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 potassium metal is exposed to violet light

Question # 2

Heaviest particle is

Question # 3

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

Question # 4

The orbitals having n + l = 5 are

Question # 5

Charge to mass ratio of electron was discovered by:

Question # 6

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

Question # 7

When cathode rays strike the anode metal X-rays are emitted and not the positive rays because

Question # 8

If the radius of first Bohr orbit be ao, then the radius of third Bohr orbit would be

Question # 9

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

Question # 10

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

Question # 11

Which of the following is not isoelectronic?

Question # 12

An electron has principal quantum number 3. The number of its 1 subshell and 2 orbitals would be respectively

Question # 13

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 # 14

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

Question # 15

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

Question # 16

Energy of electron in first orbit of H atom is

Question # 17

Which of the following is not a sub-atomic particle

Question # 18

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

Question # 19

Alpha rays consist of:

Question # 20

Neutron was discovered by:

Question # 21

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

Question # 22

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

Question # 23

Spectrum of white light is continuous becuase

Question # 24

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

Question # 25

Rutherford's experiment led to the discovery of

Question # 26

No cathode rays are produced in the discharged tube when gas is under ordinary pressure even if voltage of 5000 to 10000 is applies. This reason is

Question # 27

Which have better penetrating power

Question # 28

Effective magnetic moment of Sc3+ion is

Question # 29

Balmer's series is in ______ region

Question # 30

Azimuthal quantum number of last electron of 11Na is

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 Splitting of spectral lines when atoms are subjected to strong electric field is called:
A. Zeeman effect.
B. Stark effect
C. Photoelectric effect.
D. Compton effect.
2 Pauli's principle is applicable to
A. Degenerate orbits
B. Two electrons in the same orbital
C. One electron
D. None
3 An orbital can accommodate maximum two electrons with opposite spins according to
A. Heisenberg's principle
B. Aufbau principle
C. Hund's srule
D. Pauli exclusion principle
4 The quantum number which describe the orientation of the orbitals is
A. Spin quantum number
B. Principle quantum number
C. Azimathal quantum number
D. Magnetic quantum number
5 Number of neutrons in heavy hydrogen atom is
A. 0
B. 1
C. 2
D. 3
6 The charge of an electron is determined by
A. J.J. Thomson
B. Crooks
C. Perrin
D. R.A.Millikan
7 Which one of the following particles has amass 1/1836 time, that of hydrogen?
A. Neutron.
B. Proton.
C. Electron.
D. Positron.
8 The principle quantum number describes
A. The distance form the nucleus
B. The shape of the orbital
C. The orientation of the orbital
D. The spin of the electron
9 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
10 Orbital having same energy is called:
A. Hybrid orbital.
B. Valence orbital.
C. Degenerate orbital.
D. D-orbital.

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