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

Question # 2

The radiations with wavelength shorter than violet light are called

Question # 3

The electron in an atom

Question # 4

An orbital can accommodate maximum two electrons with opposite spins according to

Question # 5

Quantum number values for 2p orbitals are

Question # 6

Charge of an electron is:

Question # 7

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

Question # 8

Rutherford's atomic model suggests the existence of

Question # 9

The range of visible spectrum is

Question # 10

Alpha rays consist of:

Question # 11

The wave length of electron as wave is 0.5 nm. What is the wave length in meter

Question # 12

e/m of cathode rays is same but for positive rays e/m changes by changing gas in the discharge tube because

Question # 13

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

Question # 14

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

Question # 15

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

Question # 16

For which of the following sets of quantum numbers and electron will have the highest energy?

Question # 17

Neutrons was discovered by

Question # 18

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

Question # 19

Cathode rays emitted from cathode are

Question # 20

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

Question # 21

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 # 22

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

Question # 23

The limiting line of Blamer series in hydrogen spectrum lies in

Question # 24

Which have better penetrating power

Question # 25

The principle quantum number describes

Question # 26

Maximum potential energy that an electron can have within the atom is:

Question # 27

The de-Brogile wavelength of a particle with mass 1g and velocity 100 m/s is

Question # 28

Negatively charged particle nature of cathode rays was first demonstrated in 1895 by:

Question # 29

When potassium metal is exposed to violet light

Question # 30

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

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 When 6d orbital is complete, the entering electron goes into:
A. 7f.
B. 7s.
C. 7p.
D. 7d.
2 The value of Plank's constant 'h' is
A. 6.625 x 10-34
B. 6.625 x 10-34J sec
C. 6.625 x 10-34KJ
D. 6.625 x 10-34K Cal
3 A 4f orbital has
A. one node
B. two node
C. three node
D. four nodes
4 An electron with n = 3 , l = 2 will be in the sub-shell
A. 3p
B. 3d
C. 3f
D. 3s
5 Orbitals having same energy are called
A. Hybrid orbitals
B. Valence orbitals
C. Degenerate orbitals
D. D-orbitals
6 Which one of the following statements is true about discovery of neutrons?
A. These particles were formed by the bombardment of Alpha-particles on Beryllium.
B. These particles are formed by the spiting of alpha-particles.
C. These particles were discovered by natural radioactivity.
D. None of above.
7 Effective magnetic moment of Sc3+ion is
A. 1.73
B. 0
C. 5.92
D. 2.83
8 The divisibility of atom was shown by
A. Stoney
B. J.J. Thomson
C. Millikan
D. Rutherford
9 Proton was discovered by:
A. Chadwick
B. J.J. Rhomson
C. Millikan.
D. Goldstein.
10 Anode is the surface on which probability of finding electron is:
A. 50%
B. Less than 10%.
C. More than 95%.
D. Zero.

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