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.