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 configuration 1s22s22p53s1shows

Question # 2

The nature of the positive rays depend on

Question # 3

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

Question # 4

The radius of first orbit of hydrogen atom

Question # 5

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

Question # 6

Which of the following is not isoelectronic?

Question # 7

Balmer's series is in ______ region

Question # 8

Charge to mass ratio of electron was discovered by:

Question # 9

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

Question # 10

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

Question # 11

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

Question # 12

The nature of positive ray depend on:

Question # 13

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

Question # 14

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

Question # 15

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

Question # 16

For principle quantum number n=4, the total number of orbitals having l = 3 is

Question # 17

Quantum number value for 2p orbitals are:

Question # 18

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

Question # 19

The total number of possible values of magnetic quantum number for the value of l=3 is

Question # 20

The energy of ionization of an atom is the energy difference between orbital

Question # 21

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 # 22

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

Question # 23

The charge of an electron is determined by

Question # 24

Smallest charge of electricity that has been measured so far is

Question # 25

The radius of first orbit of H-atom is

Question # 26

The divisibility of atom was shown by

Question # 27

The energy of the first electron is helium will be

Question # 28

Which of the following was discovered first:

Question # 29

E = hv is the

Question # 30

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

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 When the electron jumps form second third, fourth orbit to the fist orbit, the transitions are known as
A. Balmer series
B. Lyman series
C. Pfund series
D. Brackett series
2 The limiting line of Blamer series in hydrogen spectrum lies in
A. Visible regions
B. Ultraviolet region
C. Infrared region
D. x-rays region
3 The radius of first orbit of hydrogen atom
A. 0.329 A°
B. 0.429 A°
C. 0.529 A°
D. 0.229 A°
4 Which is not true with respect to cathode rays?
A. A stream of electrons
B. Charged particles
C. Move with speed as that of light
D. Can be deflected by magnetic fields
5 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
6 Energy of electron in first orbit of H atom is
A. -45.32 KJ/mole
B. -82.08 KJ/mole
C. -52.53 KJ/mole
D. -1313.31 KJ/mole
7 Which one of the following particles has amass 1/1836 time, that of hydrogen?
A. Neutron.
B. Proton.
C. Electron.
D. Positron.
8 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
9 What is the packet of energy called?
A. Electron
B. Photon
C. Positron
D. Proton
10 Number of neutrons in heavy hydrogen atom is
A. 0
B. 1
C. 2
D. 3

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