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

00:00
Question # 1

The experimental evidences for the existence of atomic nucleus comes from:

Question # 2

The orbitals having n + l = 5 are

Question # 3

The energy of the first electron is helium will be

Question # 4

Charge to mass ratio (e/m) of the electron is determined by

Question # 5

n + l value for 4f will

Question # 6

Which of the following is not a sub-atomic particle

Question # 7

The maximum number of electrons in a subshell for which l = 3 is

Question # 8

Positive particle in discharged tube is produced by ionization of gas molecules, which is caused by

Question # 9

Rutherford's atomic model suggests the existence of

Question # 10

The number of de-electrons retained in Fe2+ (At.No. of Fe = 26) ions is

Question # 11

Mass of simple electron is:

Question # 12

Proton was discovered by:

Question # 13

Schrodinger wave equation describes electron completely because

Question # 14

If the radius of first Bohr orbit be ao, then the radius of third Bohr orbit would be

Question # 15

The size of electronic shell is described by

Question # 16

When electrons revolve in stationary orbits

Question # 17

When an electric current is passed through discharge tube at low pressure, cathode rays are emitted from cathode these rays consist of:

Question # 18

The orbital in Rutherford's model is

Question # 19

When 6s orbital is complete then next electron goes to

Question # 20

Their e/m, ratio resembles with that of electrons

Question # 21

Which of the following orbitals have a dumb bell shape?

Question # 22

Maximum potential energy that an electron can have within the atom is:

Question # 23

Effective magnetic moment of Sc3+ion is

Question # 24

Pauli's principle is applicable to

Question # 25

The uncertainty principle was stated only

Question # 26

Rutherford's planetary like picture of the atomic modal was defective because

Question # 27

In the ground state of an atom the electron is present

Question # 28

If the value of azimuthal quantum number is 3, then values of m the magnetic quantum no. will be

Question # 29

The ratio of the ionization energy of H and Be3+is

Question # 30

Which of the following is not charged particle

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 n + l value for 4f will
A. 2
B. 5
C. 7
D. 9
2 Azimuthal quantum number of last electron of 11Na is
A. 1
B. 2
C. 3
D. 0
3 Photons of yellow colour are ______ energetic than violet colour
A. More
B. Less
C. Equal
D. None
4 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
5 When electrons revolve in stationary orbits
A. There is no change in energy level
B. They vecome stationary
C. They are gaining kinetic energy
D. There is increase in energy
6 Neutrons was discovered by
A. Mosely
B. Milliken
C. Chadwick
D. Ruherford
7 The symbol of the element whose atoms have the outer most electronic configuration 2s22p3is
A. N
B. Li
C. P
D. Na
8 Cathode rays drive a small paddle wheel placed in their path. This observation shows that
A. Cathode rays travel in straight lines
B. Cathode rays are negatively charged
C. Cathode rays produce x-rays
D. Cathode rays are material particles having momentum
9 The order of distance between the various Bohr orbits is
A. r2- r1> r3- r2> r4- r3> ......
B. r1> r2> r2- r3> r4-r3> .....
C. r2-r1= r3- r2= r4- r3> .....
D. r2- r1> r3- r2< r4- r3< ....
10 The wave number of light emitted by a certain source is 2 x 105m. The wavelength of this light will be:
A. 500 NM.
B. 500 M.
C. 200 NM.
D. 5 x 107m

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