Chemistry Atomic Structure MCQs Chapter 5 Class 11

Chemistry Atomic Structure MCQs – Chapter 5 Class 11

Chemistry Atomic Structure is a fundamental chapter of Class 11 Chemistry and is highly important for FSc Part-I exams and entry test preparation. MCQs from this chapter are frequently included in MDCAT, NUMS, AKU, NUST, UET ECAT, and board examinations. This chapter covers key topics such as discovery of subatomic particles, atomic models, electromagnetic radiation, atomic spectra, Bohr’s atomic model, quantum numbers, and electronic configuration.

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Chemistry Ch 5 Class 11 ATOMIC STRUCTURE

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1 / 70

Which of the following quantum numbers are for p-subshell?

2 / 70

The ground state of an atom corresponds to a state of :

NTS 2016 DUHS & JSMU
Chemistry
Atomic Structure
Elimination Tool:

A) Maximum energy

B) Minimum energy

C) Negative energy

D) Positive energy

3 / 70

Choose the value of the Rydberg constant among the following values:

NUMS 2014
Chemistry
Atomic Structure
Elimination Tool:

A) 1.09678 x 107 m-1

B) 1.602 x 10-19 C

C) 1.7588 x 1011 C

D) 1.007 x 107 m-1

4 / 70

The atomic number Z of an atom represents the:

NTS 2018
Physics
Atomic Structure
Elimination Tool:

A) Number of protons

B) Number of electrons and protons

C) Number of neutrons

D) Sum of protons and neutrons

5 / 70

The correct order of orbitals is:

1s,2s,2p,3s, 3p, 4s, 3d, 4p, 5s

1s,2s,2p,3s, 3p, 3d, 31, 4s, 5d

1s,2s,2p,3s, 3p, 3d, 4p, 4s, 5s

1s,2s,2p,3s, 3p, 4s, 4p, 4d, 5s

6 / 70

) The velocity of electron in outermost shell Is?

Minimum

Maximum

Intermediate

None of these

7 / 70

Which of the following orbital will be filled first than 4p?

NUMS 2020
Chemistry
Atomic Structure
Elimination Tool:

A) 4s

B) 2p

C) 3d

D) 1s

8 / 70

When B- particles are sent through a thin metal foil, most of them go straight through the foil as:

NTS 2017
Chemistry
Atomic Structure
Elimination Tool:

A) B- particles are much heavier than electrons

B) B- particles are positively charged

C) Most part of the atom is empty space

D) B- particles move with high velocity

9 / 70

For a multi-electron atom, the highest energy level among the following is:

NTS 2013
Chemistry
Atomic Structure
Elimination Tool:

A) n = 5, l = 0, m = 0 , s = + ½

B) n= 4 , l = 0 , m = 0 , s = – ½

C) n= 3 , l = 1, m = 1 , s = – ½

D) n= 5 , l = 1 , m = 0 , s = + ½

10 / 70

Which of the following best describes the emission spectrum of atomic hydrogen?

NTS 2015 DUHS and JSMU
Chemistry
Atomic Structure
Elimination Tool:

A) a discrete series of lines of equal intensity and equally spaced with respect to wavelength equally

B) a series of only four lines

C) a continuous emission of radiation of all frequencies

D) several discrete series of lines with both intensity and spacings between lines decreasing as the wavenumber increases with each series.

11 / 70

The maximum possible number of electrons a shell ‘n’ can accommodate is given by:

NTS 2012
Chemistry
Atomic Structure
Elimination Tool:

A) n

B) n2

C) 2n2

D) n3

12 / 70

What are the values of orbital quantum number/0 and magnetic quantum number(m) for subshell?

l=1,m=0,+1-1

l= 0,m= 0

l = 2, m = 0, +1-1, +/- 2

l = 3, m= 0, +/-1, +/- 2, +/-3

13 / 70

Which of the following does not have an inert gas configuration?

NUMS 2015
Chemistry
Atomic Structure
Elimination Tool:

A) Na+

B) Cu+

C) K+

D) S2-

14 / 70

The radius of the third Bohr orbit is:

NTS 2016 DUHS & JSMU
Chemistry
Atomic Structure
Elimination Tool:

A) 0.529 Å

B) 0.529 / 4 Å

C) 0.529 x 2 Å

D) 0.529 x 32 Å

15 / 70

The difference between soft and hard X-rays is of:

NUMS 2016
Physics
Atomic Structure
Elimination Tool:

A) Velocity

B) Intensity

C) Frequency

D) Polarization

16 / 70

When alpha particles are bombarded on beryllium

17 / 70

If an electron makes a transition from 4th orbit to inner orbits, then the wavelength for which the radius is maximum, lies in which of the following series?

