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 range of visible spectrum is

Question # 2

The energy of the first electron is helium will be

Question # 3

The radius of first orbit of hydrogen atom

Question # 4

Which one of the following statements is true about discovery of neutrons?

Question # 5

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

Question # 6

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 # 7

Pauli's principle is applicable to

Question # 8

Schrodinger wave equation describes electron completely because

Question # 9

Which of the following particles has longest wavelength, if they have same speed:

Question # 10

Which of the following is not a sub-atomic particle

Question # 11

n + l value for 4f will

Question # 12

When 6d orbital is complete, the entering electron goes into:

Question # 13

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

Question # 14

The order of frequency of the following radiations unltraviolet, visible, infrared and microwave is

Question # 15

Which of the following was discovered first:

Question # 16

Which have better penetrating power

Question # 17

The credit of discovering neutron goes to

Question # 18

Alpha rays consist of:

Question # 19

Quantum number values for 2p orbitals are

Question # 20

Which quantum number is sufficient to describe the electron is hydrogen atom?

Question # 21

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

Question # 22

The mass of the neutron is of the order of

Question # 23

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

Question # 24

If the radius of first Bohr orbit be ao, then the radius of third Bohr orbit would be

Question # 25

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

Question # 26

Cathode rays drive a small paddle wheel placed in their path. This observation shows that

Question # 27

In the ground state of an atom the electron is present

Question # 28

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

Question # 29

Which of the following is not charged particle

Question # 30

Number of neutrons in heavy hydrogen atom is

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 Effective magnetic moment of Sc3+ion is
A. 1.73
B. 0
C. 5.92
D. 2.83
2 Consider the ground state of Cr atom (Z=24). The numbers of electrons with the azimuthal quantum numbers l = 1 and l = 2 are respectively
A. 12 and 4
B. 16 and 5
C. 16 and 4
D. 12 and 5
3 The quantum number which describes the shape of the orbital is
A. Principle quantum number
B. Spin quantum number
C. Azimathal quantum number
D. Magnetic quantum number
4 n + l value for 4f will
A. 2
B. 5
C. 7
D. 9
5 Which of the following is not a property of cathode rays
A. They can produce x-rays when they strike a heavy metal anode
B. They can cause reduction reaction
C. They produce fluorescence in rare earth and minerals
D. They comprise neutral particles
6 Smallest charge of electricity that has been measured so far is
A. Charge on a-rays
B. Charge on electron (1.602 x 10-19C)
C. Charge on x-rays
D. Charge on gamma rays
7 When 6d orbital is complete, the entering electron goes into:
A. 7f.
B. 7s.
C. 7p.
D. 7d.
8 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
9 The total values of magnetic quantum number of subshell are five, the subshell is
A. S-subshell
B. P-subshell
C. D-subshell
D. F-subshell
10 The charge over mass ratio of electron is:
A.

1.6 x 10-1 C Kg-1

B.

9.1 x 10-31 C Kg-1

C.

1.7588 x 1011 C Kg-1

D.

6.62 x 10-34 C Kg-1

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