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 ratio of the ionization energy of H and Be3+is

Question # 2

In which of the following pairs, the numbers of electrons in the outermost shell are different?

Question # 3

In the ground state, an element has 13 electrons in its M shell. The element is

Question # 4

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

Question # 5

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

Question # 6

When potassium metal is exposed to violet light

Question # 7

The charge over mass ratio of electron is:

Question # 8

Charge of an electron is:

Question # 9

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

Question # 10

The limiting line of Blamer series in hydrogen spectrum lies in

Question # 11

Positive particle in discharged tube is produced by ionization of gas molecules, which is caused by

Question # 12

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

Question # 13

The range of visible spectrum is

Question # 14

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

Question # 15

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

Question # 16

The orbitals having n + l = 5 are

Question # 17

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

Question # 18

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

Question # 19

Alpha rays consist of:

Question # 20

The radius of second Bohr's orbit is

Question # 21

E = hv is the

Question # 22

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

Question # 23

The maximum number of electrons in a subshell for which l = 3 is

Question # 24

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

Question # 25

The size of electronic shell is described by

Question # 26

The wave number of the light emitted by a certain source is 2 x 106m-1. The wavelength of this light will be

Question # 27

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

Question # 28

Which of the following is not isoelectronic?

Question # 29

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

Question # 30

When electrons revolve in stationary orbits

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 When electron jumps from n2= 2,3,4,5,.... orbit to n1= 1 orbit in the hydrogen atom, the radiations emitted give the spectral lines
A. Lyman series
B. Blamer series
C. Paschen series
D. Brackett series
2 What is the packet of energy called?
A. Electron
B. Photon
C. Positron
D. Proton
3 Anode is the surface on which probability of finding electron is:
A. 50%
B. Less than 10%.
C. More than 95%.
D. Zero.
4 The e.m value for positive rays maximum for:
A. Oxygen.
B. Nitrogen.
C. Helium.
D. Hydrogen.
5 The radius of first orbit of hydrogen atom
A. 0.329 A°
B. 0.429 A°
C. 0.529 A°
D. 0.229 A°
6 If the value of principal quantum number is 3. the total possible values for magnetic quantum number will be
A. 1
B. 4
C. 9
D. 12
7 Neutrons was discovered by
A. Mosely
B. Milliken
C. Chadwick
D. Ruherford
8 The maximum number of electrons in a subshell for which l = 3 is
A. 14
B. 10
C. 8
D. 4
9 An electron has principal quantum number 3. The number of its 1 subshell and 2 orbitals would be respectively
A. 3 and 5
B. 3 and 7
C. 3 and 9
D. 2 and 5
10 The velocity of photon is:
A. Independent of its wavelength.
B. Depends on its wavelength.
C. Equal to square of its amplitude
D. Depends on its source.

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