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

00:00
Question # 1

Energy of electron in an orbit according to Bohr theory is negative due to

Question # 2

Which of the following has more unpaired d-electrons?

Question # 3

Photons of yellow colour are ______ energetic than violet colour

Question # 4

In Millikan method the oil droplet falls under the force of gravity but it moves upward due to

Question # 5

The e.m value for positive rays maximum for:

Question # 6

The total number of orbitals in a shell with principal quantum number 'n' is

Question # 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

Question # 8

Quantum number values for 2p orbitals are

Question # 9

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

Question # 10

The configuration 1s22s22p53s1shows

Question # 11

For a 3P subshell the set of principle and azimuthal quantum number is

Question # 12

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 # 13

The order of distance between the various Bohr orbits is

Question # 14

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 # 15

The nature of positive rays depend on:

Question # 16

Which of the following element's outermost orbits last electron has magnetic quantum number m=0?

Question # 17

The number of de-electrons retained in Fe2+ (At.No. of Fe = 26) ions is

Question # 18

Balmer's series is in ______ region

Question # 19

Smallest charge of electricity that has been measured so far is

Question # 20

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 # 21

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

Question # 22

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

Question # 23

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

Question # 24

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

Question # 25

The radiations with wavelength shorter than violet light are called

Question # 26

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

Question # 27

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

Question # 28

The quantum number which determines the shape of the orbital is

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

The nature of the positive rays depend on

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 The experimental evidences for the existence of atomic nucleus comes from:
A. Line spectrum of hydrogen.
B. Magnetic bonding of cathode rays.
C. Millikan oil drop experiment.
D. Scattering of alpha particles by thin metal foil.
2 Subsidiary quantum number specifies
A. size of orbital
B. shape of orbital
C. orientations of orbitals
D. Nuclear stability
3 Neutrons was discovered by
A. Mosely
B. Milliken
C. Chadwick
D. Ruherford
4 Which of the following is not charged particle
A. Proton
B. Electron
C. Neutron
D. Hydrogen nucleus
5 The range of visible spectrum is
A. 300 - 600 nm
B. 600 - 900 nm
C. 400 - 750 nm
D. 100 - 300 nm
6 1 erg of energy corresponds to
A. 6.02 x 1023J/mol
B. 6.02 x 1016J/mol
C. 1 erg/mol
D. 10-7J/mol
7 Which of the following orbitals have a dumb bell shape?
A. s
B. p
C. d
D. f
8 In Millikan method for determination of charge on electron the air in the chamber is ionized by
A. Protons
B. Electric field
C. X-rays
D. a - particles
9 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.
10 The wave number of the line emitted is 109.678 x 105m-1in the Lyman series when electron transition occurs

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