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

Rutherford's atomic model suggests the existence of

Question # 2

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

Question # 3

Light emitted from a source has its wave length 500nm, then its wave number will be

Question # 4

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

Question # 5

Mass of simple electron is:

Question # 6

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 # 7

If the value of azimuthal quantum number is 3, then values of m the magnetic quantum no. will be

Question # 8

Spectrum of white light is continuous becuase

Question # 9

When 6s orbital is complete then next electron goes to

Question # 10

Photons of yellow colour are ______ energetic than violet colour

Question # 11

The range of visible spectrum is

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 value of Plank's constant 'h' is

Question # 14

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

Question # 15

The quantum number which determines the shape of the orbital is

Question # 16

Orbitals having same energy are called

Question # 17

Which of the following orbitals have a dumb bell shape?

Question # 18

The e.m value for positive rays maximum for:

Question # 19

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

Question # 20

1 erg of energy corresponds to

Question # 21

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 # 22

The experimental evidences for the existence of atomic nucleus comes from:

Question # 23

Rutherford's experiment led to the discovery of

Question # 24

Which of the following particles has longest wavelength, if they have same speed:

Question # 25

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

Question # 26

The orbital in Rutherford's model is

Question # 27

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

Question # 28

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

Question # 29

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 # 30

The energy of the first electron is helium will be

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 The total values of magnetic quantum number of subshell are five, the subshell is
A. S-subshell
B. P-subshell
C. D-subshell
D. F-subshell
2 Which of the following is not a property of cathode rays
A. They can produce x-rays when they strike a heavy metal anode
B. They can cause reduction reaction
C. They produce fluorescence in rare earth and minerals
D. They comprise neutral particles
3 In Millikan method the oil droplet falls under the force of gravity but it moves upward due to
A. Electric field
B. Magnetic field
C. Incident light
D. X-rays
4 The charge of an electron is determined by
A. J.J. Thomson
B. Crooks
C. Perrin
D. R.A.Millikan
5 Energy of electron in the infinite Bohr orbit of H-atom is
A. 0 KJ/mole
B. 1 KJ/mole
C. -1 KJ/mole
D. -1313.32 KJ/mole
6 The nature of positive rays depend on:
A. Nature of discharge tube.
B. Nature of resident gas.
C. Nature of electrode.
D. All of above.
7 Which of the following was discovered first:
A. Charge to mass ratio of electrons.
B. Mass of electrons.
C. Charge of electrons.
D. All of above at same time.
8 In which of the following pairs, the numbers of electrons in the outermost shell are different?
A. As,Sb
B. Ge,Sn
C. In,pt
D. Se,Te
9 With increasing principle quantum number, the energy difference between adjacent energy levels in H atom
A. Decreases
B. Increases
C. Remains constant
D. Decreases for low value of Z and increase for higher value of Z
10 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.

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