Electronic Configuration of Atoms, 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. Which electronic configuration  violate the Pauli's exclusion principle?

A

B

C

D

Your comments:

Question 1 of 20

2. The ground state electron configuration of Fe is:

A

B

C

D

Your comments:

Question 2 of 20

3. What is the ground-state electronic configuration of Si?

1s² 2s² 2p⁶ 3s¹ 3p³

1s² 2s² 2p⁶ 3s² 3p²

1s² 2s² 2p⁷ 3s¹ 3p²

1s² 2s² 2p⁶ 3s³ 3p¹

Your comments:

Question 3 of 20

4. If there are three electrons in p-subshell, which one of the following is the correct electronic configuration for these electrons?

px⁰ py¹ pz²

px² py⁰ pz¹

px² py¹ pz⁰

px¹ py¹ pz¹

Your comments:

Question 4 of 20

5. Which one of the following electronic configurations depict an oxygen atom?

1s²2s²2p²

1s²2s²2p⁴

1s²2s²2p²3s²

1s²2s²2p¹

Your comments:

Question 5 of 20

6. Which electronic configuration represents a violation of Hund's rule for an atom in its ground state?

A

B

C

D

Your comments:

Question 6 of 20

7. The shape of a 2s orbital resembles:

An ellipse

Double spherical

A hockey stick

Double dumbbell

Your comments:

Question 7 of 20

8. Which quantum numbers must be the same for the orbitals so that they are designated to be degenerate in a one-electron system (like hydrogen)?

m only

l and m

n and m

n and l only

Your comments:

Question 8 of 20

9. Which of the following sets of orbitals is arranged in order of increasing energy?

4s < 3d < 4p < 5s < 4d

3d < 4s < 4p < 5s < 4d

4s < 3d < 4p < 5s < 4d

3d < 4s < 4p < 4d < 5s

Your comments:

Question 9 of 20

10. How many unpaired electrons are there in Ni²⁺ ( Z = 28)?

2

4

8

Your comments:

Question 10 of 20

11. Which of the following is a possible electronic configuration?

1s² 2s² 2p⁶ 3s² 3p⁸ 3d⁷

1s² 2s² 2p⁶ 3s² 3d¹²

1s² 2s³ 2p⁶

1s² 2s² 2p⁶ 3s² 3p⁴

Your comments:

Question 11 of 20

12. The Pauli exclusion principle states that:

Both the position of an electron and its momentum cannot be known simultaneously very accurately.

The wavelength and mass of a subatomic particle are related by I = h/m v

The wavelength of a photon of light times its frequency is equal to the speed of light.

No two electrons in the same atom can have the same set of four quantum numbers.

Your comments:

Question 12 of 20

13. The shape of the p_x orbital is:

Dumb-bell

Octahedral

Double Dumb-bell

Spherical

Your comments:

Question 13 of 20

14. Which of the following would be diamagnetic?

K

O

Ne

Al

Your comments:

Question 14 of 20

15. Which electron configuration denotes an atom in its ground state?

A

B

C

D

Your comments:

Question 15 of 20

16. The shape of a 3p orbital resembles:

Double spherical

A circle

Dumbbell

A sphere

Your comments:

Question 16 of 20

17. Why is the electronic configuration of Cr - [Ar] 4s¹ 3d⁵ and not [Ar] 4s² 3d⁴ as predicted by Aufbau Principle?

Because the 3d orbital is full with 5 electrons

Because the 4s orbital can hold only one electron

Because the 4s and 3d orbitals are then half-filled

Because the 4s orbital is half-filled

Your comments:

Question 17 of 20

18. Which of the following electronic configurations is possible?

1s² 2s² 2p¹⁰ 3s² 3d²

1s² 2s² 2p⁵ 3s² 3p² 3d¹

1s² 2s² 2p⁶ 3s² 3p²

1s² 2s² 2p⁶ 3s² 3p² 3d¹⁰

Your comments:

Question 18 of 20

19. Which of the following electronic configurations is impossible?

1s² 2s² 2p⁶ 3s² 3p² 4s²

1s² 2s² 2p⁶ 3s² 3p⁶4s²3d¹

2s² 2p⁶ 3s² 3p²

1s² 2s² 2p⁶

Your comments:

Question 19 of 20

20. As atomic orbitals are filled according to the Aufbau principle, the 6s orbitals are filled immediately after which of the following orbitals?

7s

5p

4f

5d

Your comments:

Question 20 of 20

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