Chemistry Atomic Structure Online Mcqs Test

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Question 1

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

Answer

3d², 4s², 4p¹

Answer

3d³, 4s¹, 4p¹

Answer

3d³, 4s²

Question 2

2. The electron in an atom

Answer

Moves randomly around the nucleus

Answer

Has fixed space around the nucleus

Answer

Is stationary in various energy levels

Answer

Moves around its nucleus in definite energy levels

Question 3

3. X-ray are

Answer

High energy electrons

Answer

Of unknown nature

Answer

High energy photons

Answer

Radio isotopes

Question 4

4. The maximum number of electrons that can be accommodated by p – orbital is?

Question 5

5. The radiations emitted form hydrogen filled discharge tube show

Answer

Band spectrum

Answer

Absorption spectrum

Answer

Line spectrum

Answer

Continuous spectrum

Question 6

6. During a chemical reaction, atomic number

Answer

Changes alternately

Answer

Remains same

Answer

Changes and then is restored

Question 7

7. Rutherford’s experiment led to the discovery of

Answer

α -particle

Question 8

8. No two electrons is the same atom can have identical set of four quantum numbers. This statement is known as?

Answer

- Pauli’s Exclusion principle

Answer

- Hund’s rule

Answer

-(n + 1) rule

Answer

- Aufbaus rule

Question 9

9. The number of spherical nodes in 3p orbitals are

Question 10

10. P fund series are produced in the spectrum of hydrogen atom

Answer

When electrons jump down to 5th – orbit

Answer

When electrons jump down to 4th – orbit

Answer

When electrons jump down to 3rd – orbit

Answer

When electrons jump down to 2nd – orbit

Question 11

11. e/m ratio of the canal rays is less than that of cathode rays. The reason is

Answer

Greater charge of the canal ray particles

Answer

Greater mass and charge of the canal ray particles

Answer

Greater mass of canal ray particles

Answer

Actually e/m ratio of canal rays is greater than that of the cathode rays

Question 12

12. Positive rays give flash on

Answer

AgCl plate

Answer

AgNO₃ plate

Question 13

13. Which one of the following will have the maximum charge/mass ratio?

Answer

α particle

Question 14

14. Millikan used in atomizer

Question 15

15. In an X-ray tube electrons each of charge e are accelerated through V potential difference allowed to hit a metal target. The wavelength of the X-rays emitted is

