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

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

Question # 2

The charge over mass ratio of electron is:

Question # 3

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

Question # 4

Photons of yellow colour are ______ energetic than violet colour

Question # 5

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

Question # 6

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

Question # 7

The nature of positive rays depend on:

Question # 8

Which of the following is not a property of cathode rays

Question # 9

In the ground state of an atom the electron is present

Question # 10

Schrodinger wave equation describes electron completely because

Question # 11

What is the packet of energy called?

Question # 12

Mass of simple electron is:

Question # 13

The nature of positive ray depend on:

Question # 14

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

Question # 15

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

Question # 16

Electrons arranged in orbitals according to the increasing order of their n + l values, this rule is named as

Question # 17

The orbital in Rutherford's model is

Question # 18

Which is not true with respect to cathode rays?

Question # 19

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

Question # 20

If the value of azimuthal quantum number is 3, then values of m the magnetic quantum no. will be

Question # 21

The order of distance between the various Bohr orbits is

Question # 22

The credit of discovering neutron goes to

Question # 23

Subsidiary quantum number specifies

Question # 24

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

Question # 25

The total number of orbitals in a shell with principal quantum number 'n' is

Question # 26

Charge on electron was discovered by:

Question # 27

Number of neutrons in heavy hydrogen atom is

Question # 28

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

Question # 29

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

Question # 30

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

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 Photons of yellow colour are ______ energetic than violet colour
A. More
B. Less
C. Equal
D. None
2 The total number of possible values of magnetic quantum number for the value of l=3 is
A. 3
B. 1
C. 5
D. 7
3 The number of electrons in the M shell of the element with atomic number 24 is
A. 24
B. 12
C. 13
D. 8
4 The value of R (Rydberg's constant) is _______ m-1
A. 1.0974 x 107
B. 1.0842 x 107
C. 1.082 x 10-7
D. Both a and b
5 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
6 When 3p orbital is complete, the entering electron goes into
A. 4s
B. 3d
C. 4p
D. 4f
7 The wave number of the line emitted is 109.678 x 105m-1in the Lyman series when electron transition occurs
8 The limiting line of Blamer series in hydrogen spectrum lies in
A. Visible regions
B. Ultraviolet region
C. Infrared region
D. x-rays region
9 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
A. Voltage is low
B. Discharge tube is not coloured
C. Gas does not conduct current under ordinary pressure
D. Temperature low
10 The nature of the positive rays depend on
A. The nature of the electrode
B. The nature of the discharge tube
C. The nature of the residual gas
D. All of the above

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