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question_answer1)
Positive ions are formed from the neutral atom by the
A)
Increase of nuclear charge done
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B)
Gain of protons done
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C)
Loss of electrons done
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D)
Loss of protons done
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question_answer2)
The size of nucleus is measured in
A)
amu done
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B)
Angstrom done
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C)
Fermi done
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D)
cm done
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question_answer3)
The average distance of an electron in an atom from its nucleus is of the order of
A)
\[{{10}^{6}}m\] done
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B)
\[{{10}^{-6}}m\] done
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C)
\[{{10}^{-10}}m\] done
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D)
\[{{10}^{-15}}m\] done
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question_answer4)
If W is atomic weight and N is the atomic number of an element, then
A)
Number of \[{{e}^{-1}}=W-N\] done
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B)
Number of \[_{0}{{n}^{1}}=W-N\] done
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C)
Number of \[_{1}{{H}^{1}}=W-N\] done
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D)
Number of \[_{0}{{n}^{1}}=N\] done
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question_answer5)
Which of the following particles has more electrons than neutrons
A)
\[C\] done
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B)
\[{{F}^{-}}\] done
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C)
\[{{O}^{-2}}\] done
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D)
\[A{{l}^{+3}}\] done
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question_answer6)
The nucleus of the element \[_{21}{{E}^{45}}\] contains
A)
45 protons and 21 neutrons done
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B)
21 proto.ns and 24 neutrons done
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C)
21 protons and 45 neutrons done
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D)
24 protons and 21 neutrons done
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question_answer7)
The nitrogen atom has 7 protons and 7 electrons, the nitride ion \[({{N}^{3-}})\]will have
A)
7 protons and 10 electrons done
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B)
4 protons and 7 electrons done
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C)
4 protons and 10 electrons done
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D)
10 protons and 7 electrons done
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question_answer8)
When atoms are bombarded with alpha particles, only a few in million suffer deflection, others pass out undeflected. This is because
A)
The force of repulsion on the moving alpha particle is small done
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B)
The force of attraction on the alpha particle to the oppositely charged electrons is very small done
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C)
There is only one nucleus and large number of electrons done
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D)
The nucleus occupies much smaller volume compared to the volume of the atom done
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question_answer9)
When \[\beta \]-particles are sent through a tin metal foil, most of them go straight through the foil as
A)
\[\beta \]-particles are much heavier than electrons done
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B)
\[\beta \]-particles are positively charged done
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C)
Most part of the atom is empty space done
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D)
\[\beta \]-particles move with high velocity done
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question_answer10)
The radius of the nucleus is related to the mass number \[A\] by
A)
\[R={{R}_{o}}{{A}^{1/2}}\] done
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B)
\[R={{R}_{o}}A\] done
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C)
\[R={{R}_{o}}{{A}^{2}}\] done
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D)
\[R={{R}_{o}}{{A}^{1/3}}\] done
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question_answer11)
The mass of a photon with a wavelength equal to \[1.54\times {{10}^{-8}}cm\] is
A)
\[0.8268\times {{10}^{-34}}kg\] done
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B)
\[1.2876\times {{10}^{-33}}kg\] done
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C)
\[1.4285\times {{10}^{-32}}kg\] done
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D)
\[1.8884\times {{10}^{-32}}kg\] done
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question_answer12)
Which of the following transitions have minimum wavelength
A)
\[{{n}_{4}}\to {{n}_{1}}\] done
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B)
\[{{n}_{2}}\to {{n}_{1}}\] done
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C)
\[{{n}_{4}}\to {{n}_{2}}\] done
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D)
\[{{n}_{3}}\to {{n}_{1}}\] done
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question_answer13)
What will be de-Broglie wavelength of an electron moving with a velocity of \[1.2\times {{10}^{5}}\,m{{s}^{-1}}\]
A)
\[6.068\times {{10}^{-9}}\] done
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B)
\[3.133\times {{10}^{-37}}\] done
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C)
\[6.626\times {{10}^{-9}}\] done
