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

The mass of the neutron is of the order of

Question # 2

Quantum number value for 2p orbitals are:

Question # 3

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

Question # 4

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

Question # 5

1 erg of energy corresponds to

Question # 6

The charge of an electron is determined by

Question # 7

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

Question # 8

The value of charge on electron is

Question # 9

The radius of first orbit of hydrogen atom

Question # 10

Find the magnetic moment of a divalent ion in aqueous solution if its atomic number is 25

Question # 11

The uncertainty principle was stated only

Question # 12

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

Question # 13

Alpha rays consist of:

Question # 14

Which of the following is not charged particle

Question # 15

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

Question # 16

An electron with n = 3 , l = 2 will be in the sub-shell

Question # 17

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

Question # 18

Orbital having same energy is called:

Question # 19

In Bohr model of hydrogen atom the distance between adjacent orbits increases away from the nucleus, the energy difference between the orbits

Question # 20

Rutherford's model of atom failed because:

Question # 21

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

Question # 22

Mass of simple electron is:

Question # 23

Which of the following is not a property of cathode rays

Question # 24

Energy of electron in the infinite Bohr orbit of H-atom is

Question # 25

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

Question # 26

Orbitals having same energy are called

Question # 27

The quantum number which describes the shape of the orbital is

Question # 28

The quantum number which describe the orientation of the orbitals is

Question # 29

The electron in an atom

Question # 30

The valence orbital configuration of an element with atomic number 23 is

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 n + l value for 4f will
A. 2
B. 5
C. 7
D. 9
2 An electron with n = 3 , l = 2 will be in the sub-shell
A. 3p
B. 3d
C. 3f
D. 3s
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 of the following particles has longest wavelength, if they have same speed:
A. Proton.
B. Neutron.
C. Electron.
D. Positron.
5 Sodium chloride imparts a yellow colour to the Bunsen flame. This can be interpreted due to the
A. low ionization energy of sodium
B. sublimation of metallic sodium to give yellow vapour
C. emission of excess energy absorbed as a radiation in the visible region as a radiation in the visible region
D. photosenitivity
6 Which quantum number is sufficient to describe the electron is hydrogen atom?
A. l
B. n
C. m
D. s
7 A 4f orbital has
A. one node
B. two node
C. three node
D. four nodes
8 With the reference of w/m ratio of anode rays, the e/m ratio of cathode rays s:
A. Greater.
B. same.
C. Smaller.
D. Not fixed.
9 Which of the following element's outermost orbits last electron has magnetic quantum number m=0?
A. Na
B. O
C. Cl
D. N
10 When 6d orbital is complete, the entering electron goes into:
A. 7f.
B. 7s.
C. 7p.
D. 7d.

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