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- 1. Multiple Choice
Maximum number of electrons in a subshell with l = 3 and n = 4 is
12
9
18
14
- 2. Multiple Choice
The correct set of four quantum numbers for the valence electron of rubidium atom (Z = 37) is
6, 0 , 0. +1/2
5 , 0 , -1, +1/2
5 , 1, 0. +1/2
5 , 0 , 0. +1/2
- 3. Multiple Choice
The conclusion that every additional electron enters the orbital with lowest possible energy has been drawn from
Pauli’s exclusion principle
Hund’s rule
Aufbau principle
de-Broglie’s equation
- 4. Multiple Choice
Bohr’s model of atom is not in agreement with
Line spectra of hydrogen atom
Pauli’s principle
Planck’s theory
Heisenberg’s principle.
- 5. Multiple Choice
In the atomic spectrum of hydrogen, the spectral lines pertaining to electronic transition of n = 4 to n = 2 refers to
Lyman lines
Balmer lines
Paschen lines
Brackett lines
- 6. Multiple Choice
If ionising energy of H atom is 13.6 eV, then the second ionising energy of He should be
13.6 e V
27.2 e V
54.4 e V
Cannot be predicted
- 7. Multiple Choice
The correct electronic configuration of Cr (Z=24) is
[Ar] 3d 5 4s 1
[Ar] 3d 4 4s 2
[Ar] 3d 9 4s 2
[Ar] 3d 10 4s 1
- 8. Multiple Choice
The maximum number of electrons in s, p and d-subshells are
2 in each
2, 4 and 6
2, 6 and 10
2, 6 and 12.
- 9. Multiple Choice
The maximum number of electrons that can be accommodated in dxy orbital is
10
4
1
2
- 10. Multiple Choice
Which d-orbital does not have four lobes?
d x2 -y2
d xy
d yz
d z2
- 11. Multiple Choice
Which shape is associated with the orbital designated by n=2, l=1
spherical
tetrahedral
dumb-bell
pyramidal
- 12. Multiple Choice
If the value of azimuthal quantum number of an electron is 2, then which of the following values of magnetic quantum numbers is not permissible
3
2
0
1
- 13. Multiple Choice
If r is the radius of first orbit, the radius of nth orbit of the H atom will be
r n 2
r n
r/n
r2n 2
- 14. Multiple Choice
For which of the following sets of quantum numbers an electron will have the highest energy?
3, 2, 1, 1/2
4, 2, -1, 1/2
5, 1, 0, -1/2
5, 0, 0, 1/2.
- 15. Multiple Choice
The total number of orbitals in a shell with principal quantum number ‘n’ is
2n
2n2
n2
n+1
- 16. Multiple Choice
Which of the following expressions gives the de-Brogiie relationship ?
λ = h / mv
p = h / mv
λ = h / mp
λ = h / m
- 17. Multiple Choice
Rutherford’s atomic model suggests the existence of
Atom
Nucleus
Mesons
α-particle
- 18. Multiple Choice
Which of the above is violation of Pauli’s exclusion principle ?
A
B
C
D
- 19. Multiple Choice
If the nitrogen atom had electronic configuration 1s7 , it would have energy lower than that of the normal ground state configuration 1s2 2s2 2p3 because the electrons would be closer to the nucleus.
Yet, 1s7 is not observed because it violates.
Heisenberg uncertainty principle
Hund’s rule
Pauli’s exclusion principle
Bohr postulates of stationary orbits.
- 20. Multiple Choice
Radial nodes present in 3s and 2p -orbitals are respectively
0,2
2,0
2,1
1,2
- 21. Multiple Choice
. Rutherford’s experiment, which established the nuclear model of the atom, used a beam of
β - particles, which impinged on a metal foil and got absorbed
γ - rays, which impinged on a metal foil and ejected electrons
helium atoms, which impinged on a metal foil and got scattered
helium nuclei, which impinged on a metal foil and got scattered
- 22. Multiple Choice
identify the person
S N Bose
J C Bose
S Chandrasekhar
Sir C V Raman
- 23. Multiple Choice
The Nobel Prize in Physics 1921 was awarded to Albert Einstein "for his services to Theoretical Physics, and especially for his discovery of the law of
photoelectric effect
special relativity
general relativity
radioactivity
- 24. Multiple Choice
It is the diagram of
1s-orbital
2s-orbital
3s-orbital
3pz-orbital
- 25. Multiple Choice
Violet light has graeter ________ than red light ?
frequency
wavelength
velocity
density
- 26. Multiple Choice
1s2, 2s2, 2p3 represents
Na
N
O
F
- 27. Multiple Choice
1s & 2s orbitals have similar
size
energy
shape
radius
- 28. Multiple Choice
For each metal, there is a characteristic minimum frequency,below which photoelectric effect is not observed. This is called
threshold frequency
Bohr frequency
work function
initial frequency
- 29. Multiple Choice
In which case ejection of photoelectron is the easiest?
Li
Ag
Na
K
- 30. Multiple Choice
"It is impossible to determine simultaneously, the exact
position and exact momentum (or velocity) of an electron." This is the statement of
Hund's Rule
Pauli's Exclusion Principle
Aufbau Principle
Heisenberg’s Uncertainty Principle
- 31. Multiple Choice
ns-orbital has ___________nodes,
n-1
n+1
2n
2n2
- 32. Multiple Choice
This is the boundary surface diagram of
2pz - orbital
2px - orbital
2s - orbital
3dxy - orbital
- 33. Multiple Choice
The orbitals having the same energy are called
isotope
isobar
iso orbital
degenerate
- 34. Multiple Choice
Which subatomic particle is the heaviest?
electron
proton
neutron
positron
- 35. Multiple Choice
The correct electronic configuration of Pd is
[Ar]3d104s0
[Kr]4d95s1
[Kr]4d105s0
[Kr]4d85s2
- 36. Multiple Choice
Millikan's oil drop experiment could find:
charge of electron
charge-to-mass ratio of electron
charge-to-mass ratio of proton
mass of electron
- 37. Multiple Choice
The two electrons occupying the same orbital are distinguished by
Principal Quantum Number
Azimuthal Quantum Number
Magnetic Quantum Number
Spin Quantum Number
- 38. Multiple Choice
The total number of atomic orbitals in 4th energy level of an atom is
16
32
2
14
- 39. Multiple Choice
64Gd has the configuration
[Xe]4f8 6s2
[Xe]4f10
[Xe]4f5 5d3 6s2
[Xe]4f7 5d1 6s2
- 40. Multiple Choice
For which one of the following Bohr's Model is NOT valid ?
Deuteron atom(2H)
He+
Hydrogen atom
Ne+
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