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

00:00
Question # 1

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

Question # 2

Which of the following is not isoelectronic?

Question # 3

Balmer's series is in ______ region

Question # 4

Their e/m, ratio resembles with that of electrons

Question # 5

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

Question # 6

The energy of ionization of an atom is the energy difference between orbital

Question # 7

The divisibility of atom was shown by

Question # 8

Charge on electron was discovered by:

Question # 9

Energy of electron in an orbit according to Bohr theory is negative due to

Question # 10

The ratio of the ionization energy of H and Be3+is

Question # 11

The nature of positive ray depend on:

Question # 12

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

Question # 13

The radius of first orbit of H-atom is

Question # 14

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

Question # 15

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

Question # 16

Which of the following has more unpaired d-electrons?

Question # 17

Heaviest particle is

Question # 18

The quantum number which describes the shape of the orbital is

Question # 19

Cathode rays emitted from cathode are

Question # 20

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

Question # 21

Orbitals having same energy are called

Question # 22

Energy of electron in first orbit of H atom is

Question # 23

In the ground state of an atom the electron is present

Question # 24

The e.m value for positive rays maximum for:

Question # 25

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 # 26

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

Question # 27

The quantum number which describe the orientation of the orbitals is

Question # 28

The mass of the neutron is of the order of

Question # 29

When electrons revolve in stationary orbits

Question # 30

Spectrum of white light is continuous becuase

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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 A 4f orbital has
A. one node
B. two node
C. three node
D. four nodes
3 When 6d orbital is complete, the entering electron goes into:
A. 7f.
B. 7s.
C. 7p.
D. 7d.
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 The wave number of the line emitted is 109.678 x 105m-1in the Lyman series when electron transition occurs
6 The energy of ionization of an atom is the energy difference between orbital
7 The quantum number which determines the shape of the orbital is
A. principal
B. azimuthal
C. magnetic
D. spin
8 In which of the following pairs, the numbers of electrons in the outermost shell are different?
A. As,Sb
B. Ge,Sn
C. In,pt
D. Se,Te
9 In Millikan method for determination of charge on electron the air in the chamber is ionized by
A. Protons
B. Electric field
C. X-rays
D. a - particles
10 Rutherford's atomic model suggests the existence of
A. Atom
B. Nucleus
C. alpha particle
D. Measons

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