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D)
\[6.018\times {{10}^{-7}}\] done
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question_answer14)
The de-Broglie equation applies
A)
To electrons only done
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B)
To neutrons only done
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C)
To protons only done
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D)
All the material object in motion done
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question_answer15)
The possibility of finding an electron in an orbital was conceived by
A)
Rutherford done
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B)
Bohr done
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C)
Heisenberg done
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D)
Schrodinger done
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question_answer16)
For an electron if the uncertainty in velocity is \[\Delta \nu \], the uncertainty in its position \[(\Delta x)\] is given by
A)
\[\frac{hm}{4\pi \Delta \nu }\] done
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B)
\[\frac{4\pi }{hm\Delta \nu }\] done
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C)
\[\frac{h}{4\pi m\Delta \nu }\] done
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D)
\[\frac{4\pi \ m}{h\ .\ \Delta \nu }\] done
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question_answer17)
The electronic configuration of silver atom in ground state is
A)
\[[Kr]3{{d}^{10}}\,4{{s}^{1}}\] done
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B)
\[[Xe]\,4{{f}^{14}}5{{d}^{10}}6{{s}^{1}}\] done
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C)
\[[Kr]\,4{{d}^{10}}5{{s}^{1}}\] done
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D)
\[[Kr]\,4{{d}^{9}}5{{s}^{2}}\] done
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question_answer18)
The number of electrons in the valence shell of calcium is
A)
6 done
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B)
8 done
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C)
2 done
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D)
4 done
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question_answer19)
The number of radial nodes of 3s and 2p orbitals are respectively.
A)
2, 0 done
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B)
0, 2 done
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C)
1, 2 done
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D)
2, 1 done
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question_answer20)
Ions which have the same electronic configuration are those of
A)
Lithium and sodium done
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B)
Sodium and potassium done
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C)
Potassium and calcium done
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D)
Oxygen and chlorine done
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question_answer21)
If an electron has spin quantum number of \[+\frac{1}{2}\] and a magnetic quantum number of \[-1\], it cannot be presented in an
A)
\[d\]-orbital done
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B)
\[f\]-orbital done
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C)
\[p\]-orbital done
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D)
\[s\]-orbital done
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question_answer22)
What is the electronic configuration of \[C{{u}^{2+}}(Z=29)\] of least position
A)
\[[Ar]\,4{{s}^{1}}3{{d}^{8}}\] done
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B)
\[[Ar]\,4{{s}^{2}}3{{d}^{10}}4{{p}^{1}}\] done
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C)
\[[Ar]\,4{{s}^{1}}3{{d}^{10}}\] done
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D)
\[[Ar]\,3{{d}^{9}}\] done
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question_answer23)
Which of the following set of quantum numbers is possible
A)
\[n=3;\,\,l=2;\,\,m=2\] and \[s=+\frac{1}{2}\] done
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B)
\[n=3;\,\,l=4;\,\,m=0\] and \[s=-\frac{1}{2}\] done
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C)
\[n=4;\,l=0;\,\,m=2\] and \[s=+\frac{1}{2}\] done
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D)
\[n=4;\,\,l=4;\,\,m=3\] and \[s=+\frac{1}{2}\] done
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question_answer24)
Which of the following sets of quantum numbers is correct for an electron in \[4f\] orbital
A)
\[n=4,\,l=3,\,m=+1,\,s=+\frac{1}{2}\] done
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B)
\[n=4,\,l=4,\,m=-4,\,s=-\frac{1}{2}\] done
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C)
\[n=4,\,l=3,\,m=+4,\,s=+\frac{1}{2}\] done
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D)
\[n=3,\,l=2,\,m=-2,\,s=+\frac{1}{2}\] done
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question_answer25)
The maximum number of electrons which each sub-shell can occupy is
A)
\[2{{n}^{2}}\] done
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B)
\[2n\] done
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C)
\[2(2l+1)\] done
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D)
\[(2l+1)\] done
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question_answer26)
The energy of an electron of \[2{{p}_{y}}\] orbital is
A)
Greater than that of \[2{{p}_{x}}\] orbital done
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B)
Less than that of \[2{{p}_{x}}\] orbital done
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C)
Equal to that of \[2s\] orbital done
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D)
Same as that of \[2{{p}_{z}}\] orbital done
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question_answer27)
Orbital angular momentum for a d-electron is
A)
\[\frac{6h}{2\pi }\] done
