6. The configuration 1s2, 2s2, 2p5, 3s1 shows

Correct Answer is: Excited state of fluorine

19. The value of Planks constant is 6.62 x 10-34 js. The velocity of light is 3 x 108 m/s. which value is closest to the wavelength in nanometers of a quantum of light with frequency of 8 x 1015 s ?

Correct Answer is: 5 x 10 -18 3 x 10 7

Structure of Atom MCQ Multiple Choice Questions Answers for Practice

Q: 1. For which of the following set of quantum numbers, an electron will have the highest energy?

Correct Answer is: 4, 1, 0, -1/2

Q: 14. Azimuthal quantum number defines

Correct Answer is: Spin of electron

Q: 18. The quantum number m of a free gaseous atom is associated with

Correct Answer is: The shape of orbital

1. For which of the following set of quantum numbers, an electron will have the highest energy?

3, 2, +1, +1/2
4, 1, 0, -1/2
4, 2, -1, +1/2
5, 0, 0, +1/2

2. Which of the following atoms or ion/atom have identical ground state configuration?

Li⁺ and He⁺
Na and K
Cl^- and Ar
F⁺ and Ne

3. A g-sub shell is characterized by

n=5
m=3
l= 4
l= 5

4. Which expression represents de-Broglie relationship?

h/mv = ρ
λ= h/mρ
h/mv = λ
mλ = v/ρ

5. The number of spherical nodes for 4d orbital is

Zero
Two
One
Three

6. The configuration 1s², 2s², 2p⁵, 3s¹ shows

Ground state of fluorine
Excited state of neon
Excited state of fluorine
Excited state of O₂^- ion

7. The electronic configuration of Cu⁺² ion is;

[Ar} 4s¹ 3d⁸
[Ar] 4s¹ 3d¹⁰
[Ar] 4s² 3d¹⁰ 4p¹
[Ar] 3d⁹

8. Which of the following orbitals has dumb-bell shape

9. The total number of orbitals in a shell having principle quantum number n is;

2n
n²
2n²
(n+l)

10. Bohrs radius for H-atom(n=1) is approximately0.53A^o. The radius of the first excited (n=2) is;

0.13 A^o
1.06A^o,
4.77A^o
2.12A^o

11. The species which is not paramagnetic among the following is;

Cl^-
Be^-
Ne⁺²
As⁺

12. What is the wavelength of light. Given energy =3.03 x 10^-19 j, h=6.62 x 10^-34 js and c=3.0 x 10 ⁸ m/s?

6.54nm
654nm
0.654nm
65.4 nm

13. The following quantum numbers are possible for how many electrons? n=3, l=2, m=+2

14. Azimuthal quantum number defines

e/m ratio of electron
Angular momentum of electron
Spin of electron
Magnetic momentum of an electron

15. The correct order of increasing energy of atomic orbitals is

5p<4f<6s<5d
4f<5p<5d<6s
5p<6s<4f<5d
5p<5d<4f<6s

16. Iso-electronic species are

F^-,O^-2
F^-,O⁺
F^-,O
F^-,O⁺²

17. Quantum numbers n=2,l=1 represent

1s orbital
2p orbital
2s orbital
3s orbital

18. The quantum number m of a free gaseous atom is associated with

The effective volume of the orbital
The spatial orientation an orbital
The shape of orbital
the energy of the orbital in the absence of the magnetic field

19. The value of Planks constant is 6.62 x 10^-34 js. The velocity of light is 3 x 10⁸ m/s. which value is closest to the wavelength in nanometers of a quantum of light with frequency of 8 x 10¹⁵ s ?

2 x 10^-25
40
5 x 10^-18 3 x 10⁷

20. For principle quantum number n=4, the number of orbitals having l=3 is

21. The energy of second Bohrs orbit of hydrogen atom is -328 kj/mol. Hence the energy of fourth orbit would be

-41 kj/mol
-164 kj/mol
-82 kj/mol
-1312 kj/mol

22. The orientation of an atom is governed by

Principle quantum number
Spin quantum number
Azimuthal quantum number
Magnetic quantum number

23. What is the maximum of electrons in an atom that can have the quantum numbers, n=4, ml=+1?

24. The measurement of the electron position is associated with an uncertainty in momentum which is equal to 10^-18 g cm /s. The uncertainty in electron velocity(cm/s) is; (me = 9.1 x 10^-28 g)

10⁸
10⁹
10¹¹
10⁶

25. Which of the following ion have electronic configuration; {Ar} 3d⁶?

Ni⁺³
Mn⁺³
Fe³⁺
Co⁺³

26. Deuterium nucleus contains

1p+1n
2p+0n
1p+1e
2p+2n

27. The line spectrum of He+ ion will resemble that of

Hydrogen atom
Helium atom
Li⁺ ion
Lithium atom

28. The maximum number of electrons in a sub shell with, l=3 and n=4 is

29. The correct set of four quantum numbers for valence electron of Rubidium(37) is

5, 1, 1, +1/2
5, 0, 0, +1/2
6, 0, 0, +1/2
5, 1, 0, +1/2

30. The number of electrons in 3d sub shell for element with atomic number 26 is

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