ECAT Pre Engineering Chemistry Chapter 5 MCQ Test With Answer

MCQ's Test For ECAT Chemistry Chapter 5 Atomic Structure

Try The MCQ's Test For ECAT Chemistry Chapter 5 Atomic Structure

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ECAT Chemistry Chapter 5 Atomic Structure

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Question # 1

The rules which describe the distribution of electron in atomic energy levels are Auf-ban principle, Pauli's exclusion principle. Hunds rule. The pauli exclusion principle refers to the

Question # 2

Charge of an electron is:

Question # 3

The wave number of the light emitted by a certain source is 2 x 106m-1. The wavelength of this light will be

Question # 4

The arrangement of subshells in the ascending order of their energy on complete filing of 4f subshell the entering electrons goes to

Question # 5

Which one of the following particles has amass 1/1836 time, that of hydrogen?

Question # 6

The range of visible spectrum is

Question # 7

The electronic configuration of an atom/ion can be defined by the following

Question # 8

For a 3P subshell the set of principle and azimuthal quantum number is

Question # 9

The principle quantum number describes

Question # 10

The uncertainty principle was stated only

Question # 11

In the ground state of an atom, the electron is present

Question # 12

In the ground state of an atom the electron is present

Question # 13

Photons of yellow colour are ______ energetic than violet colour

Question # 14

Energy of electron in first orbit of H atom is

Question # 15

The radius of first orbit of hydrogen atom

Question # 16

The valence orbital configuration of an element with atomic number 23 is

Question # 17

The number of neutrons in the element 94Be is

Question # 18

Electrons in degenerate orbitals are placed in separate orbitals with same spin according to

Question # 19

The divisibility of atom was shown by

Question # 20

Smallest charge of electricity that has been measured so far is

Question # 21

The orbitals having n + l = 5 are

Question # 22

The mass of the neutron is of the order of

Question # 23

The four quantum numbers of the valency electron of potassium are

Question # 24

The quantum number which describe the orientation of the orbitals is

Question # 25

Light emitted from a source has its wave length 500nm, then its wave number will be

Question # 26

For principle quantum number n=4, the total number of orbitals having l = 3 is

Question # 27

Four d-orbitals contain four lobes while fifth contains only two lobes the orbital is

Question # 28

Anode is the surface on which probability of finding electron is:

Question # 29

The charge over mass ratio of electron is:

Question # 30

The de-Brogile wavelength of a particle with mass 1g and velocity 100 m/s is

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 Which of the atoms has 1s2, 2s2, 2px22p1y2p1zconfiguration
A. Nitrogen
B. Carbon
C. Fluorine
D. Oxygen
2 No cathode rays are produced in the discharged tube when gas is under ordinary pressure even if voltage of 5000 to 10000 is applies. This reason is
A. Voltage is low
B. Discharge tube is not coloured
C. Gas does not conduct current under ordinary pressure
D. Temperature low
3 The arrangement of subshells in the ascending order of their energy on complete filing of 4f subshell the entering electrons goes to
A. 5s
B. 5p
C. 5d
D. 5f
4 The orbitals having n + l = 5 are
A. 2p, 3d,3s
B. 3p, 3d, 5s
C. 3s, 4p, 4d
D. 5s, 4p, 3d
5 The total number of orbitals in a shell with principal quantum number 'n' is
A. 2n
B. 2n2
C. n2
D. n + 1
6 The wave number of the line emitted is 109.678 x 105m-1in the Lyman series when electron transition occurs
7 Pauli's principle is applicable to
A. Degenerate orbits
B. Two electrons in the same orbital
C. One electron
D. None
8 The order of frequency of the following radiations unltraviolet, visible, infrared and microwave is
A. Microwave > infrared > visible > ultraviolet
B. Visible > ultraviolet > microwave > infrared
C. Ultraviolet > visible > infrared > microwave
D. Infrared > microwave > ultraviolet > visible
9 The nature of positive rays depend on:
A. Nature of discharge tube.
B. Nature of resident gas.
C. Nature of electrode.
D. All of above.
10 Which one of the following statements is true about discovery of neutrons?
A. These particles were formed by the bombardment of Alpha-particles on Beryllium.
B. These particles are formed by the spiting of alpha-particles.
C. These particles were discovered by natural radioactivity.
D. None of above.

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