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

Your comments:

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

Your comments:

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

Your comments:

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

Your comments:

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.

Your comments:

Question 5 of 20

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

3

1

2

4

Your comments:

Question 6 of 20

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

3p

3f

2s

3d

Your comments:

Question 7 of 20

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

1

5

3

2

Your comments:

Question 8 of 20

9. What information does indicate about wave?

Amplitude

Velocity

Frequency

Region of maximum electron density

Your comments:

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

Your comments:

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

Your comments:

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

Your comments:

Question 12 of 20

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

3n²

n⁴

n³

n²

Your comments:

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

Your comments:

Question 14 of 20

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

n and l

n

l

m

Your comments:

Question 15 of 20

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

2

1

3

4

Your comments:

Question 16 of 20

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

3

1

2

4

Your comments:

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

±2

±1

Your comments:

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

Your comments:

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

Your comments:

Question 20 of 20

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