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

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Question 1 of 10

Chemistry

1. Which one of the following is not isoelectronic pair

N³⁻, O²⁻

F, Al³⁺

Mg²⁺, Be²⁺

N²⁻,O²⁻

Question 1 of 10

Question 2 of 10

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

Spin quantum number, s

Magnetic quantum number, m

Azimuthal quantum number, l

Principal quantum number, n

Question 2 of 10

Question 3 of 10

3. 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

26

30

20

Question 3 of 10

Question 4 of 10

4. Wave mechanical model of the atom depends upon

All of the above

Schrodinger’s wave equation

De-Broglie’s concept of duality.

Uncertainty Principle

Question 4 of 10

Question 5 of 10

5. 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/r

Ze²/r

Ze²/r²

mv²/r

Question 5 of 10

Question 6 of 10

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

5 → 3

4 → 3

5 → 2

4 → 2

Question 6 of 10

Question 7 of 10

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

Positive rays are heavier than protons

Matter contained electrons

Mass of a proton is in fraction

Nucleus contains positive change

Question 7 of 10

Question 8 of 10

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

400

662.5

3000

228.3

Question 8 of 10

Question 9 of 10

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

Li²⁺

H

Be

He⁺

Question 9 of 10

Question 10 of 10

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

Rydberg’s constant and wave number have same unit

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

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

Question 10 of 10

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