Which is one of the correct sequences of wavelength of radiations?

UV > Hard X - rays > In > Green

UV > Green > In > Hard X - rays

IR > Green > UV > Hard X - rays

UV > Hard X - rays > In > Green

IR > Hard X - rays > Green > UV

Neutron is a fundamental particle which carries?

A charge of +1 and mass of l unit

A charge —1 unit and no mass.

155 + Mcqs in Atomic Structure in Chemistry Page 2 McqOptions

51.	The number of unpaired electrons in Mn²⁺ is
A.	1
B.	3
C.	4
D.	5
Answer» E.

Discussion

52.	The atoms of the elements which have same number of neutrons are called
A.	Isobars
B.	Isotopes
C.	Isotones
D.	None
Answer» D. None

Discussion

53.	⁷Li₃ and ⁸Be₄ are called
A.	Isotopes
B.	Isobar
C.	Isotones
D.	None
Answer» D. None

Discussion

54.	Who discovered the Electron ?
A.	Chadwik
B.	Bohr
C.	Thomson
D.	Rutherford
Answer» D. Rutherford

Discussion

55.	Wavelength of X - rays is of the order of
A.	1 mm
B.	1 cm
C.	1 micron
D.	1 angstrom
Answer» E.

Discussion

56.	Which of the properties of the elements is a whole number ?
A.	Atomic mass
B.	Atomic number
C.	Atomic radius
D.	Atomic volume
Answer» C. Atomic radius

Discussion

57.	The number of neutrons in dipositive zine ion (Zn²⁺, mass number 70 and atomic number 30) is
A.	34
B.	36
C.	38
D.	40
Answer» E.

Discussion

58.	Consider the following part of spectra 1. visible 2. infrared 3. ultraviolet 4. microwave Which of the following is the correct sequance in which the wavelengths in crease ?
A.	4 - 3 - 1 - 2
B.	4 - 1 - 2 - 3
C.	3 - 2 - 1 - 4
D.	3 - 1 - 2 - 4
Answer» E.

Discussion

59.	Propagation of light quanta may be described by
A.	photons
B.	protons
C.	neutrons
D.	electrons
Answer» B. protons

Discussion

60.	The charge on position is equal to the charge on
A.	proton
B.	electron
C.	- particle
D.	neutron
Answer» B. electron

Discussion

61.	Which one of the following elements has two electrons in the K - shell only ?
A.	Hydrogen
B.	Helium
C.	Neon
D.	Sulphur
Answer» C. Neon

Discussion

62.	Which of the following has the longest wave length ?
A.	ultraviolet radiation
B.	y - radiation
C.	visible radiation
D.	infra red radiation
Answer» E.

Discussion

63.	Which electromagnetic radiation is emitted by radioactive substances
A.	y - rays
B.	Radio waves
C.	micro waves
D.	x - ray
Answer» B. Radio waves

Discussion

64.	Which is one of the correct sequences of wavelength of radiations?
A.	UV > Green > In > Hard X - rays
B.	IR > Green > UV > Hard X - rays
C.	UV > Hard X - rays > In > Green
D.	IR > Hard X - rays > Green > UV
Answer» C. UV > Hard X - rays > In > Green

Discussion

65.	Which of the following waves can propagate in a vacuum ? 1. Radio waves 2. Light waves 3. X - rays 4. Ultrasonic waves Select the correct answer using codes given below Codes:
A.	1, 2 and 3
B.	1, 2, 3 and 4
C.	2, 3 and 4
D.	1 and 4
Answer» B. 1, 2, 3 and 4

Discussion

66.	In a given atom, no two electrons can have the same value for all four quantum number. This is called
A.	Hund's rule
B.	Pauli's exclusion principle
C.	Uncertainty principle
D.	Aufbau's principle
Answer» C. Uncertainty principle

Discussion

67.	Electromagnetic radiation with maximum wavelength is
A.	ultraviolet
B.	radio waves
C.	X - rays
D.	infrared
Answer» C. X - rays

Discussion

68.	The particle with 13 protons and 10 electrons is
A.	AI - atom
B.	AI
C.	ion
D.	nitrogen isotope
E.	none of these
Answer» C. ion

Discussion

69.	Species containing same number of electrons are called
A.	Isotopes
B.	Isobars
C.	Isoelectronic
D.	Isotones
Answer» D. Isotones

Discussion

70.	Na⁺ ion is iso electronic with
A.	Li
B.	Mg
C.	Ca
D.	Ba
Answer» C. Ca

Discussion

71.	Which of the following atom contains the least number of neutrons
A.	U
B.	U
C.	U
D.	Np
Answer» B. U

Discussion

72.	Neutrino has
A.	charge +1, amss 1
B.	charge 0, mass 0
C.	charge -1, mass 1
D.	charge 0, mass 1
Answer» C. charge -1, mass 1

Discussion

73.	The fundamental particles present in equal numbers in neutral atoms are
A.	protons and electrons
B.	neutrons and electrons
C.	protons and neutrons
D.	protons and positrons
Answer» B. neutrons and electrons

Discussion

74.	The absolute value of charge on electron was determined by
A.	J.J. Thomson
B.	R.A. Millikan
C.	Rutherford
D.	Chadwick
Answer» C. Rutherford

Discussion

75.	Consider the following pairs of ions or atoms 1. Na⁺ and NC 2. Na⁺ and K⁺ 3. K⁺ and C^- In which of these pair are the ions/atoms iso-electronic with each other ?
A.	1, 2 and 3
B.	1 and 2
C.	2 and 3
D.	1 and 3
Answer» E.

