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

For which of the following sets of quantum numbers and electron will have the highest energy?

Question # 2

The nature of the positive rays depend on

Question # 3

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

Question # 4

Photons of yellow colour are ______ energetic than violet colour

Question # 5

Pauli's principle is applicable to

Question # 6

The charge over mass ratio of electron is:

Question # 7

Their e/m, ratio resembles with that of electrons

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

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

Question # 10

Light emitted from a source has its wave length 500nm, then its wave number will be

Question # 11

The credit of discovering neutron goes to

Question # 12

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

Question # 13

The number of spherical nodes in 3p orbitals are

Question # 14

Rutherford's planetary like picture of the atomic modal was defective because

Question # 15

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

Question # 16

The configuration 1s22s22p53s1shows

Question # 17

In the ground state of an atom the electron is present

Question # 18

Which of the following is not charged particle

Question # 19

The radius of first orbit of H-atom is

Question # 20

Rutherford's model of atom failed because:

Question # 21

Neutron was discovered by:

Question # 22

Orbitals having same energy are called

Question # 23

n + l value for 4f will

Question # 24

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

Question # 25

The electron in an atom

Question # 26

Which of the following is not isoelectronic?

Question # 27

The charge of an electron is determined by

Question # 28

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

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

Spectrum of white light is continuous becuase

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 The radius of first orbit of hydrogen atom
A. 0.329 A°
B. 0.429 A°
C. 0.529 A°
D. 0.229 A°
2 Effective magnetic moment of Sc3+ion is
A. 1.73
B. 0
C. 5.92
D. 2.83
3 When the 6d orbital is completed the entering electron goes into
A. 7f
B. 7 s
C. 7 p
D. 7 d
4 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< ....
5 n + l value for 4f will
A. 2
B. 5
C. 7
D. 9
6 Maximum potential energy that an electron can have within the atom is:
A. Equal to zero.
B. Less than zero.
C. Greater than zero.
D. Infinite
7 1 erg of energy corresponds to
A. 6.02 x 1023J/mol
B. 6.02 x 1016J/mol
C. 1 erg/mol
D. 10-7J/mol
8 Number of neutrons in heavy hydrogen atom is
A. 0
B. 1
C. 2
D. 3
9 Which quantum number is sufficient to describe the electron is hydrogen atom?
A. l
B. n
C. m
D. s
10 Azimuthal quantum number of last electron of 11Na is
A. 1
B. 2
C. 3
D. 0

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