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 velocity of photon is:

Question # 2

With the reference of w/m ratio of anode rays, the e/m ratio of cathode rays s:

Question # 3

Cathode rays emitted from cathode are

Question # 4

A 4f orbital has

Question # 5

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

Question # 6

The four quantum numbers of the valency electron of potassium are

Question # 7

Orbital having same energy is called:

Question # 8

n + l value for 4f will

Question # 9

Proton was discovered by:

Question # 10

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

Question # 11

Azimuthal quantum number of last electron of 11Na is

Question # 12

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

Question # 13

Mass of simple electron is:

Question # 14

The size of electronic shell is described by

Question # 15

The energy of the first electron is helium will be

Question # 16

Find the magnetic moment of a divalent ion in aqueous solution if its atomic number is 25

Question # 17

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

Question # 18

The quantum number which determines the shape of the orbital is

Question # 19

The limiting line of Blamer series in hydrogen spectrum lies in

Question # 20

Which of the following is not isoelectronic?

Question # 21

Pauli's principle is applicable to

Question # 22

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

Question # 23

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

Question # 24

Spectrum of white light is continuous becuase

Question # 25

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

Question # 26

The radius of second Bohr's orbit is

Question # 27

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

Question # 28

Which is not true with respect to cathode rays?

Question # 29

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

Question # 30

Balmer's series is in ______ region

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 Effective magnetic moment of Sc3+ion is
A. 1.73
B. 0
C. 5.92
D. 2.83
2 With the reference of w/m ratio of anode rays, the e/m ratio of cathode rays s:
A. Greater.
B. same.
C. Smaller.
D. Not fixed.
3 When the electron jumps form second third, fourth orbit to the fist orbit, the transitions are known as
A. Balmer series
B. Lyman series
C. Pfund series
D. Brackett series
4 Number of neutrons in heavy hydrogen atom is
A. 0
B. 1
C. 2
D. 3
5 The wave number of light emitted by a certain source is 2 x 105m. The wavelength of this light will be:
A. 500 NM.
B. 500 M.
C. 200 NM.
D. 5 x 107m
6 The charge of an electron is determined by
A. J.J. Thomson
B. Crooks
C. Perrin
D. R.A.Millikan
7 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
8 Splitting of spectral lines when atoms are subjected to strong electron field is called
A. Zeeman effect
B. Stark effect
C. Photoelectric effect
D. Compton effect
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 Rutherford's planetary like picture of the atomic modal was defective because
A. It did not describe the quantity of positive charge
B. It did not explain the repulsion of protons within the nucleus
C. No empty space between nucleus and the electrons
D. Moving electron should radiate energy

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