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Class 11 Chemistry MCQs on Atom Structure

May 24, 2025

Class 11 Chemistry Chapter 2: Structure of Atom MCQs

Overview

  • This section includes multiple-choice questions (MCQs) from the CBSE board curriculum related to the chapter "Structure of Atom".
  • These questions help in reviewing the key concepts needed for Class 11 Annual exams and competitive exams like NEET and JEE.

Questions and Answers

  1. Discovery of Neutron

    • Discovered by: Chadwick (1932)
  2. Composition of Atomic Nucleus

    • Consists of: Protons and Neutrons
  3. Radius of Atomic Nucleus

    • Order of magnitude: 10^-13 cm
  4. Properties of Isotopes

    • Have similar chemical but different physical properties.
    • Definition: Atoms with the same atomic number but different mass numbers.
  5. Isobars

    • Definition: Atoms of different elements with the same mass number but different atomic numbers.
    • Example: 40 K 19 and 40 Ca 20
  6. Atomic Orbital

    • Defined as the region with the maximum probability of finding an electron.
  7. Quantum Numbers

    • Principal, Azimuthal, and Magnetic Quantum Numbers:
      • Related to Size, Shape, and Orientation respectively.
  8. Electronic Configuration of Chromium (Z=24)

    • Configuration: [Ne] 3s 2 3p 6 3d 5 4s 1
  9. Aufbau Principle

    • Electrons enter orbitals where (n + l) is minimum.
    • 4s orbital is filled before 3d orbital.
  10. Permissibility in Quantum Numbers

    • Example where it is not permissible: n= 4, l = 4, m= 1
    • Azimuthal quantum number (l) must be between 0 and n-1.

Additional Resources

  • Important questions and topics for JEE Main are available through linked visual aids.