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

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

Question # 2

Rutherford's atomic model suggests the existence of

Question # 3

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

Question # 4

When the electron jumps form third, fourth, fifth orbits to the second orbit, the transitions are known as

Question # 5

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

Question # 6

Alpha rays consist of:

Question # 7

The charge over mass ratio of electron is:

Question # 8

The quantum number which describe the orientation of the orbitals is

Question # 9

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

Question # 10

The velocity of photon is:

Question # 11

The radius of first orbit of H-atom is

Question # 12

Anode is the surface on which probability of finding electron is:

Question # 13

The wave length of electron as wave is 0.5 nm. What is the wave length in meter

Question # 14

The electron in an atom

Question # 15

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

Question # 16

The mass of the neutron is of the order of

Question # 17

Rutherford's model of atom failed because:

Question # 18

Neutron was discovered by:

Question # 19

If the value of principal quantum number is 3. the total possible values for magnetic quantum number will be

Question # 20

The energy of the first electron is helium will be

Question # 21

The electronic configuration of an atom/ion can be defined by the following

Question # 22

The nature of the positive rays depend on

Question # 23

Their e/m, ratio resembles with that of electrons

Question # 24

The number of neutrons in the element 94Be is

Question # 25

The orbital in Rutherford's model is

Question # 26

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

Question # 27

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

Question # 28

Schrodinger wave equation describes electron completely because

Question # 29

The quantum number which determines the shape of the orbital is

Question # 30

The four quantum numbers of the valency electron of potassium are

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 In the atomic emission spectrum the lines which appear bright, appear dark in absorption spectrum because
A. The radiations emitted in emission spectrum are absorbed in absorption spectrum
B. Atomic emission spectrum is continuous
C. Atomic absorption spectrum is continuous
D. Distance between the lines increases
2 Cathode rays drive a small paddle wheel placed in their path. This observation shows that
A. Cathode rays travel in straight lines
B. Cathode rays are negatively charged
C. Cathode rays produce x-rays
D. Cathode rays are material particles having momentum
3 The spectrum of helium is expected to be similar to that of
A. H
B. Li+
C. Na
D. He+
4 With increasing principle quantum number, the energy difference between adjacent energy levels in H atom
A. Decreases
B. Increases
C. Remains constant
D. Decreases for low value of Z and increase for higher value of Z
5 The third line of the Balmer series, in the emission spectrum of the hydrogen atom,is due to the transition from the
A. Fourth Bohr orbit to the first Bohr orbit
B. Fifth Bohr orbit to the second Bohr orbit
C. Sixth Bohr orbit to the third Bohr orbit
D. Seventh Bohr orbit to the third Bohr orbit
6 1 erg of energy corresponds to
A. 6.02 x 1023J/mol
B. 6.02 x 1016J/mol
C. 1 erg/mol
D. 10-7J/mol
7 Their e/m, ratio resembles with that of electrons
A. Alpha rays
B. Beta rays
C. Gamma rays
D. X-rays
8 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.
9 Which of the following is not a sub-atomic particle
A. Electron
B. Proton
C. Neutron
D. Deuteron
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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