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

When electrons revolve in stationary orbits

Question # 2

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

Question # 3

The orbital in Rutherford's model is

Question # 4

The rules which describe the distribution of electron in atomic energy levels are Auf-ban principle, Pauli's exclusion principle. Hunds rule. The pauli exclusion principle refers to the

Question # 5

The wave number of light emitted by a certain source is 2 x 105m. The wavelength of this light will be:

Question # 6

The valence orbital configuration of an element with atomic number 23 is

Question # 7

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

Question # 8

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

Question # 9

Negatively charged particle nature of cathode rays was first demonstrated in 1895 by:

Question # 10

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 # 11

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

Question # 12

In the ground state, an element has 13 electrons in its M shell. The element is

Question # 13

The value of Plank's constant 'h' is

Question # 14

Which of the following is not a property of cathode rays

Question # 15

The mass of the neutron is of the order of

Question # 16

Charge of an electron is:

Question # 17

The experimental evidences for the existence of atomic nucleus comes from:

Question # 18

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

Question # 19

The order of distance between the various Bohr orbits is

Question # 20

The energy of the first electron is helium will be

Question # 21

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 # 22

The charge over mass ratio of electron is:

Question # 23

The four quantum numbers of the valency electron of potassium are

Question # 24

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

Question # 25

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

Question # 26

The uncertainty principle was stated only

Question # 27

n + l value for 4f will

Question # 28

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

Question # 29

Which of the following has more unpaired d-electrons?

Question # 30

The quantum number which determines the shape of the orbital is

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 Which of the following particles has longest wavelength, if they have same speed:
A. Proton.
B. Neutron.
C. Electron.
D. Positron.
2 When the electron jumps form third, fourth, fifth orbits to the second orbit, the transitions are known as
A. Paschen
B. Pfund
C. Balmer
D. Brackett
3 Which of the following has more unpaired d-electrons?
A. Zn+
B. Fe2+
C. Ni3+
D. Cu+
4 Light emitted from a source has its wave length 500nm, then its wave number will be
A. 2 x 106m-1
B. 2 x 107m-1
C. 5 x 108 m-1
D. 5 x 109m-1
5 The maximum number of electrons in a subshell for which l = 3 is
A. 14
B. 10
C. 8
D. 4
6 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
A. Lyman series
B. Blamer series
C. Paschen series
D. Brackett series
7 Rutherford's model of atom failed because:
A. The atom did o have a nucleus and electrons
B. It did not account fro the attraction b/w protons and neutrons
C. It did no account for the stability of the atom.
D. There is actually no space b/w the nucleus ad the electrons.
8 Charge to mass ratio of electron was discovered by:
A. Millika.
B. Rutherford.
C. J.J. Thomson.
D. Chadwick.
9 The charge of an electron is determined by
A. J.J. Thomson
B. Crooks
C. Perrin
D. R.A.Millikan
10 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

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