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

Charge on electron was discovered by:

Question # 2

Bohr model of atom is contradicted by:

Question # 3

Proton was discovered by:

Question # 4

Number of neutrons in heavy hydrogen atom is

Question # 5

Smallest charge of electricity that has been measured so far is

Question # 6

An electron has principal quantum number 3. The number of its 1 subshell and 2 orbitals would be respectively

Question # 7

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

Question # 8

The uncertainty principle was stated only

Question # 9

Subsidiary quantum number specifies

Question # 10

An electron with n = 3 , l = 2 will be in the sub-shell

Question # 11

Splitting of spectral lines when atoms are subjected to strong electron field is called

Question # 12

Neutron was discovered by:

Question # 13

The energy of the first electron is helium will be

Question # 14

Splitting of spectral lines when atoms are subjected to strong electric field is called:

Question # 15

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

Question # 16

The nature of positive ray depend on:

Question # 17

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

Question # 18

The quantum number which determines the shape of the orbital is

Question # 19

The correct set of quantum numbers (n,l and m) respectively of the unpaired electron of chlorine atom is

Question # 20

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

Question # 21

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

Question # 22

Which is not true with respect to cathode rays?

Question # 23

The electron in an atom

Question # 24

Pauli's principle is applicable to

Question # 25

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

Question # 26

The radius of first orbit of hydrogen atom

Question # 27

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

Question # 28

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

Question # 29

Rutherford's model of atom failed because:

Question # 30

Effective magnetic moment of Sc3+ion is

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 An electron with n = 3 , l = 2 will be in the sub-shell
A. 3p
B. 3d
C. 3f
D. 3s
2 When the electron jumps form second third, fourth orbit to the fist orbit, the transitions are known as
A. Balmer series
B. Lyman series
C. Pfund series
D. Brackett series
3 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< ....
4 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
5 With the reference of w/m ratio of anode rays, the e/m ratio of cathode rays s:
A. Greater.
B. same.
C. Smaller.
D. Not fixed.
6 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
7 Alpha rays consist of:
A. Neutrons.
B. Helium nucleus.
C. Protons.
D. Hydrogen nucleus.
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 limiting line of Blamer series in hydrogen spectrum lies in
A. Visible regions
B. Ultraviolet region
C. Infrared region
D. x-rays region
10 Balmer's series is in ______ region
A. Visible
B. U V
C. I. R.
D. None

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