CO is-

Detailed Solution: Question 12

Isoelectronic species are the having same number of electrons.
Number of electrons in CO = 6 + 8 = 14
O2- = 16 + 1 = 17
N2+ = 14 - 1 = 13
O2+ = 1 6 - 1 = 15
CN- = 6 + 7 + 1 = 14
Hence, CO isoelectronic with CN− ion.

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About this NEET Practice Test

This test contains 12 MCQs on Structure of Atom - 1 with detailed solutions for each question. It is part of the Chemistry Class 11 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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