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

Which one of the following particles has amass 1/1836 time, that of hydrogen?

Question # 2

Charge on electron was discovered by:

Question # 3

Orbital having same energy is called:

Question # 4

Neutrons was discovered by

Question # 5

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

Question # 6

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

Question # 7

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

Question # 8

The range of visible spectrum is

Question # 9

The number of electrons in the M shell of the element with atomic number 24 is

Question # 10

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

Question # 11

Spectrum of white light is continuous becuase

Question # 12

In Bohr model of hydrogen atom the distance between adjacent orbits increases away from the nucleus, the energy difference between the orbits

Question # 13

The velocity of photon is:

Question # 14

Schrodinger wave equation describes electron completely because

Question # 15

Balmer's series is in ______ region

Question # 16

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

Question # 17

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

Question # 18

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 # 19

The charge over mass ratio of electron is:

Question # 20

Orbitals having same energy are called

Question # 21

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

Question # 22

When an electric current is passed through discharge tube at low pressure, cathode rays are emitted from cathode these rays consist of:

Question # 23

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

Question # 24

What is the packet of energy called?

Question # 25

Rutherford's atomic model suggests the existence of

Question # 26

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

Question # 27

Effective magnetic moment of Sc3+ion is

Question # 28

The value of Plank's constant 'h' is

Question # 29

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

Question # 30

The number of spherical nodes in 3p orbitals are

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 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
A. 12 and 4
B. 16 and 5
C. 16 and 4
D. 12 and 5
2 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
3 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
4 Which one of the following particles has amass 1/1836 time, that of hydrogen?
A. Neutron.
B. Proton.
C. Electron.
D. Positron.
5 Quantum number value for 2p orbitals are:
A. n=2 ,l=1
B. n=1 ,l=2
C. n= ,l=0
D. n=2 ,l=0
6 The correct set of quantum numbers (n,l and m) respectively of the unpaired electron of chlorine atom is
A. 2,1,0
B. 2,1,1
C. 3,1,1
D. 3,2,1
7 The spectrum of helium is expected to be similar to that of
A. H
B. Li+
C. Na
D. He+
8 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.
9 The divisibility of atom was shown by
A. Stoney
B. J.J. Thomson
C. Millikan
D. Rutherford
10 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

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