# The mass and charge of one mole of electrons are, respectively: 1. 5.48 × ${10}^{-7}$ kg, 9.65 C,  2. 5.48 × ${10}^{-7}$ C, 1.098 x 1027 3. 5.48 × ${10}^{-7}$ kg, 9.65 × ${10}^{4}$ C 4. 9.65 × ${10}^{4}$ C, 1.098 x 1027

Subtopic:  Number of Electron, Proton & Neutron |
72%
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The maximum number of neutrons are present in the nuclei of:

$1.$ ${\mathrm{O}}_{8}^{16}$
$2.$ ${\mathrm{Mg}}_{12}^{24}$
$3.$ ${\mathrm{Fe}}_{26}^{56}$
$4.$ ${\mathrm{Sr}}_{38}^{88}$

Subtopic:  Number of Electron, Proton & Neutron |
92%
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The complete symbol for the atom with the given atomic number (Z) and atomic mass (A) would be, respectively :

 i. Z = 17 , A = 35. ii. Z = 92 , A = 233. iii. Z = 4 , A = 9.

1.  ${}_{4}{}^{9}\mathrm{Be}$   ${}_{92}{}^{233}\mathrm{U}$     ${}_{4}{}^{9}\mathrm{Be}$

2.  ${}_{17}{}^{35}\mathrm{Cl}$    ${}_{92}{}^{233}\mathrm{U}$    ${}_{4}{}^{9}\mathrm{Be}$

3.  ${}_{4}{}^{9}\mathrm{Be}$    ${}_{17}{}^{35}\mathrm{Cl}$     ${}_{92}{}^{233}\mathrm{U}$

4. ${}_{92}{}^{233}\mathrm{U}$    ${}_{4}{}^{9}\mathrm{Be}$    ${}_{17}{}^{35}\mathrm{Cl}$

Subtopic:  Number of Electron, Proton & Neutron |
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Yellow light emitted from a sodium lamp has a wavelength (λ) of 580 nm.

The frequency (ν) and wave number of this yellow light would be, respectively:

1. 517 x 1014 s-1 , 172 x 106 m-1

2. 6.17 x 1014 s-1 , 1.72 x 106 m-1

3. 4.17 x 1014 s-1 , 2.72 x 106 m-1

4. 5.17 x 1014 s-1 , 1.72 x 106 m-1

Subtopic:  Introduction of Atomic Structure |
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The energy of the photon with a frequency of 3×1015 Hz is :

1. 1.988 × ${10}^{-18}$ J
2. 1.588 × ${10}^{-18}$ J
3. 1.288 × ${10}^{-18}$ J
4. 2.988 × ${10}^{-18}$ J

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A photon of wavelength 4 × 10–7 m strikes a metal surface, the work function of the metal being 2.13 eV.  The kinetic energy of emission would be:

 1 0.97 eV 2 97 eV 3 4.97 × ${10}^{-19}$ eV 4 5.84 × 105 eV

Subtopic:  Photo Electric Effect |
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The wavelength of the light emitted when the electron returns to the ground state in the H atom, from n = 5 to n = 1, would be: (The ground-state electron energy is –2.18 × 10-18 j

1. Wavelength = 9.498 x 10-8 km
2. Wavelength = 12.498 x 10-8 m
3. Wavelength = 9.498 x 10-8 m
4. Wavelength = 9.498 x 10-8 cm

Subtopic:  Planck's Theory |
63%
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The possible values of n, l, and m for the electron present in 3d would be respectively:

1. n = 3, l = 1, m = – 2, – 1, 3, 1, 2

2. n = 3, l = 3, m = – 2, – 1, 0, 1, 2

3. n = 3, l = 2, m = – 2, – 1, 0, 1, 2

4. n = 5, l = 2, m = – 2, – 1, 0, 1, 2

Subtopic:  Shell & Subshell |
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The number of electrons in the species ${\mathrm{H}}_{2}^{+}$ $,$ ${\mathrm{H}}_{2}$ $,$ ${\mathrm{O}}_{2}^{+}$,  are respectively:

1. 15, 2, 1

2. 15, 1, 2

3. 1, 2, 15

4. 2, 1, 15

Subtopic:  Number of Electron, Proton & Neutron |
92%
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Orbital that does not exist:

 1 6p 2 2s 3 3f 4 2p

Subtopic:  Shell & Subshell |
89%
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