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

Rutherford's atomic model suggests the existence of

Question # 2

When electrons revolve in stationary orbits

Question # 3

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

Question # 4

The divisibility of atom was shown by

Question # 5

The value of R (Rydberg's constant) is _______ m-1

Question # 6

Heaviest particle is

Question # 7

Which is not true with respect to cathode rays?

Question # 8

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

Question # 9

The spectrum of helium is expected to be similar to that of

Question # 10

The value of charge on electron is

Question # 11

Which of the following is not charged particle

Question # 12

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

Question # 13

When electron jumps from n2= 2,3,4,5,.... orbit to n1= 1 orbit in the hydrogen atom, the radiations emitted give the spectral lines

Question # 14

1 erg of energy corresponds to

Question # 15

Balmer's series is in ______ region

Question # 16

Charge on electron was discovered by:

Question # 17

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

Question # 18

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

Question # 19

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

Question # 20

The mass of the neutron is of the order of

Question # 21

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

Question # 22

Energy of electron in the infinite Bohr orbit of H-atom is

Question # 23

Azimuthal quantum number of last electron of 11Na is

Question # 24

The radius of first orbit of H-atom is

Question # 25

Their e/m, ratio resembles with that of electrons

Question # 26

Splitting of spectral lines of the hydrogen atom under the influence or magnetic field is called

Question # 27

Cathode rays emitted from cathode are

Question # 28

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

Question # 29

The radius of second Bohr's orbit is

Question # 30

Rutherford's model of atom failed because:

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 The correct set of quantum numbers (n,l and m) respectively of the unpaired electron of chlorine atom is
A. 2,1,0
B. 2,1,1
C. 3,1,1
D. 3,2,1
2 Rutherford's experiment led to the discovery of
A. Nucleus
B. Electron
C. Proton
D. alpha particle
3 The range of visible spectrum is
A. 300 - 600 nm
B. 600 - 900 nm
C. 400 - 750 nm
D. 100 - 300 nm
4 The energy of the first electron is helium will be
A. -13.6 eV
B. -54.4 eV
C. -5.44 eV
D. zero
5 When an electric current is passed through discharge tube at low pressure, cathode rays are emitted from cathode these rays consist of:
A. Alpha rays.
B. Negative particles.
C. Electromagnetic rays.
D. Positive particles.
6 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
7 Schrodinger wave equation describes electron completely because
A. It describes a set of four quantum number
B. It describes the particle nature of electron
C. It measures wavelength of electron
D. It describes electron moving in specific orbit
8 Which quantum number is sufficient to describe the electron is hydrogen atom?
A. l
B. n
C. m
D. s
9 Orbital having same energy is called:
A. Hybrid orbital.
B. Valence orbital.
C. Degenerate orbital.
D. D-orbital.
10 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

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