1 |
Which of the following orbitals have a dumb bell shape? |
s
p
d
f
|
2 |
The total number of orbitals in a shell with principal quantum number 'n' is |
2n
2n<sup>2</sup>
n<sup>2</sup>
n + 1
|
3 |
Rutherford's experiment led to the discovery of |
Nucleus
Electron
Proton
alpha particle
|
4 |
Azimuthal quantum number of last electron of 11Na is |
1
2
3
0
|
5 |
For which of the following sets of quantum numbers and electron will have the highest energy? |
3,2,1,1/2
4,2,-1,1/2
4,1,0,-1/2
5,0,0,1/2
|
6 |
The radius of second Bohr's orbit is |
0.053 nm
0.053/4 nm
0.053 x 4 nm
0.053 x 20 nm
|
7 |
The electron in an atom |
moves randomly around the nucleus
has fixed space around the nucleus
is stationary in various energy levels
moves around its nucleus in definite energy levels
|
8 |
If the value of principal quantum number is 3. the total possible values for magnetic quantum number will be |
1
4
9
12
|
9 |
The total number of possible values of magnetic quantum number for the value of l=3 is |
3
1
5
7
|
10 |
The electronic configuration of an atom/ion can be defined by the following |
Aufbau principle
Pauli's exclusion principle
Hund's Rule
All the above
|
11 |
Number of neutrons in heavy hydrogen atom is |
0
1
2
3
|
12 |
The number of spherical nodes in 3p orbitals are |
One
Three
Non
Two
|
13 |
The spectrum of helium is expected to be similar to that of |
H
Li<sup>+</sup>
Na
He<sup>+</sup>
|
14 |
Subsidiary quantum number specifies |
size of orbital
shape of orbital
orientations of orbitals
Nuclear stability
|
15 |
Sodium chloride imparts a yellow colour to the Bunsen flame. This can be interpreted due to the |
low ionization energy of sodium
sublimation of metallic sodium to give yellow vapour
emission of excess energy absorbed as a radiation in the visible region as a radiation in the visible region
photosenitivity
|
16 |
The number of neutrons in the element 94Be is |
4
5
9
13
|
17 |
The valence orbital configuration of an element with atomic number 23 is |
3d<sup>5</sup>
3d<sup>3</sup>, 4s<sup>2</sup>
3d<sup>3</sup>, 4s<sup>1</sup>, 4p<sup>1</sup>
3d<sup>2</sup>,4s<sup>2</sup>,4p<sup>1</sup>
|
18 |
Which quantum number is sufficient to describe the electron is hydrogen atom? |
l
n
m
s
|
19 |
When electrons revolve in stationary orbits |
There is no change in energy level
They vecome stationary
They are gaining kinetic energy
There is increase in energy
|
20 |
The symbol of the element whose atoms have the outer most electronic configuration 2s22p3is |
N
Li
P
Na
|
21 |
The number of electrons in the M shell of the element with atomic number 24 is |
24
12
13
8
|
22 |
The maximum number of electrons in a subshell for which l = 3 is |
14
10
8
4
|
23 |
The ratio of the ionization energy of H and Be3+is |
1 : 1
1 : 3
1 : 9
1 : 16
|
24 |
The mass of the neutron is of the order of |
10<sup>-23 </sup>kg
10<sup>-24</sup>kg
10<sup>-26</sup>kg
10<sup>-27</sup>kg
|
25 |
The credit of discovering neutron goes to |
Rutherford
Langmuir
Chadwick
Austen
|
26 |
With increasing principle quantum number, the energy difference between adjacent energy levels in H atom |
Decreases
Increases
Remains constant
Decreases for low value of Z and increase for higher value of Z
|
27 |
When the electron jumps form second third, fourth orbit to the fist orbit, the transitions are known as |
Balmer series
Lyman series
Pfund series
Brackett series
|
28 |
When the electron jumps form third, fourth, fifth orbits to the second orbit, the transitions are known as |
Paschen
Pfund
Balmer
Brackett
|
29 |
Photons of yellow colour are ______ energetic than violet colour |
More
Less
Equal
None
|
30 |
The quantum number which describe the orientation of the orbitals is |
Spin quantum number
Principle quantum number
Azimathal quantum number
Magnetic quantum number
|