Structure of Atom MCQs Quiz Multiple Choice Questions & Answers

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

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

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

1. Cl^- and Ar
2. F⁺ and Ne
3. Li⁺ and He⁺
4. Na and K

3. A g-sub shell is characterized by

1. l= 4
2. l= 5
3. n=5
4. m=3

4. Which expression represents de-Broglie relationship?

1. h/mv = λ
2. mλ = v/ρ
3. h/mv = ρ
4. λ= h/mρ

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

1. One
2. Three
3. Zero
4. Two

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

1. Excited state of fluorine
2. Excited state of O₂^- ion
3. Ground state of fluorine
4. Excited state of neon

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

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

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

1. d
2. f
3. s
4. p

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

1. 2n²
2. (n+l)
3. 2n
4. n²

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

1. 4.77A^o
2. 2.12A^o
3. 0.13 A^o
4. 1.06A^o,

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

1. Ne⁺²
2. As⁺
3. Cl^-
4. Be^-

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?

1. 0.654nm
2. 65.4 nm
3. 6.54nm
4. 654nm

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

1. 18
2. 4
3. 1
4. 2

14. Azimuthal quantum number defines

1. Spin of electron
2. Magnetic momentum of an electron
3. e/m ratio of electron
4. Angular momentum of electron

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

1. 5p<6s<4f<5d
2. 5p<5d<4f<6s
3. 5p<4f<6s<5d
4. 4f<5p<5d<6s

16. Iso-electronic species are

1. F^-,O
2. F^-,O⁺²
3. F^-,O^-2
4. F^-,O⁺

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

1. 2s orbital
2. 3s orbital
3. 1s orbital
4. 2p orbital

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

1. The shape of orbital
2. the energy of the orbital in the absence of the magnetic field
3. The effective volume of the orbital
4. The spatial orientation an orbital

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 ?

1. 5 x 10^-18 3 x 10⁷
2. 2 x 10^-25
3. 40

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

1. 5
2. 9
3. 3
4. 7

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

1. -82 kj/mol
2. -1312 kj/mol
3. -41 kj/mol
4. -164 kj/mol

22. The orientation of an atom is governed by

1. Azimuthal quantum number
2. Magnetic quantum number
3. Principle quantum number
4. Spin quantum number

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

1. 3
2. 6
3. 4
4. 15

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)

1. 10¹¹
2. 10⁶
3. 10⁸
4. 10⁹

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

1. Fe³⁺
2. Co⁺³
3. Ni⁺³
4. Mn⁺³

26. Deuterium nucleus contains

1. 1p+1e
2. 2p+2n
3. 1p+1n
4. 2p+0n

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

1. Li⁺ ion
2. Lithium atom
3. Hydrogen atom
4. Helium atom

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

1. 10
2. 12
3. 14
4. 16

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

1. 6, 0, 0, +1/2
2. 5, 1, 0, +1/2
3. 5, 1, 1, +1/2
4. 5, 0, 0, +1/2

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

1. 8
2. 10
3. 4
4. 6