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

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

Question # 2

When cathode rays strike the anode metal X-rays are emitted and not the positive rays because

Question # 3

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

Question # 4

With the reference of w/m ratio of anode rays, the e/m ratio of cathode rays s:

Question # 5

The symbol of the element whose atoms have the outer most electronic configuration 2s22p3is

Question # 6

The maximum number of electrons in a subshell for which l = 3 is

Question # 7

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 # 8

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

Question # 9

In the ground state of an atom, the electron is present:

Question # 10

The wave number of light emitted by a certain source is 2 x 105m. The wavelength of this light will be:

Question # 11

The third line of the Balmer series, in the emission spectrum of the hydrogen atom,is due to the transition from the

Question # 12

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

Question # 13

Which of the following is not charged particle

Question # 14

A 4f orbital has

Question # 15

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

Question # 16

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

Question # 17

Proton was discovered by:

Question # 18

Rutherford's atomic model suggests the existence of

Question # 19

n + l value for 4f will

Question # 20

Rutherford's model of atom failed because:

Question # 21

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

Question # 22

The limiting line of Blamer series in hydrogen spectrum lies in

Question # 23

Which is not true with respect to cathode rays?

Question # 24

The degenerate orbitals p-sub shell are

Question # 25

When electrons revolve in stationary orbits

Question # 26

Pauli's principle is applicable to

Question # 27

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

Question # 28

Subsidiary quantum number specifies

Question # 29

In Millikan method for determination of charge on electron the air in the chamber is ionized by

Question # 30

An electron with n = 3 , l = 2 will be in the sub-shell

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 The credit of discovering neutron goes to
A. Rutherford
B. Langmuir
C. Chadwick
D. Austen
2 For which of the following sets of quantum numbers and electron will have the highest energy?
A. 3,2,1,1/2
B. 4,2,-1,1/2
C. 4,1,0,-1/2
D. 5,0,0,1/2
3 Which of the following element's outermost orbits last electron has magnetic quantum number m=0?
A. Na
B. O
C. Cl
D. N
4 Effective magnetic moment of Sc3+ion is
A. 1.73
B. 0
C. 5.92
D. 2.83
5 Balmer's series is in ______ region
A. Visible
B. U V
C. I. R.
D. None
6 The total number of orbitals possible for the quantum number n is
A. n
B. n2
C. 2n
D. 2n2
7 The mass of the neutron is of the order of
A. 10-23 kg
B. 10-24kg
C. 10-26kg
D. 10-27kg
8 Pauli's principle is applicable to
A. Degenerate orbits
B. Two electrons in the same orbital
C. One electron
D. None
9 The radius of first orbit of hydrogen atom
A. 0.329 A°
B. 0.429 A°
C. 0.529 A°
D. 0.229 A°
10 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

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