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

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

Question # 2

The radiations with wavelength shorter than violet light are called

Question # 3

When the electron jumps form third, fourth, fifth orbits to the second orbit, the transitions are known as

Question # 4

Which of the following orbitals have a dumb bell shape?

Question # 5

The nature of positive ray depend on:

Question # 6

Neutron was discovered by:

Question # 7

The velocity of photon is:

Question # 8

Which of the following is not a property of cathode rays

Question # 9

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

Question # 10

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

Question # 11

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

Question # 12

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

Question # 13

The radius of first orbit of H-atom is

Question # 14

The value of Plank's constant 'h' is

Question # 15

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

Question # 16

An electron has principal quantum number 3. The number of its 1 subshell and 2 orbitals would be respectively

Question # 17

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

Question # 18

Which of the following is not charged particle

Question # 19

The rules which describe the distribution of electron in atomic energy levels are Auf-ban principle, Pauli's exclusion principle. Hunds rule. The pauli exclusion principle refers to the

Question # 20

The order of frequency of the following radiations unltraviolet, visible, infrared and microwave is

Question # 21

The number of neutrons in the element 94Be is

Question # 22

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

Question # 23

Splitting of spectral lines when atoms are subjected to strong electron field is called

Question # 24

The size of electronic shell is described by

Question # 25

n + l value for 4f will

Question # 26

When the 6d orbital is completed the entering electron goes into

Question # 27

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

Question # 28

The credit of discovering neutron goes to

Question # 29

When 6s orbital is complete then next electron goes to

Question # 30

The valence orbital configuration of an element with atomic number 23 is

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 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
2 The electronic configuration of an atom/ion can be defined by the following
A. Aufbau principle
B. Pauli's exclusion principle
C. Hund's Rule
D. All the above
3
Question Image
A. Plank's equations
B. de Broglie's equations
C. Heisenburg's equation
D. None
4 Rutherford's model of atom failed because:
A. The atom did o have a nucleus and electrons
B. It did not account fro the attraction b/w protons and neutrons
C. It did no account for the stability of the atom.
D. There is actually no space b/w the nucleus ad the electrons.
5 Maximum potential energy that an electron can have within the atom is:
A. Equal to zero.
B. Less than zero.
C. Greater than zero.
D. Infinite
6 When cathode rays strike the anode metal X-rays are emitted and not the positive rays because
A. Cathode rays are material particles
B. Cathode rays knock out electrons from anode, which emit X-rays when outer electron take their place
C. Cathode rays are absorbed by the nucleus
D. Cathode rays become heated
7 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
8 When potassium metal is exposed to violet light
A. Ejection of electrons takes place
B. Ejection of some potassium atoms occurs
C. There is no effect
D. The absorption of electrons takes place
9 The size of electronic shell is described by
A. Azimuthal Q. no
B. Magnetic Q.No
C. Spin Q. No
D. Principle Q. No
10 When electron jumps from n2= 2,3,4,5,.... orbit to n1= 1 orbit in the hydrogen atom, the radiations emitted give the spectral lines
A. Lyman series
B. Blamer series
C. Paschen series
D. Brackett series

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