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

The wave number of the line emitted is 109.678 x 105m-1in the Lyman series when electron transition occurs

Question # 2

Proton was discovered by:

Question # 3

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

Question # 4

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

Question # 5

The four quantum numbers of the valency electron of potassium are

Question # 6

The nature of positive ray depend on:

Question # 7

No cathode rays are produced in the discharged tube when gas is under ordinary pressure even if voltage of 5000 to 10000 is applies. This reason is

Question # 8

Pauli's principle is applicable to

Question # 9

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

Question # 10

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

Question # 11

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

Question # 12

Alpha rays consist of:

Question # 13

Which have better penetrating power

Question # 14

The radiations with wavelength shorter than violet light are called

Question # 15

Heaviest particle is

Question # 16

Neutrons was discovered by

Question # 17

Cathode rays emitted from cathode are

Question # 18

Rutherford's experiment led to the discovery of

Question # 19

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

Question # 20

The total values of magnetic quantum number of subshell are five, the subshell is

Question # 21

The value of Plank's constant 'h' is

Question # 22

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

Question # 23

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

Question # 24

Subsidiary quantum number specifies

Question # 25

Their e/m, ratio resembles with that of electrons

Question # 26

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

Question # 27

The radius of first orbit of H-atom is

Question # 28

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 # 29

Which of the following orbitals have a dumb bell shape?

Question # 30

The arrangement of subshells in the ascending order of their energy on complete filing of 4f subshell the entering electrons goes to

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 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
2 Which of the atoms has 1s2, 2s2, 2px22p1y2p1zconfiguration
A. Nitrogen
B. Carbon
C. Fluorine
D. Oxygen
3 E = hv is the
A. Spectral equation
B. Plank's equation
C. de Broglie's equation
D. None of these
4 Cathode rays emitted from cathode are
A. Canal rays
B. Protons
C. Electrons
D. Positrons
5 Which one of the following particles has amass 1/1836 time, that of hydrogen?
A. Neutron.
B. Proton.
C. Electron.
D. Positron.
6 The credit of discovering neutron goes to
A. Rutherford
B. Langmuir
C. Chadwick
D. Austen
7 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
8 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
9 The total number of possible values of magnetic quantum number for the value of l=3 is
A. 3
B. 1
C. 5
D. 7
10 The e.m value for positive rays maximum for:
A. Oxygen.
B. Nitrogen.
C. Helium.
D. Hydrogen.

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