Lyman series

Paschen series

Brackett serie

Pfund series

18 / 70

If uncertainty in the position of an electron is zero the uncertainty in its Momentum is?

NTS 2015 DUHS and JSMU
Chemistry
Atomic Structure
Elimination Tool:

B) Zero

C) 2 x pi x r

D) >h/4pi

E) Infinite

19 / 70

In a discharge tube, at room pressure there is

Maximum discharg

Minimum discharge

No discharge

Moderate dischil

20 / 70

Spectrum of which series is in the visible region?

Lyman series

Balmer series

Paschen series

Pfund series

21 / 70

A 4s orbital has:

NUMS 2014
Chemistry
Atomic Structure
Elimination Tool:

A) One node

B) Two nodes

C) three nodes

D) O nodes

22 / 70

If an electron of hydrogen atom jumps from 5th orbit to 7’h orbit, its atomic radius increases

97%

98%

50%

None of these

23 / 70

J.J Thomson determined the:

NTS 2016 DUHS & JSMU
Chemistry
Atomic Structure
Elimination Tool:

A) Charge of an electron

B) Mass of an electron

C) e/m value of an electron

D) Charge of a proton

24 / 70

Bracket series of 14-atom is in which of the following regions of electromagnetic spectrum?

Far infrared

Near infrared

Infrared

Visible

25 / 70

Quantum number values for ‘2p’ orbitals are:

PMC 2020
Chemistry
Atomic Structure
Elimination Tool:

A) n=2, l=1

B) n=1, l=2

C) n=1, l=0

D) n=2, l=0

26 / 70

The quantum numbers +½ and -½ for the electron spin represent:

NTS 2017
Chemistry
Atomic Structure
Elimination Tool:

A) Rotation of the electron in clockwise and anticlockwise direction respectively

B) Rotation of the electron in anticlockwise and clockwise direction respectively

C) Magnetic movement of the electron pointing up and down respectively

D) Two quantum mechanical spin states which have no classical analogue

27 / 70

Which quantum number decides energy of orbitals?

Magnetic quantum number

Principal quantum number

Azimuthal quantum number

All of these

28 / 70

If an electron jumps from fourth to first orbit, which of the following series will it show?

Lyman

Balmer

Pfund

None of these

29 / 70

Which is the configuration of Cr?

NUMS 2015
Chemistry
Atomic Structure
Elimination Tool:

A) [Ar] 3d4 4s2

B) [Ar] 3d5 4s1

C) [Ar] 3d6 4s1

D) [Ar] 3d1 4s2

30 / 70

The maximum number of electrons in an atom with n=3 and l=2 is:

NUMS 2015
Chemistry
Atomic Structure
Elimination Tool:

A) 10

B) 6

C) 18

D) 0

31 / 70

Which of the following fundamental particles have the same mass/kg?

NUMS 2020
Chemistry
Atomic Structure
Elimination Tool:

A) Electron, neutrino

B) Electron, proton

C) Proton, neutrino

D) Neutron, proton

32 / 70

Many elements have fractional atomic masses. This is because:

NUMS 2020
Chemistry
Atomic Structure
Elimination Tool:

A) Mass of atom is itself reactional

B) Atomic masses are average masses of isobars

C) Atomic masses are average masses of isotopes

D) Atomic masses are average masses of isotopes proportional to their abundance

33 / 70

Which orbitals always possess same energy:

Hybrid orbitals

Degenerate orbitals

None of these

Both a and b

34 / 70

Diameter of Hydrogen atom is?

105.8 x 10-2 A

1.061 A

0.55 A

131.3 x 10-2A

35 / 70

The lightest positive rays obtained is from:

NUMS 2020
Chemistry
Atomic Structure
Elimination Tool:

A) Hydrogen gas

B) Helium

C) Neon

D) Air

36 / 70

Maximum ____ electrons can be placed in one orbital:

NUMS 2020
Chemistry
Atomic Structure
Elimination Tool:

A) 1

B) 2

C) 3

D) 4

37 / 70

Electronic configuration of K is:

NUMS 2014
Chemistry
Atomic Structure
Elimination Tool:

A) [Ar] 4s2

B) [Ar] 4s1

C) [Kr] 4s1

D) [He] 4s1

38 / 70

Mass of electron in a.m.u is:

NUMS 2020
Chemistry
Atomic Structure
Elimination Tool:

A) 1.0073

B) 1.0087

C) 5.485 x 10-4

D) 9.1 x 10-31

39 / 70

Which of the following does not show variable valency?