Discussion

76.	Which of the ions is not having the configuration of Ne ?
A.	CI
B.	F
C.	Na
D.	Mg
Answer» B. F

Discussion

77.	Rydberg' s constant for hydrogen line is
A.	109678 cm
B.	109.678 cm
C.	1096.78 cm
D.	10.9678 cm
Answer» B. 109.678 cm

Discussion

78.

Match colunm-I and column-II
Column-I Column-II
A. Thomson model 1. Dual nature of electron
B. Rutherford model 2. Nuclear theory
C. Bohr's model 3. Plum pudding model
D. de-Broglie theory 4. Concept of quantization of energy

A.

A-3, B-4, C-2, D-1

B.

A-2, B-4, C-1, D-2

C.

A-2, B-1, C-3, D-4

D.

A-3, B-2, C-4, D-1

Answer» E.

Discussion

79.	The maximum number of electrons on a principle shell is
A.	n
B.	n
C.	2n
D.	3n
Answer» D. 3n

Discussion

80.	¹₁H is also known as
A.	Deutarium
B.	Tritium
C.	Protium
D.	None of these
Answer» D. None of these

Discussion

81.	The electronic configuration of atom / ion can be defined by which of the following ?
A.	Aufbau principle
B.	Pauli's exclusion principle
C.	Hund's rule
D.	All of the above
Answer» E.

Discussion

82.	The power of an atom to attract a shared pair of electron is called?
A.	Electron affinity
B.	Electronegativity
C.	Ionization potential
D.	Electropositivity
Answer» C. Ionization potential

Discussion

83.	Alpha-particles are fast moving
A.	Hydrogen atoms
B.	Electrons
C.	Helium nuclei
D.	Protons
Answer» D. Protons

Discussion

84.	The value of plank's constant is?
A.	6.626 X 1034 Js
B.	6.024 X 1023 Js
C.	6.626 X 1034 Js
D.	1.667 X 1028 Js
Answer» D. 1.667 X 1028 Js

Discussion

85.	The value of Redberg's constant (RH) is?
A.	1.09678 cm-1
B.	109678 cm-1
C.	109678 cm
D.	1.09678 cm
Answer» C. 109678 cm

Discussion

86.	Lyman series of spectral lines appear in the ____ portion of spectrum.
A.	Ultraviolet
B.	Infra red
C.	Visible
D.	All of above
Answer» B. Infra red

Discussion

87.	Electronegativity of fluorine is arbitrarily fixed as?
A.	2
B.	3
C.	4
D.	5
Answer» D. 5

Discussion

88.	If a beam of sunlight is passing through the prism, then the type of spectrum obtained is?
A.	Continuous spectrum
B.	Line absorption spectrum
C.	Line emission spectrum
D.	Band spectrum
Answer» B. Line absorption spectrum

Discussion

89.	The energy released when an electron is added to an atom is the gaseous state is called?
A.	Electron affinity
B.	Ionization potential
C.	Electronegativity
D.	Electropositivity
Answer» B. Ionization potential

Discussion

90.	P–Orbitals are ________ in shape?
A.	Spherical
B.	Dumb bell
C.	Diagonal
D.	Linear
Answer» C. Diagonal

Discussion

91.	The energy required to remove electron from an atom in gaseous state is called?
A.	Electronegativity
B.	Electron affinity
C.	Ionization energy
D.	Electropositivity
Answer» D. Electropositivity

Discussion

92.	An element has 18 electrons, and 20 .neutrons. Its charge is –2. What is its mass number?
A.	38
B.	39
C.	32
D.	40
Answer» E.

Discussion

93.	Neutron is a fundamental particle which carries?
A.	No charge and mass of one unit
B.	A charge of +1 and mass of l unit
C.	A charge —1 unit and no mass.
D.	No charge and no mass.
Answer» B. A charge of +1 and mass of l unit

Discussion

94.	Which one of the following is not a strong bond?
A.	Metallic bond
B.	Ionic bond
C.	Covalent bond
D.	van der Waals bond
Answer» E.

