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

Neutrons was discovered by

Question # 2

The total number of possible values of magnetic quantum number for the value of l=3 is

Question # 3

The number of de-electrons retained in Fe2+ (At.No. of Fe = 26) ions is

Question # 4

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

Question # 5

Which of the following was discovered first:

Question # 6

Which of the following is not charged particle

Question # 7

The radiations with wavelength shorter than violet light are called

Question # 8

Orbitals having same energy are called

Question # 9

The number of spherical nodes in 3p orbitals are

Question # 10

The quantum number which describes the shape of the orbital is

Question # 11

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

Question # 12

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

Question # 13

Sodium chloride imparts a yellow colour to the Bunsen flame. This can be interpreted due to the

Question # 14

Number of neutrons in heavy hydrogen atom is

Question # 15

In the atomic emission spectrum the lines which appear bright, appear dark in absorption spectrum because

Question # 16

Which of the following orbitals have a dumb bell shape?

Question # 17

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

Question # 18

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

Question # 19

The nature of the positive rays depend on

Question # 20

The maximum number of electrons in a subshell for which l = 3 is

Question # 21

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

Question # 22

The degenerate orbitals p-sub shell are

Question # 23

When 3p orbital is complete, the entering electron goes into

Question # 24

The charge of an electron is determined by

Question # 25

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

Question # 26

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

Question # 27

Cathode rays drive a small paddle wheel placed in their path. This observation shows that

Question # 28

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

Question # 29

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

Question # 30

The order of frequency of the following radiations unltraviolet, visible, infrared and microwave is

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 Positive particle in discharged tube is produced by ionization of gas molecules, which is caused by
A. Gas molecules collide with anode
B. Gas molecules are at high temperature
C. Gas molecules produce X-rays
D. Cathode rays remove electrons from gas molecules
2 The radius of first orbit of H-atom is
A. 4.75 A°
B. 3.84 A°
C. 8.4 A°
D. 0.529 A°
3 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
4 The number of neutrons in the element 94Be is
A. 4
B. 5
C. 9
D. 13
5 When 6d orbital is complete, the entering electron goes into:
A. 7f.
B. 7s.
C. 7p.
D. 7d.
6 The charge of an electron is determined by
A. J.J. Thomson
B. Crooks
C. Perrin
D. R.A.Millikan
7 Rutherford's atomic model suggests the existence of
A. Atom
B. Nucleus
C. alpha particle
D. Measons
8 Four d-orbitals contain four lobes while fifth contains only two lobes the orbital is
A. dxy
B. dxz
C. dz2
D. dx2- y2
9 The total values of magnetic quantum number of subshell are five, the subshell is
A. S-subshell
B. P-subshell
C. D-subshell
D. F-subshell
10 When 6s orbital is complete then next electron goes to
A. 6p
B. 6d
C. 5d
D. 4f

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