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

Question # 2

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

Question # 3

The configuration 1s22s22p53s1shows

Question # 4

The total values of magnetic quantum number of subshell are five, the subshell is

Question # 5

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

Question # 6

The radius of first orbit of hydrogen atom

Question # 7

Bohr model of atom is contradicted by:

Question # 8

The principle quantum number describes

Question # 9

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

Question # 10

Rutherford's atomic model suggests the existence of

Question # 11

The arrangement of subshells in the ascending order of their energy on complete filing of 4f subshell the entering electrons goes to

Question # 12

The nature of positive ray depend on:

Question # 13

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

Question # 14

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

Question # 15

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

Question # 16

Which of the following is not charged particle

Question # 17

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

Question # 18

Neutrons was discovered by

Question # 19

The mass of the neutron is of the order of

Question # 20

Effective magnetic moment of Sc3+ion is

Question # 21

Pauli's principle is applicable to

Question # 22

The orbital in Rutherford's model is

Question # 23

The velocity of photon is:

Question # 24

Consider the ground state of Cr atom (Z=24). The numbers of electrons with the azimuthal quantum numbers l = 1 and l = 2 are respectively

Question # 25

In Millikan method the oil droplet falls under the force of gravity but it moves upward due to

Question # 26

The correct set of quantum numbers (n,l and m) respectively of the unpaired electron of chlorine atom is

Question # 27

The nature of positive rays depend on:

Question # 28

Which of the following orbitals have a dumb bell shape?

Question # 29

The e.m value for positive rays maximum for:

Question # 30

Charge to mass ratio of electron was discovered by:

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 The value of charge on electron is
A. 1.602 x 10-19coulombs
B. 1.602 x 10-18coulombs
C. 1.602 x 10-17coulombs
D. 1.602 x 10-16 coulombs
2 Which one of the following particles has amass 1/1836 time, that of hydrogen?
A. Neutron.
B. Proton.
C. Electron.
D. Positron.
3 The energy of the first electron is helium will be
A. -13.6 eV
B. -54.4 eV
C. -5.44 eV
D. zero
4
Question Image
A. Plank's equations
B. de Broglie's equations
C. Heisenburg's equation
D. None
5 The total number of orbitals in a shell with principal quantum number 'n' is
A. 2n
B. 2n2
C. n2
D. n + 1
6 Which one of the following statements is true about discovery of neutrons?
A. These particles were formed by the bombardment of Alpha-particles on Beryllium.
B. These particles are formed by the spiting of alpha-particles.
C. These particles were discovered by natural radioactivity.
D. None of above.
7 When the electron jumps form third, fourth, fifth orbits to the second orbit, the transitions are known as
A. Paschen
B. Pfund
C. Balmer
D. Brackett
8 Balmer's series is in ______ region
A. Visible
B. U V
C. I. R.
D. None
9 The velocity of photon is:
A. Independent of its wavelength.
B. Depends on its wavelength.
C. Equal to square of its amplitude
D. Depends on its source.
10 The charge of an electron is determined by
A. J.J. Thomson
B. Crooks
C. Perrin
D. R.A.Millikan

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