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

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

Question # 2

Negatively charged particle nature of cathode rays was first demonstrated in 1895 by:

Question # 3

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

Question # 4

Charge to mass ratio of electron was discovered by:

Question # 5

The energy of ionization of an atom is the energy difference between orbital

Question # 6

The energy of the first electron is helium will be

Question # 7

Alpha rays consist of:

Question # 8

Energy of electron in the infinite Bohr orbit of H-atom is

Question # 9

Heaviest particle is

Question # 10

Rutherford's atomic model suggests the existence of

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

The nature of positive ray depend on:

Question # 15

The total number of orbitals possible for the quantum number n is

Question # 16

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

Question # 17

Proton was discovered by:

Question # 18

The de-Brogile wavelength of a particle with mass 1g and velocity 100 m/s is

Question # 19

The value of Plank's constant 'h' is

Question # 20

The spectrum of helium is expected to be similar to that of

Question # 21

A 4f orbital has

Question # 22

The spectrum of He is expected to be similar to that of

Question # 23

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

Question # 24

Cathode rays emitted from cathode are

Question # 25

Neutron was discovered by:

Question # 26

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

Question # 27

When potassium metal is exposed to violet light

Question # 28

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

Question # 29

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

Question # 30

Rutherford's experiment led to the discovery of

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 Which of the following particles has longest wavelength, if they have same speed:
A. Proton.
B. Neutron.
C. Electron.
D. Positron.
2 When 3p orbital is complete, the entering electron goes into
A. 4s
B. 3d
C. 4p
D. 4f
3 The order of distance between the various Bohr orbits is
A. r2- r1> r3- r2> r4- r3> ......
B. r1> r2> r2- r3> r4-r3> .....
C. r2-r1= r3- r2= r4- r3> .....
D. r2- r1> r3- r2< r4- r3< ....
4 Their e/m, ratio resembles with that of electrons
A. Alpha rays
B. Beta rays
C. Gamma rays
D. X-rays
5 The experimental evidences for the existence of atomic nucleus comes from:
A. Line spectrum of hydrogen.
B. Magnetic bonding of cathode rays.
C. Millikan oil drop experiment.
D. Scattering of alpha particles by thin metal foil.
6 Which one of the following particles has amass 1/1836 time, that of hydrogen?
A. Neutron.
B. Proton.
C. Electron.
D. Positron.
7 Pauli's principle is applicable to
A. Degenerate orbits
B. Two electrons in the same orbital
C. One electron
D. None
8 Which of the following has more unpaired d-electrons?
A. Zn+
B. Fe2+
C. Ni3+
D. Cu+
9 Proton was discovered by:
A. Chadwick
B. J.J. Rhomson
C. Millikan.
D. Goldstein.
10 Four d-orbitals contain four lobes while fifth contains only two lobes the orbital is
A. dxy
B. dxz
C. dz2
D. dx2- y2

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