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B)
\[\frac{\sqrt{6}\,h}{2\pi }\] done
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C)
\[\frac{12h}{2\pi }\] done
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D)
\[\frac{\sqrt{12}\,h}{2\pi }\] done
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question_answer28)
Which is correct statement about proton
A)
Proton is nucleus of deuterium done
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B)
Proton is ionized hydrogen molecule done
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C)
Proton is ionized hydrogen atom done
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D)
Proton is \[\alpha \]-particle done
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question_answer29)
The proton and neutron are collectively called as
A)
Deutron done
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B)
Positron done
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C)
Meson done
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D)
Nucleon done
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question_answer30)
An atom has 26 electrons and its atomic weight is 56. The number of neutrons in the nucleus of the atom will be
A)
26 done
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B)
30 done
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C)
36 done
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D)
56 done
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question_answer31)
The number of electrons and neutrons of an element is 18 and 20 respectively. Its mass number is
A)
17 done
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B)
37 done
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C)
2 done
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D)
38 done
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question_answer32)
Which among the following species have the same number of electrons in its outermost as well as penultimate shell
A)
\[M{{g}^{2+}}\] done
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B)
\[{{O}^{2-}}\] done
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C)
\[{{F}^{-}}\] done
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D)
\[C{{a}^{2+}}\] done
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question_answer33)
Experimental evidence for the existence of the atomic nucleus comes from
A)
Millikan's oil drop experiment done
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B)
Atomic emission spectroscopy done
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C)
The magnetic bending of cathode rays done
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D)
Alpha scattering by a thin metal foil done
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question_answer34)
If electron falls from \[n=3\] to \[n=2\], then emitted energy is
A)
\[10.2eV\] done
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B)
\[12.09eV\] done
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C)
\[1.9eV\] done
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D)
\[0.65eV\] done
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question_answer35)
Wavelength of spectral line emitted is inversely proportional to
A)
Radius done
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B)
Energy done
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C)
Velocity done
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D)
Quantum number done
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question_answer36)
What is the de-Broglie wavelength associated with the hydrogen electron in its third orbit
A)
\[9.96\times {{10}^{-10}}cm\] done
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B)
\[9.96\times {{10}^{-8}}cm\] done
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C)
\[9.96\times {{10}^{4}}cm\] done
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D)
\[9.96\times {{10}^{8}}cm\] done
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question_answer37)
If uncertainty in the position of an electron is zero, the uncertainty in its momentum would be
A)
Zero done
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B)
\[<\frac{h}{2\lambda }\] done
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C)
\[>\frac{h}{2\lambda }\] done
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D)
Infinite done
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question_answer38)
The two electrons in K sub-shell will differ in
A)
Principal quantum number done
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B)
Azimuthal quantum number done
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C)
Magnetic quantum number done
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D)
Spin quantum number done
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question_answer39)
The angular momentum of an electron depends on
A)
Principal quantum number done
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B)
Azimuthal quantum number done
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C)
Magnetic quantum number done
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D)
All of these done
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question_answer40)
In a multi-electron atom, which of the following orbitals described by the three quantum members will have the same energy in the absence of magnetic and electric fields |
(1) \[n=1,\,l=0,\,m=0\] |
(2) \[n=2,\,l=0,\,m=0\] |
(3) \[n=2,\,l=1,\,m=1\] |
(4) \[n=3,\,l=2,\,m=0\] |
(5) \[n=3,\,l=2,\,m=0\] |
A)
(1) and (2) done
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B)
(2) and (3) done
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C)
(3) and (4) done
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D)
(4) and (5) done
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