Answer

Impossible to predict

Question 16

16. Positive particles in discharge tube is produced by ionization of gas molecules which is caused by

Answer

Cathode rays remove the electrons from gas molecules

Answer

Gas molecules collide with anode

Answer

Gas molecules produce X – rays

Answer

Gas molecules are at high temperature

Question 17

17. The total number of orbitals in a shell with principal quantum number ‘n’ is

Question 18

18. Mass number is equal to the

Answer

Number of protons + number of electrons

Answer

Number of neutrons + number of electrons

Answer

Number of protons + number of neutrons

Answer

Number of electrons

Question 19

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

Answer

Hund’s Rule

Answer

Pauli’s exclusion principle

Answer

Aufbau principle

Answer

All the above

Question 20

20. Hydrogen atom does not emit X-rays because

Answer

Its energy levels are too far apart

Answer

It has a single electron

Answer

It is too small in size

Answer

Its energy levels are too close to each other

Question 21

21. A 4f orbital has

Answer

Four nodes

Answer

Three node

Question 22

22. The letters s p d and f are used to represent which quantum numbers

Question 23

23. Photon of highest frequency will be absorbed when transition takes place from

Answer

2nd to 5th orbit

Answer

4th to 5th orbit

Answer

1st to 5th orbit

Answer

3rd to 5th orbit

Question 24

24. The value of e/m ratio of electron is

Answer

1.7588 x 10¹¹ C/kg

Answer

6.02 x 10²³ C/kg

Answer

9.1095 x 10¯³¹ C/kg

Answer

1.7588 x 10²⁰ C/kg

Question 25

25. When atom is in the ground state, the electron is present

Answer

Nearest to the nucleus

Answer

In the nucleus

Answer

Nearest to the valence shell

Answer

In the second shell

Question 26

26. Millikan determined the charge on electron in oil drop experiment. It value is

Answer

1.603 x 10¯²³ C

Answer

1.602 x 10¯²³ C

Answer

1.602 x 10¯¹⁹ C

Answer

6.625 x 10¯³⁴ C

Question 27

27. The radius of hydrogen atom in the ground state is 0.53 Å, the radius of ₃Li²⁺ in the similar state is

Question 28

28. At 200°C hydrogen molecules have velocity 10⁵ cm sec¯¹. The de-Broglie wavelength in this case is approximately

Question 29

29. The penetrating power of X-rays depends on their

Answer

Applied voltage

Answer

All of these

Question 30

30. The credit of discovering neutron goes to

Answer

Rutherford

Question 31

31. The radius of second Bohr’s orbit is

Answer

0.053/4 nm

Answer

0.053 x 4 nm

Answer

0.053 x 20 nm

Question 32

32. Almost the entire mass of an atom is concentrated in the

Question 33

33. Ruther fords planet like structure was defective and unsatisfactory because

Answer

Moving e-accelerate towards the nucleus

Answer

Continuous spectrum

Answer

Behavior of electron remain unexplained

Question 34

34. When electrons revolve in stationary orbits,

Answer

There is no change in energy level

Answer

They are gaining kinetic energy

Answer

There is increase in energy

Answer

They become stationary

Question 35

35. Choose the value of the Red berg’s constant among the following among the following

Answer

1.697 x 10⁷ m¯¹

Answer

1.9678 x 10⁷ m¯¹

Answer

1.007 x 10⁷ m¯¹

Answer

1.09678 x 10⁷ m¯¹

Question 36

36. Ionization energies of the elements of group A are greater than those of Group VI A. The reason is that

Answer

Group V A elements have greater shielding effect

Answer

Group VI A elements have greater shielding effect

Answer

Group V A elements half – filled atomic orbitals

Answer

Group V A element have less elector negativity

Question 37

37. Planks theory says energy is emitted

Answer

Simultaneously

Answer

In continuous manner

Answer

In the form of heat

Answer

Discontinuous manner

Question 38

38. Spectrum is produced due to

Answer

All have little contribution

Answer

Different colours

Answer

Different intensities

Answer

Different wavelength

Question 39

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

Question 40

40. Which of the air pressures is appropriate for the production of cathode rays in the discharge tube?

Answer

0.001 mm Hg

Answer

0.001 cm Hg

Question 41

41. Number of neutrons in heavy hydrogen atom is

Question 42

42. The mass of a neutron is times greater than the mass of electron

Question 43

43. Which one is not true about cathode rays

Answer

9.11 x 10¯³¹ kg

Answer

Cannot ionized

Answer

Cast shadow

Question 44

44. Canal rays are

Answer

Negative charged particles

Answer

Positive charged particles

Answer

Gamma radiation

Answer

Beam of neutrons

Question 45

45. The mass of the atom is determined by

Answer

Electron and neutron

Answer

Neutron and proton

Question 46

46. The maximum number of electrons in a sub-shell for which l = 3 is

Question 47

47. Charge of electron was measured by

Answer

Rutherford

Answer

J.J. Thomson

Question 48

48. The K, L and M shells of an atom are full. Its atomic number is

Question 49

49. Wavelength of electron was verified by

Answer

Davison and Garner

Question 50

50. The absolute charge of an electron is

Answer

1.6 x 10¯¹⁹ C

Answer

16 x 10¯¹⁹ C

Answer

-1.6 x 10¯¹⁹ C

Answer

+ 1.6 x 10¯¹⁹ C

Question 51

51. Subsidiary quantum number specifies

Answer

Shape of orbital

Answer

Nuclear stability

Answer

Orientations of orbital

Answer

Size of orbital

Question 52

52. When electron collide with heavy particles then which of the following is produced?

Answer

Alpha rays

Answer

Gamma rays

Question 53

53. Where does the cathode rays get deflected?

Answer

An electric field only

Answer

Both electric and magnetic field

Answer

A magnetic field only

Answer

None of these

Question 54

54. Space around nucleus where finding of electrons is maximum is

Answer

Electron cloud

Question 55

55. If Z represents the atomic number and A represents mass number, then the number of electrons in an atom can be computed as

Question 56

56. Pressure in gas discharge tube was kept

Question 57

57. The symbol of the element whose atoms have the outer most electronic configuration 2s² 2p³ is

Question 58

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

Question 59

59. The proton is heavier than an electron by

Answer

1840 times

Answer

1850 times

Answer

1000 times

Question 60

60. The number of neutrons in the element ⁹₄Be is

Question 61

61. Quantum number tells the energy of electron

Question 62

62. An atom has a mass number of 23 and atomic number 11. The number of protons are

Question 63

63. The magnetic quantum number (QN) has its values determined directly by the value of

Answer

Azimuthal (QN)

Answer

Principal (QN)

Answer

Both a and b

Question 64

64. Heaviest particle is

Answer 134

Both a and b

Answer 135

Principal quantum number

Answer 136

Plank’s quantum theory

Answer 137

Rutherford’s atomic model

Answer 138

De-Broglie’s dual nature of atom

Answer 139

Bohr’s model

Answer 140

Hydrogen nucleus

Answer 141

α -particle

Answer 142

The nucleus is concentrated at the center

Answer 143

The nucleus carries the most of the mass

Answer 144

The nucleus carries positive charge

Answer 145

There is lot of empty space in atom

Answer 146

It remains same

Answer 147

Sometimes increases and sometimes decreases

Answer 148

It decreases

Answer 149

In the form of continuous waves

Answer 150

Nuclear radiations

Answer 151

In the form of quanta

Answer 152

Ultraviolet radiations

Answer 153

4, 2, -1, ½

Answer 154

4, 1, 0, -1/2

Answer 155

5, 0, 0, ½

Answer 156

3, 2, 1, ½

Answer 157

When electron jump to 3-orbit

Answer 158

When electron jump to 4-orbit

Answer 159

When electron jump to 5-orbit

Answer 160

When electron jump to 2-orbit

Answer 161

10¯²⁷ kg

Answer 162

10¯²⁴ kg

Answer 163

10¯²⁶ kg

Answer 164

10¯²³ kg

Answer 165

A Helium nucleus

Answer 166

An electron

Answer 167

A Hydrogen nucleus

Answer 168

Negative charged particles

Answer 169

Beam of neutrons

Answer 170

Gamma radiation

Answer 171

Positive charged particles

Answer 172

Bracket series

Answer 173

P fund series

Answer 174

Lymann series

Answer 175

Balmer series

Answer 176

In continuous manner

Answer 177

Discontinuous manner

Answer 178

Simultaneously

Answer 179

Never emit energy

Answer 180

Angular momentum (I)

Answer 181

Principal (p)

Answer 182

Magnetic (m)

Answer 183

Hard to locate

Answer 184

Colourless

Total Questions:	86
Time Allowed:	40 Minutes
Total Marks:	86
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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