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Chapter 5

Atomic Structure

1. Maximum number of electrons in a subshell is given by:

1. 2 + 1
2. 2-1
3. 2(2 + 1)
4. 2 (2-1)

2. An orbital can accommodate maximum electrons:

1. 10
2. 14
3. 6
4. 2

3. How many times the mass of neutron is greater than that of electron?

1. 1480
2. 2000
3. 200
4. 1840

4. Lyman Series is obtained when electron in an atom jumps from higher energy level to:

1. Ground level
2. 2nd level
3. 3rd level
4. 4th level

5. When 6d orbital is complete, the entering electron goes into:

1. 7f
2. 7s
3. 7p
4. 7d

6. Lyman series occur in:

1. Visible region
2. U.V. region
3. I.R. region
4. None of these

7. e/m value for positive rays is maximum for:

1. Hydrogen
2. Helium
3. Oxygen
4. Nitrogen

8. According to Bohr’s atomic model, radius of second orbit of hydrogen atom is:

1. 0.529 Å
2. 2.116 A
3. 4.0 Å

9. Lines of Paschen series are produced when electrons jump from higher orbits to ——- orbit.

1. 1st
2. 2nd
3. 3rd
4. 4th

10. The electronic configuration of an atom is 1s²,2⁵,2p⁴. The number of unpaired electrons in this atom is:

1. 0
2. 2
3. 4
4. 6

11. Negative charge on cathode rays we established by:

1. William Crook
2. Perrin
3. R.A Millikan
4. Hittorf

12. An orbital which is spherical and symmetrical is:

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

13. Angstrom is the unit of:

1. time
2. length
3. mass
4. frequency

14. Mass of electron is:

1. 9.1095 x 10³¹ kg
2. 9.1095 x 10^-31 kg
3. 9.1095 x 10^-27 kg
4. 9.1095 x 10^-31 g

15. Neutron was discovered by:

1. Chadwick
2. C.D. Anderson
3. Rutherford
4. Goldstein

16. Bambardment of a-particles on Beryllium (Be) atom, emits neutron and this process is called:

1. Natural radioactivity
2. Artificial radioactivity
3. Pauli’s exclusion principle
4. Hund’s rule

17. Balmer series in hydrogen spectrum lies in the region:

1. Ultraviolet
2. Visible
3. Infrared
4. Microwave

18. The value of Planck’s constant is:

1. 6.62 x 10^-34 J.s
2. 6.62 x 10^-27 J.s
3. 6.62 x 10^-21 J.s.
4. 6.62 x 10^-31 J.s

19. Properties of waves are:

1. Wave length
2. Wave number
3. Frequency
4. All

20. The number of neutrons present in to  K is:

1. 39
2. 18
3. 20
4. 19

21.  When 4s orbital is complete, the electron goes into:

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

22. The limiting line of Balmer series lies in the region:

1. Visible
2. U.V.
3. Near I.R
4. Far IR

23. Which of the following orbitals is dumb bell shaped?

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

24. Free neutron decays into a proton with the emission of an electron and a

1. Positron
2. Neutrino
3. Beta Particle
4. Helium nucleus

25. The mass of an oxygen atom is:

1. 2.657 x 10^-23 g
2. 2.657 x 10²³g
3. 16g
4. 32g

26. The electrons occupying an orbital are distinguished by:

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

27. The mass of proton is (in kg):

1. +1.6 x 10^-19
2. -1.6 10^-19
3. 1.672 x 10^-27
4. 9.1 x 10^-31

28. Bohr’s model of atom is contradicted by:

1. Photo electric effect
2. Pauli’s exclusion principle
3. Heisenberg’s uncertainty principle
4. Aufbau principle

29. K-series X-Rays have wavelength:

1. Longer
2. Smaller
3. Same
4. Different

30. What is the value of (n + l) for the 3s subshell?

1. 2
2. 1
3. 5
4. 3

31. Cathode rays consist of:

1. Electrons
2. Protons
3. Neutrons
4. Nucleons

32. The d-subshell consists of:

1. 5-orbitals
2. 6-orbitals
3. 7-orbitals
4. 10-orbitals

33. Orbitals having same energy are called:

1. Hybrid orbitals
2. Valence orbitals
3. d-orbitals
4. Degenerate orbitals

34. Positive rays were discovered by:

1. J.J. Thomson
2. Rutherford
3. William Crooks
4. E. Goldstein

35. Mass of one mole of electron is:

1. 0.55 mg
2. 0.184 mg
3. 1.673 mg
4. 1.008 mg

36. For the P sub shell the azimuthal quantum number”/” is:

1. 2
2. 3
3. zero
4. 1

37. If an electron is free from the attraction of nucleus then its energy is:

1. Negative
2. Positive
3. Zero
4. None of these

38. In discharge tube experiment, the pressure of gas was maintained at:

1. 760 torr
2. 0.1 torr
3. 0.01 torr
4. None

39. Splitting of spectral lines when atoms are subjected to strong magnet

1. Zeeman effect
2. Stark effect
3. Compton effect
4. Photoelectric effect

40. Which one of the following series lies in ultraviolet region:

1. Lyman
2. Balmer
3. Paschen
4. Brackett

41. The shape of ‘P’ orbitals is:

1. Double dumb-bell
2. Spherical
3. Dumb-bell
4. Complicated

42. Value of Rydberg’s constant is:

1. 1.7904 x 10⁷ m^-1
2. 1.9768×10⁷ m^-1
3. 1.09678 x 10⁷ m^-1
4. 1.6 x 10⁷ m^-1

43. When the Azimuthal quantum number is 3 then ‘m’ can have

1. 5 values
2. 7 values
3. 2 values
4. 3 values

44. Total number of spectral regions in sunlight spectrum is:

1. 4
2. 6
3. 7
4. 8