11th class (FSc) chemistry Unit 5 MCQs
26. Lyman series is obtained when electron in an atom jumps from higher energy level is:
a. 3rdlevel
b. Ground level
c. 4thlevel
d. 2ndlevel
27. Lines of Paschen series are produce when electrons jump from higherorbites to …… orbits:
a. 3rd
b. 1st
c. 4th
d. 2nd
28. The wavelength of Lyman series lies in the region:
a. I.R
b. U.V
c. Visible
d. None of these
29. Splitting of spectral line when excited atoms are subjected to stron gelectric field is called:
a. Photoelectric effect
b. Zeeman effect
c. Compton effect
d. Stark effect
30. Spilting of spectral lines of the hydrogen atom under the influence of magnetic field is called:
a. Compton effect
b. Stark effect
c. Photoelectrical effect
d. Zeeman effect
31. Value of the Rydberg’s constant is:
a. 1.09678 x107m-1
b. 1.7904 x 107
c. 1.6 x 107m-1
d. 1.9768 x 107m-1
32. Bohr model of atom is contradicated by:
a. Heisenberg’s uncertainty
b. Planck’s quantum theory
c. Dual nature of matter
d. All of above
33. In ground state of an atom, the electron is present:
a. Nearest to nucleus
b. In the nucleus
c. Farthest from the nucleus
d. In the second shell
34. Which particle has greater wavelenght?
a. Neutron
b. Electron
c. a-particle
d. Proton
35. The shape of p orbitals is:
a. Dumb-bell
b. Double dump-bell
c. Complicated
d. Spherical
36. Quantum number values for 2p orbitals are:
a. n = 1 ,𝓁 = 0
b. n = 2 ,𝓁 = 1
c. n = 2 ,𝓁 = 0
d. n = 1 ,𝓁 = 2
38. The formula used to find out the number of electrons in a sub-shell is:
a. 3(2I+1)
b. 2(2I+1)
c. (2I+2)
d. (2I+1)
39. What is the value of (n+𝓁) for the 3d sub-shell?
a. 5
b. 3
c. 6
d. 4
40. An orbital which is shperical and symmetrical is:
a. D-orbital
b. S-orbital
c. F-orbital
d. P-orbital
41. When 6d orbital is complete, the next entering electron goes into the:
a. 7p orbital
b. 7f orbital
c. 7d orbital
d. 7s orbital
42. n+1 value of 6d orbitals is:
a. 10
b. 08
c. 11
d. 09
43. when 5d orbital completed then entering electrons goes into:
a. 6d
b. 6s
c. 6f
d. 6p
44. The element which has maximum number of unpaired electrons is:
a. Fe26
b. Cr24
c. Cu29
d. Ca20
45. The maximum number of unpaired electrons are present in:
a. Cr=24
b. Fe=26
c. Na=11
d. Ni=28
46. The nature of positive rays depends upon:
a. The nature of residual gas
b. The nature of electrons
c. The nature of discharge tube
d. All of above
47. The velocity of photon is:
a. Equal to square of ots amplitude
b. Independent of its wavelength
c. dependent on its source
d. Dependent of its wavelength
48. Wave number of the light emitted by a certain source is 2 x 106ms-1 then its wavelength will be:
a. 200 m
b. 500 nm
c. 5 x 107m
d. 500 m
49. Rutherford’s model of atom failed because:
a. It did not account for the stability of the atom
b. The atom did not have nucleus electrons
c. There is actually no space between nucleus and electrons
d. It did not account for the attraction between proton and neutrons
50. Bohr’s model of atom is contradicted by:
a. Heisenberg uncertainty principle
b. Planck’s quantum theory
c. Dual nature of mater
d. All of above