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

Question # 2

Which of the following is not a sub-atomic particle

Question # 3

Which of the following is not a property of cathode rays

Question # 4

The symbol of the element whose atoms have the outer most electronic configuration 2s22p3is

Question # 5

Negatively charged particle nature of cathode rays was first demonstrated in 1895 by:

Question # 6

Pauli's principle is applicable to

Question # 7

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

Question # 8

The uncertainty principle was stated only

Question # 9

In the atomic emission spectrum the lines which appear bright, appear dark in absorption spectrum because

Question # 10

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

Question # 11

Subsidiary quantum number specifies

Question # 12

Which have better penetrating power

Question # 13

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

Question # 14

When 6s orbital is complete then next electron goes to

Question # 15

Bohr model of atom is contradicted by:

Question # 16

Charge of an electron is:

Question # 17

The orbital in Rutherford's model is

Question # 18

When the electron jumps form second third, fourth orbit to the fist orbit, the transitions are known as

Question # 19

1 erg of energy corresponds to

Question # 20

Neutrons was discovered by

Question # 21

Find the magnetic moment of a divalent ion in aqueous solution if its atomic number is 25

Question # 22

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 # 23

When the 6d orbital is completed the entering electron goes into

Question # 24

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

Question # 25

Smallest charge of electricity that has been measured so far is

Question # 26

If the value of principal quantum number is 3. the total possible values for magnetic quantum number will be

Question # 27

Electrons arranged in orbitals according to the increasing order of their n + l values, this rule is named as

Question # 28

With increasing principle quantum number, the energy difference between adjacent energy levels in H atom

Question # 29

Effective magnetic moment of Sc3+ion is

Question # 30

A 4f orbital has

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 Effective magnetic moment of Sc3+ion is
A. 1.73
B. 0
C. 5.92
D. 2.83
2 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
3 In the ground state of an atom the electron is present
A. In the nucleus
B. In the second shell
C. Nearest to the nucleus
D. Farthest from the nucleus
4 An electron has principal quantum number 3. The number of its 1 subshell and 2 orbitals would be respectively
A. 3 and 5
B. 3 and 7
C. 3 and 9
D. 2 and 5
5 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
6 The quantum number which describes the shape of the orbital is
A. Principle quantum number
B. Spin quantum number
C. Azimathal quantum number
D. Magnetic quantum number
7 An electron with n = 3 , l = 2 will be in the sub-shell
A. 3p
B. 3d
C. 3f
D. 3s
8 Number of neutrons in heavy hydrogen atom is
A. 0
B. 1
C. 2
D. 3
9
Question Image
A. s
B. p
C. d
D. f
10 Positive particle in discharged tube is produced by ionization of gas molecules, which is caused by
A. Gas molecules collide with anode
B. Gas molecules are at high temperature
C. Gas molecules produce X-rays
D. Cathode rays remove electrons from gas molecules

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