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

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

Question # 2

Cathode rays emitted from cathode are

Question # 3

The mass of the neutron is of the order of

Question # 4

The divisibility of atom was shown by

Question # 5

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

Question # 6

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

Question # 7

Four d-orbitals contain four lobes while fifth contains only two lobes the orbital is

Question # 8

Rutherford's experiment led to the discovery of

Question # 9

Quantum number values for 2p orbitals are

Question # 10

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

Question # 11

The orbital in Rutherford's model is

Question # 12

Heaviest particle is

Question # 13

Which of the following has more unpaired d-electrons?

Question # 14

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

Question # 15

Rutherford's model of atom failed because:

Question # 16

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

Question # 17

The atomic number of an element is 35 what is the total number of electrons present in all the p-orbitals of the ground state atom of that element?

Question # 18

n + l value for 4f will

Question # 19

The charge of an electron is determined by

Question # 20

The nature of positive rays depend on:

Question # 21

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

Question # 22

The value of charge on electron is

Question # 23

Which quantum number is sufficient to describe the electron is hydrogen atom?

Question # 24

When 6s orbital is complete then next electron goes to

Question # 25

The limiting line of Blamer series in hydrogen spectrum lies in

Question # 26

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

Question # 27

The radius of first orbit of H-atom is

Question # 28

The radius of first orbit of hydrogen atom

Question # 29

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

Question # 30

An orbital can accommodate maximum two electrons with opposite spins according to

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 The range of visible spectrum is
A. 300 - 600 nm
B. 600 - 900 nm
C. 400 - 750 nm
D. 100 - 300 nm
2 Light emitted from a source has its wave length 500nm, then its wave number will be
A. 2 x 106m-1
B. 2 x 107m-1
C. 5 x 108 m-1
D. 5 x 109m-1
3 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
4 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
5 The principle quantum number describes
A. The distance form the nucleus
B. The shape of the orbital
C. The orientation of the orbital
D. The spin of the electron
6 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
7 Which of the following is not charged particle
A. Proton
B. Electron
C. Neutron
D. Hydrogen nucleus
8 The wave number of the line emitted is 109.678 x 105m-1in the Lyman series when electron transition occurs
9 Negatively charged particle nature of cathode rays was first demonstrated in 1895 by:
A. Millikan.
B. J. Perrin.
C. Hittrof
D. J.J. Thomson.
10 Schrodinger wave equation describes electron completely because
A. It describes a set of four quantum number
B. It describes the particle nature of electron
C. It measures wavelength of electron
D. It describes electron moving in specific orbit

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