NUMS 2015
Chemistry
Atomic Structure
Elimination Tool:

A) Mn

B) Fe

C) Zn

D) Cr

40 / 70

“In an atom no two electrons can have the some set of four Quantum numbers” is stated by:

NTS 2013
Chemistry
Atomic Structure
Elimination Tool:

A) Heisenberg’s uncertainty principle

B) Aufbau Principle

C) Pauli's Exclusion principle

D) Hund's Rule

41 / 70

Which pair has 1 electron in it’s ‘s’ orbital?

PMC 2020
Chemistry
Atomic Structure
Elimination Tool:

A) Li & Fe

B) Na & Cr

C) K & Mn

D) H & He

42 / 70

Which of the following is the electronic configuration of 19K?

NUMS 2016
Chemistry
Atomic Structure
Elimination Tool:

A) 1s2, 2s2, 2p6, 3s2, 3p6, 4s2

B) 1s2, 2s2, 2p6, 3s2, 3p6, 3s2, 3d1

C) 1s2, 2s2, 2p6, 3s2, 3p6, 4s2, 3d5

D) 1s2, 2s2, 2p6, 3s2, 3p6, 4s1

43 / 70

The charge on one proton is:

NUMS 2019 Reconduct
Chemistry
Atomic Structure
Elimination Tool:

A) 1.602 x 10-31C

B) 1.602 x 10-27C

C) 1.602 x 10-19C

D) 1.602 x 10-11C

44 / 70

An element has configuration 2, 8, 1. It belongs to, ______.

NTS 2016 SMBBMC
Chemistry
Atomic Structure
Elimination Tool:

A) IA group and 3rd period

B) IIIA group and 1st period

C) IA group and 8th period

D) VIIA group and 3rd period

45 / 70

Which one of the following is not an isotope of hydrogen:

NUMS 2014
Chemistry
Atomic Structure
Elimination Tool:

A) Deuterium

B) Tritium

C) Ortho hydrogen

D) None of these

46 / 70

d subshell has

3 orbitals

5 orbitals

7 orbitals

12 orbitals

47 / 70

The electronic configuration of iron is:

NTS 2011
Chemistry
Atomic Structure
Elimination Tool:

A) 1s2 , 2s2 , 2p6 , 3s2 , 3p6 , 3d5 , 4s2

B) 1s2, 2s2 , 2p6 , 3s2 , 3p6 , 3d5, 4s1

C) 1s2 , 2s2, 2p6 , 3s2 , 3p6 , 3d6 , 4s2

D) 1s2 , 2s2 , 2p6 , 3s2 , 3p6 , 3d3 , 4s2

48 / 70

The number of electrons present in n=2 , l = 1 and m = 1, 0, -1 are:

NTS 2016 DUHS & JSMU
Chemistry
Atomic Structure
Elimination Tool:

A) 2

B) 6

C) 8

D) 10

49 / 70

Number of transitions possible for an electron in the 6th shell are

50 / 70

Nitrogen and phosphorus have 3 of their valence electrons unpaired because of:

NTS 2014
Chemistry
Atomic Structure
Elimination Tool:

A) Auf bau principle

B) Heisenberg's principle

C) Hund’s rule

D) Planck’s statement

51 / 70

The radii of the second orbit of the hydrogen atom calculated from Bohr’s model is:

NTS 2013
Chemistry
Atomic Structure
Elimination Tool:

A) 0.529 Å

B) 4.8 Å

C) 2.41 Å

D) 3.4 Å

52 / 70

Electronic configuration of M2+ ion is 2, 8, 14 and its atomic weight is 56 amu. The number of neutrons in its nucleus are:

NTS 2017
Chemistry
Atomic Structure
Elimination Tool:

A) 30

B) 32

C) 42

D) 52

53 / 70

The Neutron was discovered by:

NTS 2018
Chemistry
Atomic Structure
Elimination Tool:

A) Goldstein

B) Rutherford

C) J.J Thomson

D) Chadwick

54 / 70

Which of the following has the maximum number of unpaired electrons?

