Quiz  /  Quantum Numbers Class 12 MCQ Questions With Answers

  • 1. 
    Which orbital shows a violation of Hund's Rule?

  • A
  • B
  • C
  • D

  • 2. 
    How many 4d orbitals are there in an atom?

  • 1
  • 3
  • 5

  • 3. 
    Identify the subshell in which electrons with the following quantum numbers are found:n = 3, l = 2

  • 3s
  • 3p
  • 3d

  • 4. 
    The maximum number of electrons with quantum numbers with n=3 and l=2 is

  • 2
  • 4
  • 6
  • 10

  • 5. 
    "Electrons fill equal energy orbitals singly before pairing."

  • aufbau principle
  • Hund's Rule
  • Pauli Exclusion Principle
  • Uncertainty Principle

  • 6. 
    What quantum number describes the energy level of an orbital?

  • l
  • m
  • s
  • n

  • 7. 
    Write a set of quantum numbers for a 4d orbital.

  • (4,1,0, -1/2)
  • (4,2,-2, +1/2)
  • (4,0,2,-1/2)

  • 8. 
    How many orbitals are available to hold electrons in the 4th energy level (n=4)?

  • 4
  • 8
  • 16
  • 32

  • 9. 
    Which rule shows us that we have to add electrons singly to orbitals until each has one before we start pairing?

  • Hund's Rule
  • Pauli Exclusion
  • Aufbau Principle
  • Paschen Series

  • 10. 
    The first energy level to have d-orbitals is:

  • 1
  • 2
  • 3
  • 4

  • 11. 
    For a principle quantum number, "n", equal to 2, what is the total electron capacity of that level?

  • 2
  • 4
  • 8
  • 16

  • 12. 
    The difference between an orbit and an orbital is:

  • an orbit is a set path, but an orbital has no dimension
  • an orbital is a set path, but an orbit cannot be defined
  • an orbit is a set path, but an orbital is a 3-dimensional region in which electrons may be found with high probability
  • there is no difference when it comes to electron configurations

  • 13. 
    Which rule is broken by this electron configuration?

  • the Aufbau principle
  • the Pauli exclusion principle
  • Hund's rule
  • Conservation of Energy

  • 14. 
    Any given orbital may hold a maximum of __ electrons

  • 2
  • 8
  • 18
  • 32

  • 15. 
    How many orbitals (including sub orbitals) are found in a shell with n = 2?

  • 2
  • 3
  • 4

  • 16. 
    According to the Aufbau Principle, which sublevel should starting filling with electrons after 5s?

  • 6s
  • 5p
  • 4d
  • 3f

  • 17. 
    Which of the following quantum number sets is not allowed?

  • { 3, 2, +1, -1/2 }
  • { 5, 3, -1, +1/2 }
  • { 12, 1, +2, +1/2 }
  • { 7, 6, -5, -1/2 }

  • 18. 
    Which orbital shows a violation of the Aufbau Principle?

  • A
  • B
  • C
  • D

  • 19. 
    Which principle states that no two electrons will occupy the same space in an atom?

  • Hund's Rule
  • Pauli Exclusion Principle
  • Aufbau Principle
  • Pauling Postulate

  • 20. 
    How many valence electrons are in an atom of sulfur?

  • 2
  • 4
  • 6
  • 8

  • 21. 
    Is the 5p orbital permitted?

  • yes
  • no

  • 22. 
    Which orbitals cannot exist

  • 3p
  • 4d
  • 3f
  • 6s

  • 23. 
    Which set of Quantum numbers is not allowed

  • (3,1,1,-1/2)
  • (2,1,-2,+1/2)
  • (4,2,-1,-1/2)
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