Topic: Structure of Atom, Test No.: 09, Total MCQs: 10
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Question 1 |
The total
number of electrons present in all the 's' orbitals, all the 'p' orbitals and
all the 'd' orbitals of cesium ion are respectively
8, 22, 10 | |
10, 24, 20 | |
8, 26, 10 | |
12, 20, 20 |
Question 2 |
The
value of Planck’s constant is 6.63 × 10-34 J s. The velocity of
light is 3.0 × 108 m s-1. Which value is
closest to the wavelength in nanometers of a quantum of light with frequency of
8 × 1015 s-1?
5 × 10-18 | |
4 × 10 | |
3 × 107 | |
2 × 10-25 |
Question 3 |
What is the lowest energy of the spectral line emitted by the hydrogen atom in the Lyman series?
(h = Planck's constant, c = velocity of light, R = Rydberg's constant).
 | |
 | |
 | |
 |
Question 4 |
According to
Bohr’s theory, the angular momentum of an electron in 5th orbit is
25  | |
1.0 | |
10 | |
2.5 |
Question 5 |
The
energy of an electron present in Bohr’s second orbit of hydrogen atom is____.
–1312J
mol–1 | |
–328kJ
mol–1 | |
–328 J
mol–1 | |
–164kJ
mol–1 |
Question 6 |
The energy of
second Bohr orbit of the hydrogen atom is –328 kJ mol–1; hence the
energy of fourth Bohr orbit would be
–41 kJ mol–1 | |
–1312 kJ mol–1 | |
–164 kJ mol–1 | |
–82 kJ mol–1 |
Question 7 |
The number of
electrons and neutrons of an element is 18 and 20 respectively. Its mass number
is
2 | |
37 | |
17 | |
38 |
Question 8 |
The number of
photons emitted per second by a 60 W source of monochromatic light of
wavelength 663 nm is (h = 6.63 × 10–34Js)
4 × 10–20 | |
1.54 × 10–20 | |
3 × 10–20 | |
2 × 10–20 |
Question 9 |
The number of
radial nodes in 3s and 2p orbitals are respectively:
2 and 0 | |
1 and 2 | |
0 and 2 | |
2 and 1 |
Question 10 |
The
number of nodal planes in a px orbital is
1 | |
2 | |
3 | |
0 |
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