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 experiment led to the discovery of

Question # 2

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

Question # 3

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

Question # 4

Charge of an electron is:

Question # 5

n + l value for 4f will

Question # 6

Azimuthal quantum number of last electron of 11Na is

Question # 7

The symbol of the element whose atoms have the outer most electronic configuration 2s22p3is

Question # 8

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

Question # 9

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

Question # 10

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

Question # 11

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

Question # 12

When the 6d orbital is completed the entering electron goes into

Question # 13

The de-Brogile wavelength of a particle with mass 1g and velocity 100 m/s is

Question # 14

In Bohr model of hydrogen atom the distance between adjacent orbits increases away from the nucleus, the energy difference between the orbits

Question # 15

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

Question # 16

Rutherford's planetary like picture of the atomic modal was defective because

Question # 17

The credit of discovering neutron goes to

Question # 18

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

Question # 19

Neutron was discovered by:

Question # 20

The divisibility of atom was shown by

Question # 21

Which of the following is not a property of cathode rays

Question # 22

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

Question # 23

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

Question # 24

The nature of the positive rays depend on

Question # 25

1 erg of energy corresponds to

Question # 26

Which of the following orbitals have a dumb bell shape?

Question # 27

The orbital in Rutherford's model is

Question # 28

Maximum potential energy that an electron can have within the atom is:

Question # 29

The mass of the neutron is of the order of

Question # 30

The radius of first orbit of H-atom is

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 Which one of the following statements is true about discovery of neutrons?
A. These particles were formed by the bombardment of Alpha-particles on Beryllium.
B. These particles are formed by the spiting of alpha-particles.
C. These particles were discovered by natural radioactivity.
D. None of above.
2 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
3 For which of the following sets of quantum numbers and electron will have the highest energy?
A. 3,2,1,1/2
B. 4,2,-1,1/2
C. 4,1,0,-1/2
D. 5,0,0,1/2
4 Which of the following is not a sub-atomic particle
A. Electron
B. Proton
C. Neutron
D. Deuteron
5 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
6 Proton was discovered by:
A. Chadwick
B. J.J. Rhomson
C. Millikan.
D. Goldstein.
7 Which of the following element's outermost orbits last electron has magnetic quantum number m=0?
A. Na
B. O
C. Cl
D. N
8 Sodium chloride imparts a yellow colour to the Bunsen flame. This can be interpreted due to the
A. low ionization energy of sodium
B. sublimation of metallic sodium to give yellow vapour
C. emission of excess energy absorbed as a radiation in the visible region as a radiation in the visible region
D. photosenitivity
9 Which of the following was discovered first:
A. Charge to mass ratio of electrons.
B. Mass of electrons.
C. Charge of electrons.
D. All of above at same time.
10 The spectrum of helium is expected to be similar to that of
A. H
B. Li+
C. Na
D. He+

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