Quantum Mechanical Model of Atom, Class 11 Chemistry NCERT Solutions

1. There will be total 20  MCQ in this test.
2. Please keep a pen and paper ready for rough work but keep your books away.
3. The test will consist of only objective type multiple choice questions requiring students to mouse-click their correct choice of the options against the related question number.
4. No negative marking for incorrect choice.
5. Please click on “Finish the Test” when you want to exit.
6. All the best – Happy Studying.

1. For the value of principal quantum number 3 the possible values for azimuthal quantum number will be:

  0,1,2,3

 0,1,2

 -3,-2,-1,0,+1,+2,+3

 1,2,3

Question 1 of 20

2. Which of the subshells below do not exist due to the constraints upon the azimuthal quantum number?

 2s

 4d

 2d

 2p

Question 2 of 20

3. Which one of the following represents an impossible arrangement for the values of n, l, m and ms?

  3, 2, -2, ½

 3, 2, -3,½

 5, 3, 0,½

 4, 0, 0, ½

Question 3 of 20

4. A sub shell with l = 2 can take up a maximum of :

  10 electrons

 8 electrons

 3 electrons

 5 electrons

Question 4 of 20

5. Which statement regarding an orbital is FALSE?

 An electron shell consists of a collection of orbitals with the same principal quantum number.

 An orbital may be designated with the letters K,L,M,N.

 An orbital is three dimensional.

 An orbital describes the region in which the possibility of finding an electron is maximum.

Question 5 of 20

6. An orbital is identified by how many quantum numbers?

 3

 1

 2

 4

Question 6 of 20

7. Which one of the following is an incorrect orbital notation?

  3p

 3f

 2s

 3d

Question 7 of 20

8. For l= 2, how many orbitals are possible?

 1

 5

 3

 2

Question 8 of 20

9. What information does indicate about wave?

 Amplitude

 Velocity

 Frequency

 Region of maximum electron density

Question 9 of 20

10. Which one of the following represents a wrong set of quantum numbers for an electron in an atom? (arranged as n, l, m, and s)

  2, 1, -1, -1/2

 3, 3, 3,± 1/2

 1, 0, 0, ±1/2

  5, 4, – 3, +1/2

Question 10 of 20

11. Which set of quantum numbers is correct with n = 3?

  l = 2, ml = +3, m_s = +1/2

 l = 1, ml = +3, m_s = +1/2

 l = 2, ml = +2, m_s = +1/2

 l = 3, ml = +2, m_s = 1

Question 11 of 20

12. All of the orbitals in a given electron shell can have the same value of the quantum number except.

 Principal

 Spin

 Magnetic

 Azimuthal

Question 12 of 20

13. Total number of orbitals in a shell is given by

  3n²

 n⁴

 n³

 n²

Question 13 of 20

14. Which one of the following represents an acceptable possible set of quantum numbers (in the order n, l, m_| and m_s for an electron in an atom?

 2, 1, 2, 1/2

 2, 1, 0, 0

 2, 0, 1, -1/2

 2, 1, -1, 1/2

Question 14 of 20

15. Which quantum number determines the radius of an atom?

  n and l

 n

 l

 m

Question 15 of 20

16. Calculate the value of principal quantum number for the subshell notation 3p?

  2

 1

 3

 4

Question 16 of 20

17. Calculate the value of azimuthal quantum number for the subshell notation 4d?

  3

 1

 2

 4

Question 17 of 20

18. Which one of the following is not a valid value for the magnetic quantum number of an electron in a 5d sub shell?

  ±3

 Â±2

  ±1

Question 18 of 20

19. Quantum mechanics is based on a fundamental equation which is called

  Newton’s law

 Schrodinger equation

  Boyle’s law

 Equation of state

Question 19 of 20

20. Which pair of quantum numbers determine the energy of an electron in an orbital?

  n and m_s

 n and m

 n and l

 l and m

Question 20 of 20

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