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 model of atom failed because:

Question # 2

The ratio of the ionization energy of H and Be3+is

Question # 3

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

Question # 4

The charge of an electron is determined by

Question # 5

Which of the following orbitals have a dumb bell shape?

Question # 6

The four quantum numbers of the valency electron of potassium are

Question # 7

Smallest charge of electricity that has been measured so far is

Question # 8

Balmer's series is in ______ region

Question # 9

Which of the following is not a property of cathode rays

Question # 10

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

Question # 11

Number of neutrons in heavy hydrogen atom is

Question # 12

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

Question # 13

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

Question # 14

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

Question # 15

Which have better penetrating power

Question # 16

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

Question # 17

The electron in an atom

Question # 18

Charge to mass ratio of electron was discovered by:

Question # 19

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

Question # 20

Neutrons was discovered by

Question # 21

Which of the following was discovered first:

Question # 22

When 3p orbital is complete, the entering electron goes into

Question # 23

Splitting of spectral lines of the hydrogen atom under the influence or magnetic field is called

Question # 24

Schrodinger wave equation describes electron completely because

Question # 25

The electronic configuration of an atom/ion can be defined by the following

Question # 26

Which is not true with respect to cathode rays?

Question # 27

The number of neutrons in the element 94Be is

Question # 28

The divisibility of atom was shown by

Question # 29

The quantum number which determines the shape of the orbital is

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 Orbitals having same energy are called
A. Hybrid orbitals
B. Valence orbitals
C. Degenerate orbitals
D. D-orbitals
2 The credit of discovering neutron goes to
A. Rutherford
B. Langmuir
C. Chadwick
D. Austen
3 The symbol of the element whose atoms have the outer most electronic configuration 2s22p3is
A. N
B. Li
C. P
D. Na
4 An orbital can accommodate maximum two electrons with opposite spins according to
A. Heisenberg's principle
B. Aufbau principle
C. Hund's srule
D. Pauli exclusion principle
5 The uncertainty principle was stated only
A. De Brogilie
B. Heinsenberg
C. Einstein
D. Schrodinger
6 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
7 The de-Brogile wavelength of a particle with mass 1g and velocity 100 m/s is
A. 6.63 x 10-33m
B. 6.63 x 10-34m
C. 6.63 x 10-35m
D. 6.65 x 10-35m
8 Electrons arranged in orbitals according to the increasing order of their n + l values, this rule is named as
A. Hund's rule
B. Heisenberg's principle
C. Paulit exclusion principle
D. Auf bau principle
9 Negatively charged particle nature of cathode rays was first demonstrated in 1895 by:
A. Millikan.
B. J. Perrin.
C. Hittrof
D. J.J. Thomson.
10 For which of the following sets of quantum numbers and electron will have the highest energy?
A. 3,2,1,1/2
B. 4,2,-1,1/2
C. 4,1,0,-1/2
D. 5,0,0,1/2

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