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

Charge to mass ratio (e/m) of the electron is determined by

Question # 2

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

Question # 3

Their e/m, ratio resembles with that of electrons

Question # 4

The total number of orbitals in a shell with principal quantum number 'n' is

Question # 5

E = hv is the

Question # 6

The value of charge on electron is

Question # 7

Orbitals having same energy are called

Question # 8

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

Question # 9

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

Question # 10

Energy of electron in first orbit of H atom is

Question # 11

The velocity of photon is:

Question # 12

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

Question # 13

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

Question # 14

Photons of yellow colour are ______ energetic than violet colour

Question # 15

The arrangement of subshells in the ascending order of their energy on complete filing of 4f subshell the entering electrons goes to

Question # 16

Smallest charge of electricity that has been measured so far is

Question # 17

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

Question # 18

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

Question # 19

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?

Question # 20

The e.m value for positive rays maximum for:

Question # 21

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

Question # 22

The radius of first orbit of H-atom is

Question # 23

Effective magnetic moment of Sc3+ion is

Question # 24

Spectrum of white light is continuous becuase

Question # 25

Bohr model of atom is contradicted by:

Question # 26

The configuration 1s22s22p53s1shows

Question # 27

The quantum number which describes the shape of the orbital is

Question # 28

Which of the following element's outermost orbits last electron has magnetic quantum number m=0?

Question # 29

The principle quantum number describes

Question # 30

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

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 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
2 Rutherford's experiment led to the discovery of
A. Nucleus
B. Electron
C. Proton
D. alpha particle
3 Which of the following is not charged particle
A. Proton
B. Electron
C. Neutron
D. Hydrogen nucleus
4 The radiations with wavelength shorter than violet light are called
A. Ultraviolet
B. Infrared
C. Microwave
D. Radio frequency
5 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
6 The number of electrons in the M shell of the element with atomic number 24 is
A. 24
B. 12
C. 13
D. 8
7 Cathode rays drive a small paddle wheel placed in their path. This observation shows that
A. Cathode rays travel in straight lines
B. Cathode rays are negatively charged
C. Cathode rays produce x-rays
D. Cathode rays are material particles having momentum
8 The third line of the Balmer series, in the emission spectrum of the hydrogen atom,is due to the transition from the
A. Fourth Bohr orbit to the first Bohr orbit
B. Fifth Bohr orbit to the second Bohr orbit
C. Sixth Bohr orbit to the third Bohr orbit
D. Seventh Bohr orbit to the third Bohr orbit
9 The divisibility of atom was shown by
A. Stoney
B. J.J. Thomson
C. Millikan
D. Rutherford
10 The maximum number of electrons in a subshell for which l = 3 is
A. 14
B. 10
C. 8
D. 4

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