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 e.m value for positive rays maximum for:

Question # 2

In the ground state of an atom the electron is present

Question # 3

The radius of first orbit of H-atom is

Question # 4

Azimuthal quantum number of last electron of 11Na is

Question # 5

The credit of discovering neutron goes to

Question # 6

Quantum number value for 2p orbitals are:

Question # 7

1 erg of energy corresponds to

Question # 8

Which of the following is not isoelectronic?

Question # 9

Which quantum number is sufficient to describe the electron is hydrogen atom?

Question # 10

Consider the ground state of Cr atom (Z=24). The numbers of electrons with the azimuthal quantum numbers l = 1 and l = 2 are respectively

Question # 11

Rutherford's atomic model suggests the existence of

Question # 12

Balmer's series is in ______ region

Question # 13

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

Question # 14

Effective magnetic moment of Sc3+ion is

Question # 15

Charge to mass ratio of electron was discovered by:

Question # 16

Pauli's principle is applicable to

Question # 17

What is the packet of energy called?

Question # 18

n + l value for 4f will

Question # 19

The radiations with wavelength shorter than violet light are called

Question # 20

The value of Plank's constant 'h' is

Question # 21

The total number of possible values of magnetic quantum number for the value of l=3 is

Question # 22

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

Question # 23

E = hv is the

Question # 24

In Millikan method for determination of charge on electron the air in the chamber is ionized by

Question # 25

The wave length of electron as wave is 0.5 nm. What is the wave length in meter

Question # 26

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

Question # 27

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

Question # 28

Which one of the following statements is true about discovery of neutrons?

Question # 29

The radius of second Bohr's orbit is

Question # 30

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

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 The atomic number of an element is 35 what is the total number of electrons present in all the p-orbitals of the ground state atom of that element?
A. 6
B. 11
C. 17
D. 23
2 Which of the atoms has 1s2, 2s2, 2px22p1y2p1zconfiguration
A. Nitrogen
B. Carbon
C. Fluorine
D. Oxygen
3 Neutrons was discovered by
A. Mosely
B. Milliken
C. Chadwick
D. Ruherford
4 The quantum number which describe the orientation of the orbitals is
A. Spin quantum number
B. Principle quantum number
C. Azimathal quantum number
D. Magnetic quantum number
5 Which of the following was discovered first:
A. Charge to mass ratio of electrons.
B. Mass of electrons.
C. Charge of electrons.
D. All of above at same time.
6
Question Image
A. Neutrons are attracted by nucleus
B. Neutrons carry out nuclear reactions
C. Neutrons carry no charge
D. Neutrons are electromagnetic radiations
7 With increasing principle quantum number, the energy difference between adjacent energy levels in H atom
A. Decreases
B. Increases
C. Remains constant
D. Decreases for low value of Z and increase for higher value of Z
8 Find the magnetic moment of a divalent ion in aqueous solution if its atomic number is 25
A. 3.0 BM
B. 4.9 BM
C. 5.9 BM
D. 6.9 BM
9 Heaviest particle is
A. Meson
B. Neutron
C. Proton
D. Electron
10 The total values of magnetic quantum number of subshell are five, the subshell is
A. S-subshell
B. P-subshell
C. D-subshell
D. F-subshell

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