Chemistry Chapter 5 Atomic Structure Mcqs Test Online 11th Class Punjab

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Question 1 of 10

Chemistry

1. For which species Bohr’s theory does not apply

Be

H

Li²⁺

He⁺

Question 1 of 10

Question 2 of 10

2. The third line in Blamer series corresponds to an electronic transfer between which Bohr’s orbit in hydrogen.

5 → 2

5 → 3

4 → 3

4 → 2

Question 2 of 10

Question 3 of 10

3. From the discharge tube experiment, it is concluded that

Mass of a proton is in fraction

Nucleus contains positive change

Positive rays are heavier than protons

Matter contained electrons

Question 3 of 10

Question 4 of 10

4. Which of following quantum numbers is not obtained from Schrodinger wave equalier?

Azimuthal quantum number, l

Principal quantum number, n

Spin quantum number, s

Magnetic quantum number, m

Question 4 of 10

Question 5 of 10

5. The energy of an electromagnetic radiation is 3 x 10⁻¹² ergs. What is its wave-length in nano meters?

662.5

228.3

3000

400

Question 5 of 10

Question 6 of 10

6. Which one of the following is not isoelectronic pair

Mg²⁺, Be²⁺

F, Al³⁺

N³⁻, O²⁻

N²⁻,O²⁻

Question 6 of 10

Question 7 of 10

7. When an electron of charge ‘e’ and mass ‘m’ moves with velocity ‘v’ about the nuclear change Ze in the circular orbit of radius ‘r’, the P.E of electron is given by

Ze²/r²

Ze²/r

-Ze²/r

mv²/r

Question 7 of 10

Question 8 of 10

8. Electronic configuration of species M²⁺ is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁶ and its atomic weight is 56 number of neutrons in the nuclear of species M is

28

20

30

26

Question 8 of 10

Question 9 of 10

9. Wave mechanical model of the atom depends upon

Uncertainty Principle

Schrodinger’s wave equation

All of the above

De-Broglie’s concept of duality.

Question 9 of 10

Question 10 of 10

10. Which one of the following statement is not correct?

The angular movement of the electron in the ground state of hydrogen atom is equal to h/2

Lyman series of hydrogen spectrum occurs in the ultraviolet region

Rydberg’s constant and wave number have same unit

The radius of first Bohr orbit of hydrogen atom is 2.116 x 10⁻⁸ cm

Question 10 of 10

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