Discussion

95.	The maximum number of. electrons that can be accommodated by p — orbital is?
A.	6
B.	14
C.	2
D.	10
Answer» B. 14

Discussion

96.	The value of magnetic quantum number of the last electron of Na is?
A.	0
B.	2
C.	1
D.	3
Answer» B. 2

Discussion

97.	Mean distance between atoms in the range of
A.	25 nm
B.	2.5 nm
C.	0.28nm
D.	0.025 nm
Answer» D. 0.025 nm

Discussion

98.	Neutrons were discovered by?
A.	J.J. Thomson
B.	Faraday
C.	Dalton
D.	Chadwick
Answer» E.

Discussion

99.	Atomic mass of an element is equal to the sum of?
A.	Electron and proton
B.	None of the above
C.	Proton and neutron
D.	Electron and neutron
Answer» D. Electron and neutron

Discussion

100.	Particles that most effects material properties
A.	Neutrons
B.	Electrons
C.	Protons
D.	Valence electrons
Answer» E.

Discussion

Explore topic-wise MCQs in Chemistry.

The number of unpaired electrons in Mn2+ is

The atoms of the elements which have same number of neutrons are called

7Li3 and 8Be4 are called

Who discovered the Electron ?

Wavelength of X - rays is of the order of

Which of the properties of the elements is a whole number ?

The number of neutrons in dipositive zine ion (Zn2+, mass number 70 and atomic number 30) is

Consider the following part of spectra 1. visible2. infrared3. ultraviolet 4. microwaveWhich of the following is the correct sequance in which the wavelengths in crease ?

Propagation of light quanta may be described by

The charge on position is equal to the charge on

Which one of the following elements has two electrons in the K - shell only ?

Which of the following has the longest wave length ?

Which electromagnetic radiation is emitted by radioactive substances

Which is one of the correct sequences of wavelength of radiations?

Which of the following waves can propagate in a vacuum ?1. Radio waves2. Light waves 3. X - rays4. Ultrasonic wavesSelect the correct answer using codes given belowCodes:

In a given atom, no two electrons can have the same value for all four quantum number. This is called

Electromagnetic radiation with maximum wavelength is

The particle with 13 protons and 10 electrons is

Species containing same number of electrons are called

Na+ ion is iso electronic with

Which of the following atom contains the least number of neutrons

Neutrino has

The fundamental particles present in equal numbers in neutral atoms are

The absolute value of charge on electron was determined by

Consider the following pairs of ions or atoms1. Na+ and NC2. Na+ and K+3. K+ and C-In which of these pair are the ions/atoms iso-electronic with each other ?

Which of the ions is not having the configuration of Ne ?

Rydberg' s constant for hydrogen line is

Match colunm-I and column-IIColumn-IColumn-IIA.Thomson model1.Dual nature of electronB.Rutherford model2.Nuclear theoryC.Bohr's model3.Plum pudding modelD.de-Broglie theory4.Concept of quantization of energy

The maximum number of electrons on a principle shell is

11H is also known as

The electronic configuration of atom / ion can be defined by which of the following ?

The power of an atom to attract a shared pair of electron is called?

Alpha-particles are fast moving

The value of plank's constant is?

The value of Redberg's constant (RH) is?

Lyman series of spectral lines appear in the ____ portion of spectrum.

Electronegativity of fluorine is arbitrarily fixed as?

If a beam of sunlight is passing through the prism, then the type of spectrum obtained is?

The energy released when an electron is added to an atom is the gaseous state is called?

P–Orbitals are ________ in shape?

The energy required to remove electron from an atom in gaseous state is called?

An element has 18 electrons, and 20 .neutrons. Its charge is –2. What is its mass number?

Neutron is a fundamental particle which carries?

Which one of the following is not a strong bond?

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

The value of magnetic quantum number of the last electron of Na is?

Mean distance between atoms in the range of

Neutrons were discovered by?

Atomic mass of an element is equal to the sum of?

Particles that most effects material properties

The number of unpaired electrons in Mn²⁺ is

⁷Li₃ and ⁸Be₄ are called

The number of neutrons in dipositive zine ion (Zn²⁺, mass number 70 and atomic number 30) is

Consider the following part of spectra
1. visible
2. infrared
3. ultraviolet
4. microwave
Which of the following is the correct sequance in which the wavelengths in crease ?

Which of the following waves can propagate in a vacuum ?
1. Radio waves
2. Light waves
3. X - rays
4. Ultrasonic waves
Select the correct answer using codes given below
Codes:

Na⁺ ion is iso electronic with

Consider the following pairs of ions or atoms
1. Na⁺ and NC
2. Na⁺ and K⁺
3. K⁺ and C^-
In which of these pair are the ions/atoms iso-electronic with each other ?

Match colunm-I and column-II
Column-I Column-II
A. Thomson model 1. Dual nature of electron
B. Rutherford model 2. Nuclear theory
C. Bohr's model 3. Plum pudding model
D. de-Broglie theory 4. Concept of quantization of energy

¹₁H is also known as