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Online Tests
ECAT Chemistry Chapter 5 Atomic Structure Online Test MCQs With Answers
Question # 1
Anode is the surface on which probability of finding electron is:
Choose an answer
50%
Less than 10%.
More than 95%.
Zero.
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Question # 2
A 4f orbital has
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one node
two node
three node
four nodes
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Question # 3
The third line of the Balmer series, in the emission spectrum of the hydrogen atom,is due to the transition from the
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Fourth Bohr orbit to the first Bohr orbit
Fifth Bohr orbit to the second Bohr orbit
Sixth Bohr orbit to the third Bohr orbit
Seventh Bohr orbit to the third Bohr orbit
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Question # 4
Which of the following was discovered first:
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Charge to mass ratio of electrons.
Mass of electrons.
Charge of electrons.
All of above at same time.
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Question # 5
Azimuthal quantum number of last electron of
11
Na is
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1
2
3
0
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Question # 6
The size of electronic shell is described by
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Azimuthal Q. no
Magnetic Q.No
Spin Q. No
Principle Q. No
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Question # 7
The orbitals having n + l = 5 are
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2p, 3d,3s
3p, 3d, 5s
3s, 4p, 4d
5s, 4p, 3d
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Question # 8
Their e/m, ratio resembles with that of electrons
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Alpha rays
Beta rays
Gamma rays
X-rays
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Question # 9
Positive particle in discharged tube is produced by ionization of gas molecules, which is caused by
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Gas molecules collide with anode
Gas molecules are at high temperature
Gas molecules produce X-rays
Cathode rays remove electrons from gas molecules
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Question # 10
The order of frequency of the following radiations unltraviolet, visible, infrared and microwave is
Choose an answer
Microwave > infrared > visible > ultraviolet
Visible > ultraviolet > microwave > infrared
Ultraviolet > visible > infrared > microwave
Infrared > microwave > ultraviolet > visible
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Question # 11
Rutherford's experiment led to the discovery of
Choose an answer
Nucleus
Electron
Proton
alpha particle
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Question # 12
Neutrons was discovered by
Choose an answer
Mosely
Milliken
Chadwick
Ruherford
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Question # 13
The velocity of photon is:
Choose an answer
Independent of its wavelength.
Depends on its wavelength.
Equal to square of its amplitude
Depends on its source.
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Question # 14
Effective magnetic moment of Sc
3+
ion is
Choose an answer
1.73
0
5.92
2.83
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Question # 15
e/m of cathode rays is same but for positive rays e/m changes by changing gas in the discharge tube because
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Cathode rays are small sized particles
Cathode rays have same charge
Nature of cathode rays same for all gasses, but masses of nuclei are different for different gases
Temperature of cathode rays higher
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Question # 16
If the value of azimuthal quantum number is 3, then values of m the magnetic quantum no. will be
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0, 1, 2, 3
+3, +2, +1, -1, -2, -3
0, -1, -2 ,-3
-3, 0, +3
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Question # 17
The uncertainty principle was stated only
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De Brogilie
Heinsenberg
Einstein
Schrodinger
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Question # 18
The correct set of quantum numbers (n,l and m) respectively of the unpaired electron of chlorine atom is
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2,1,0
2,1,1
3,1,1
3,2,1
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Question # 19
The energy of ionization of an atom is the energy difference between orbital
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Question # 20
The range of visible spectrum is
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300 - 600 nm
600 - 900 nm
400 - 750 nm
100 - 300 nm
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Question # 21
If the value of principal quantum number is 3. the total possible values for magnetic quantum number will be
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1
4
9
12
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Question # 22
The total values of magnetic quantum number of subshell are five, the subshell is
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S-subshell
P-subshell
D-subshell
F-subshell
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Question # 23
In the atomic emission spectrum the lines which appear bright, appear dark in absorption spectrum because
Choose an answer
The radiations emitted in emission spectrum are absorbed in absorption spectrum
Atomic emission spectrum is continuous
Atomic absorption spectrum is continuous
Distance between the lines increases
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Question # 24
Quantum number value for 2p orbitals are:
Choose an answer
n=2 ,l=1
n=1 ,l=2
n= ,l=0
n=2 ,l=0
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Question # 25
The energy of the first electron is helium will be
Choose an answer
-13.6 eV
-54.4 eV
-5.44 eV
zero
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Question # 26
The mass of the neutron is of the order of
Choose an answer
10
-23
kg
10
-24
kg
10
-26
kg
10
-27
kg
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Question # 27
When electrons revolve in stationary orbits
Choose an answer
There is no change in energy level
They vecome stationary
They are gaining kinetic energy
There is increase in energy
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Question # 28
When cathode rays strike the anode metal X-rays are emitted and not the positive rays because
Choose an answer
Cathode rays are material particles
Cathode rays knock out electrons from anode, which emit X-rays when outer electron take their place
Cathode rays are absorbed by the nucleus
Cathode rays become heated
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Question # 29
Which of the following is not a sub-atomic particle
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Electron
Proton
Neutron
Deuteron
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Question # 30
The nature of positive ray depend on:
Choose an answer
The nature of electrode.
The nature of discharge tube.
The nature of residual gas.
All of above.
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Question # 31
The charge over mass ratio of electron is:
Choose an answer
1.6 x 10
-1
C Kg
-1
9.1 x 10
-31
C Kg
-1
1.7588 x 10
11
C Kg
-1
6.62 x 10
-34
C Kg
-1
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