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

Proton was discovered by:

Question # 2

Quantum number values for 2p orbitals are

Question # 3

The radius of first orbit of hydrogen atom

Question # 4

Splitting of spectral lines of the hydrogen atom under the influence or magnetic field is called

Question # 5

Which of the following is not isoelectronic?

Question # 6

With the reference of w/m ratio of anode rays, the e/m ratio of cathode rays s:

Question # 7

The spectrum of He is expected to be similar to that of

Question # 8

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

Question # 9

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 # 10

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

Question # 11

Alpha rays consist of:

Question # 12

Pauli's principle is applicable to

Question # 13

A 4f orbital has

Question # 14

When 3p orbital is complete, the entering electron goes into

Question # 15

The electron in an atom

Question # 16

The spectrum of helium is expected to be similar to that of

Question # 17

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

Question # 18

The principle quantum number describes

Question # 19

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

Question # 20

Rutherford's model of atom failed because:

Question # 21

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

Question # 22

Azimuthal quantum number of last electron of 11Na is

Question # 23

Their e/m, ratio resembles with that of electrons

Question # 24

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

Question # 25

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

Question # 26

Energy of electron in the infinite Bohr orbit of H-atom is

Question # 27

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

Question # 28

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

Question # 29

The number of electrons in the M shell of the element with atomic number 24 is

Question # 30

Rutherford's experiment led to the discovery of

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 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
2 Number of neutrons in heavy hydrogen atom is
A. 0
B. 1
C. 2
D. 3
3 When potassium metal is exposed to violet light
A. Ejection of electrons takes place
B. Ejection of some potassium atoms occurs
C. There is no effect
D. The absorption of electrons takes place
4 The spectrum of helium is expected to be similar to that of
A. H
B. Li+
C. Na
D. He+
5 The value of charge on electron is
A. 1.602 x 10-19coulombs
B. 1.602 x 10-18coulombs
C. 1.602 x 10-17coulombs
D. 1.602 x 10-16 coulombs
6 A 4f orbital has
A. one node
B. two node
C. three node
D. four nodes
7 Which quantum number is sufficient to describe the electron is hydrogen atom?
A. l
B. n
C. m
D. s
8 The energy of the first electron is helium will be
A. -13.6 eV
B. -54.4 eV
C. -5.44 eV
D. zero
9 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
10 The e.m value for positive rays maximum for:
A. Oxygen.
B. Nitrogen.
C. Helium.
D. Hydrogen.

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