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

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

Question # 2

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

Question # 3

Which of the following orbitals have a dumb bell shape?

Question # 4

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

Question # 5

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

Question # 6

The divisibility of atom was shown by

Question # 7

In which of the following pairs, the numbers of electrons in the outermost shell are different?

Question # 8

Charge on electron was discovered by:

Question # 9

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

Question # 10

Neutron was discovered by:

Question # 11

The electron in an atom

Question # 12

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

Question # 13

The uncertainty principle was stated only

Question # 14

Their e/m, ratio resembles with that of electrons

Question # 15

When electrons revolve in stationary orbits

Question # 16

The quantum number which determines the shape of the orbital is

Question # 17

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

Question # 18

Electrons in degenerate orbitals are placed in separate orbitals with same spin according to

Question # 19

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

Question # 20

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

Question # 21

Proton was discovered by:

Question # 22

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

Question # 23

For principle quantum number n=4, the total number of orbitals having l = 3 is

Question # 24

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

Question # 25

n + l value for 4f will

Question # 26

Which of the following particles has longest wavelength, if they have same speed:

Question # 27

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

Question # 28

The order of distance between the various Bohr orbits is

Question # 29

Effective magnetic moment of Sc3+ion is

Question # 30

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

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 Four d-orbitals contain four lobes while fifth contains only two lobes the orbital is
A. dxy
B. dxz
C. dz2
D. dx2- y2
2 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.
3 e/m of cathode rays is same but for positive rays e/m changes by changing gas in the discharge tube because
A. Cathode rays are small sized particles
B. Cathode rays have same charge
C. Nature of cathode rays same for all gasses, but masses of nuclei are different for different gases
D. Temperature of cathode rays higher
4 For principle quantum number n=4, the total number of orbitals having l = 3 is
A. 3
B. 7
C. 5
D. 9
5 Alpha rays consist of:
A. Neutrons.
B. Helium nucleus.
C. Protons.
D. Hydrogen nucleus.
6 Balmer's series is in ______ region
A. Visible
B. U V
C. I. R.
D. None
7 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°
8 Charge to mass ratio of electron was discovered by:
A. Millika.
B. Rutherford.
C. J.J. Thomson.
D. Chadwick.
9 Electrons in degenerate orbitals are placed in separate orbitals with same spin according to
A. Hund's rule
B. Pauli exclusion principle
C. Aufbau principle
D. Mosley's law
10 Which of the following is not charged particle
A. Proton
B. Electron
C. Neutron
D. Hydrogen nucleus

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