Structure of Atom Multiple Choice Questions and Answers for Practice

16. Iso-electronic species are

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

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

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

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

1. The effective volume of the orbital
2. The spatial orientation an orbital
3. The shape of orbital
4. 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 ?

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

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

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

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

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

22. The orientation of an atom is governed by

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

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

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

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. 10⁸
2. 10⁹
3. 10¹¹
4. 10⁶

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

1. Ni⁺³
2. Mn⁺³
3. Fe³⁺
4. Co⁺³

26. Deuterium nucleus contains

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

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

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

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

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

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

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

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

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