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

When an electric current is passed through discharge tube at low pressure, cathode rays are emitted from cathode these rays consist of:

Question # 2

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

Question # 3

The uncertainty principle was stated only

Question # 4

Mass of simple electron is:

Question # 5

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

Question # 6

The velocity of photon is:

Question # 7

The number of electrons in the M shell of the element with atomic number 24 is

Question # 8

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

Question # 9

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

Question # 10

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

Question # 11

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

Question # 12

When potassium metal is exposed to violet light

Question # 13

The degenerate orbitals p-sub shell are

Question # 14

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

Question # 15

Which one of the following particles has amass 1/1836 time, that of hydrogen?

Question # 16

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

Question # 17

Rutherford's atomic model suggests the existence of

Question # 18

Balmer's series is in ______ region

Question # 19

With the reference of w/m ratio of anode rays, the e/m ratio of cathode rays s:

Question # 20

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

Question # 21

Cathode rays emitted from cathode are

Question # 22

The limiting line of Blamer series in hydrogen spectrum lies in

Question # 23

Neutron was discovered by:

Question # 24

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

Question # 25

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

Question # 26

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 # 27

The orbital in Rutherford's model is

Question # 28

What is the packet of energy called?

Question # 29

The quantum number which determines the shape of the orbital is

Question # 30

Effective magnetic moment of Sc3+ion is

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 The correct set of quantum numbers (n,l and m) respectively of the unpaired electron of chlorine atom is
A. 2,1,0
B. 2,1,1
C. 3,1,1
D. 3,2,1
2 The symbol of the element whose atoms have the outer most electronic configuration 2s22p3is
A. N
B. Li
C. P
D. Na
3 Spectrum of white light is continuous becuase
A. Colors separated by dark spaces
B. There are no boundary lines between the colours
C. The radiations are in infrared region
D. The radiatins fall in ultraviolet region
4 Photons of yellow colour are ______ energetic than violet colour
A. More
B. Less
C. Equal
D. None
5 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.
6 Subsidiary quantum number specifies
A. size of orbital
B. shape of orbital
C. orientations of orbitals
D. Nuclear stability
7 If the value of azimuthal quantum number is 3, then values of m the magnetic quantum no. will be
A. 0, 1, 2, 3
B. +3, +2, +1, -1, -2, -3
C. 0, -1, -2 ,-3
D. -3, 0, +3
8 Anode is the surface on which probability of finding electron is:
A. 50%
B. Less than 10%.
C. More than 95%.
D. Zero.
9 The total number of orbitals in a shell with principal quantum number 'n' is
A. 2n
B. 2n2
C. n2
D. n + 1
10 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?
A. 6
B. 11
C. 17
D. 23

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