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

Electrons in degenerate orbitals are placed in separate orbitals with same spin according to

Question # 2

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

Question # 3

The radius of second Bohr's orbit is

Question # 4

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

Question # 5

The quantum number which describe the orientation of the orbitals is

Question # 6

Which of the following is not isoelectronic?

Question # 7

E = hv is the

Question # 8

The configuration 1s22s22p53s1shows

Question # 9

When cathode rays strike the anode metal X-rays are emitted and not the positive rays because

Question # 10

The energy of the first electron is helium will be

Question # 11

The total number of orbitals possible for the quantum number n is

Question # 12

Which of the following is not a sub-atomic particle

Question # 13

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

Question # 14

The velocity of photon is:

Question # 15

What is the packet of energy called?

Question # 16

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

Question # 17

The size of electronic shell is described by

Question # 18

The four quantum numbers of the valency electron of potassium are

Question # 19

Pauli's principle is applicable to

Question # 20

The charge over mass ratio of electron is:

Question # 21

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

Question # 22

Quantum number value for 2p orbitals are:

Question # 23

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

Question # 24

Sodium chloride imparts a yellow colour to the Bunsen flame. This can be interpreted due to the

Question # 25

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

Question # 26

Neutrons was discovered by

Question # 27

Charge on electron was discovered by:

Question # 28

In Bohr model of hydrogen atom the distance between adjacent orbits increases away from the nucleus, the energy difference between the orbits

Question # 29

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 # 30

The mass of the neutron is of the order of

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 If the value of azimuthal quantum number is 3, then values of m the magnetic quantum no. will be
A. 0, 1, 2, 3
B. +3, +2, +1, -1, -2, -3
C. 0, -1, -2 ,-3
D. -3, 0, +3
2 In Bohr model of hydrogen atom the distance between adjacent orbits increases away from the nucleus, the energy difference between the orbits
A. Increases
B. Decreases
C. Reaming same
D. Orbits coincide
3 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
4 The total number of orbitals possible for the quantum number n is
A. n
B. n2
C. 2n
D. 2n2
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 When the electron jumps form third, fourth, fifth orbits to the second orbit, the transitions are known as
A. Paschen
B. Pfund
C. Balmer
D. Brackett
7 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
8 The orbitals having n + l = 5 are
A. 2p, 3d,3s
B. 3p, 3d, 5s
C. 3s, 4p, 4d
D. 5s, 4p, 3d
9 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
10 Electrons arranged in orbitals according to the increasing order of their n + l values, this rule is named as
A. Hund's rule
B. Heisenberg's principle
C. Paulit exclusion principle
D. Auf bau principle

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