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 de-Brogile wavelength of a particle with mass 1g and velocity 100 m/s is

Question # 2

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

Question # 3

Cathode rays emitted from cathode are

Question # 4

The four quantum numbers of the valency electron of potassium are

Question # 5

The energy of the first electron is helium will be

Question # 6

Which one of the following particles has amass 1/1836 time, that of hydrogen?

Question # 7

The electronic configuration of an atom/ion can be defined by the following

Question # 8

e/m of cathode rays is same but for positive rays e/m changes by changing gas in the discharge tube because

Question # 9

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

Question # 10

Smallest charge of electricity that has been measured so far is

Question # 11

The size of electronic shell is described by

Question # 12

When electrons revolve in stationary orbits

Question # 13

The orbitals having n + l = 5 are

Question # 14

Quantum number value for 2p orbitals are:

Question # 15

The wave number of the line emitted is 109.678 x 105m-1in the Lyman series when electron transition occurs

Question # 16

When 6d orbital is complete, the entering electron goes into:

Question # 17

The nature of the positive rays depend on

Question # 18

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

Question # 19

Which of the following is not a sub-atomic particle

Question # 20

When potassium metal is exposed to violet light

Question # 21

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

Question # 22

In the ground state of an atom the electron is present

Question # 23

An orbital can accommodate maximum two electrons with opposite spins according to

Question # 24

A 4f orbital has

Question # 25

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

Question # 26

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

Question # 27

Mass of simple electron is:

Question # 28

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

Question # 29

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

Question # 30

Schrodinger wave equation describes electron completely because

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 Spectrum of white light is continuous becuase
A. Colors separated by dark spaces
B. There are no boundary lines between the colours
C. The radiations are in infrared region
D. The radiatins fall in ultraviolet region
2 Quantum number value for 2p orbitals are:
A. n=2 ,l=1
B. n=1 ,l=2
C. n= ,l=0
D. n=2 ,l=0
3 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
4 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
5 The energy of ionization of an atom is the energy difference between orbital
6 An electron with n = 3 , l = 2 will be in the sub-shell
A. 3p
B. 3d
C. 3f
D. 3s
7 Electrons in degenerate orbitals are placed in separate orbitals with same spin according to
A. Hund's rule
B. Pauli exclusion principle
C. Aufbau principle
D. Mosley's law
8 Smallest charge of electricity that has been measured so far is
A. Charge on a-rays
B. Charge on electron (1.602 x 10-19C)
C. Charge on x-rays
D. Charge on gamma rays
9 Rutherford's planetary like picture of the atomic modal was defective because
A. It did not describe the quantity of positive charge
B. It did not explain the repulsion of protons within the nucleus
C. No empty space between nucleus and the electrons
D. Moving electron should radiate energy
10 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

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