NUMS 2015
Chemistry
Atomic Structure
Elimination Tool:

A) Mg2+

B) V3+

C) Ti3+

D) Fe2+

55 / 70

Which of the following statements is correct?

NTS 2011
Chemistry
Atomic Structure
Elimination Tool:

A) Faraday's experiment indicates the existence of electrons

B) Crookes tube experiment shows the presence of electrons and protons in the atoms

C) Radioactivity confirms the presence of electrons and protons

D) Chadwick experiment shows the presence of neutrons

E) All of these

56 / 70

If an election jumps from 6th orbit to 2nd orbit then decrease in radius will be?

90%

60%

30%

20%

57 / 70

The Balmer series lies in which region of the electromagnetic spectrum?

NTS 2015 DUHS and JSMU
Chemistry
Atomic Structure
Elimination Tool:

A) Ultraviolet

B) Visible

C) Infrared

D) Microwave

58 / 70

Shape of the orbital occupied by an electron is defined by:

NTS 2016 DUHS & JSMU
Chemistry
Atomic Structure
Elimination Tool:

A) Principal quantum number

B) Azimuthal quantum number

C) Spin quantum number

D) Magnetic quantum number

59 / 70

The amount of energy associated with quantum of radiation is directly proportional to:

NUMS 2020
Chemistry
Atomic Structure
Elimination Tool:

A) Photon

B) Wavelength

C) Frequency

D) Velocity

60 / 70

The relationship between quantum number n and l is:

PMC 2020
Chemistry
Atomic Structure
Elimination Tool:

A) n = l – 1

B) l = n – 2

C) l = n – 1

D) n = l – 2

61 / 70

P.E of an electron in the orbit of an atom Is

Zero

Less than zero

Greater than zero

None of these

62 / 70

How many electrons can have the values n=2, l=1, and s=+½ in the configuration 1s2, 2s2, 2p3?

NTS 2015 DUHS and JSMU
Chemistry
Atomic Structure
Elimination Tool:

A) 1

B) 3

C) 5

D) 7

63 / 70

Diameter of an atom is in the range of?

NUMS 2014
Chemistry
Atomic Structure
Elimination Tool:

A) 0.2m

B) 0.2 nm

C) 2 x 10^-19nm

D) 0.2 pm

64 / 70

Which of the following has lowest e/m ratio?

PMC 2020
Chemistry
Atomic Structure
Elimination Tool:

A) Li+2

B) H+

C) He+

D) Be

65 / 70

Spectrum of which series is in the UV region?

Lyman serie

Balmer series

Paschen series

Pfund series

66 / 70

The amount of energy released by absorbing an electron in the valence shell is:

NTS 2013
Chemistry
Atomic Structure
Elimination Tool:

A) Ionization Energy

B) Electron Affinity

C) Electronegativity

D) Atomic Radius

67 / 70

The maximum number of electrons that an orbital can accommodate is/are:

NTS 2010
Chemistry
Atomic Structure
Elimination Tool:

A) 0

B) 1

C) 2

D) 3

68 / 70

Breaking of neutron produces?

Electron, proton and neutrino

Electron, positron and neutrino

Proton and positron

Alpha particles

69 / 70

X-rays are defined as:

NUMS 2020
Chemistry
Atomic Structure
Elimination Tool:

A) Electromagnetic radiations of high mass number

B) Electromagnetic radiations of very high frequency

C) Electromagnetic radiations of high wavelength

D) Electromagnetic radiations of high energy

70 / 70

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

NUMS 2014
Chemistry
Atomic Structure
Elimination Tool:

A) Hydrogen

B) Sodium

C) Oxygen

D) Li+

Your score is

The average score is 59%

Importance of Atomic Structure MCQs

A clear understanding of atomic structure helps students explain atomic behavior and solve numerical problems related to energy levels and spectra. Examinations often include MCQs based on atomic models, emission and absorption spectra, and electronic configurations. Practicing chapter-wise MCQs improves conceptual clarity, accuracy, and confidence for competitive exams.

Effective Strategy for Free Preparation

For effective preparation, students should revise important definitions and formulas, understand atomic models conceptually, and practice topic-wise MCQs regularly. Attempting free tests and past paper questions helps identify frequently tested concepts. PLS Academy provides structured MCQs and free resources to support Chemistry Atomic Structure preparation and other Class 11 Chemistry chapters.

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