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MDCAT Chemistry Chemical Bonding Test Online

Malik TahirLast Updated: May 24, 2025

Chemistry Chemical Bonding MCQS Online Test

MDCAT Chemistry Chemical Bonding Chapter Online Test

Total Questions:	187
Time Allowed:	60 Minutes
Total Marks:	187
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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MDCAT Chemistry Chemical Bonding Test

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Page 1 of 8

Chemistry

1. Outermost shells of two elements X and Y have two and six electrons respectively. If they combine, the expected formula of compound will be

XY₂

X₂Y

X₂Y₃

2. Which kinds of bonding can be found in a sample of H₂O(l)?

Nonpolar covalent bonds only

Ionic and nonpolar hydrogen bonds

Hydrogen bonds only

Both polar covalent and hydrogen bonds

3. The correct set of quantum numbers (n, l and m) respectively of the unpaired electron of chlorine atom is:

3, 2, 1

2, 1, 0

3, 1, 1

2, 1, 1

4. Pi bonds are produced by overlapping of

Atomic orbital and hybrid orbital

Hybrid orbitals

Hybrid and un hybrid orbitals

Un-hybrid orbitals

5. The energy of a photon is given as, ∆ E/atom = 3.03 x 10¯¹⁹ J atom¯¹ then, the wavelength (λ) of the photon is

65.6 nm

6.56 nm

0.656 nm

656 nm

6. Which one of these is weakest?

Covalent bond

Ionic bond

Metallic bond

Van der Waal’s forces

7. According to VSPER theory, ammonia molecule has --------- shape

Triangular

Pyramidal

Trigonal

Tetrahedral

8. Which molecule is polar among the following?

Ethane

Methanol

Carbon tetrachloride

Carbon dioxide

9. Which of the following value of Electronegativity difference corresponds the formation of Ionic Bond?

Greater than 1.7

Equal to 1.7

Lesser then 1.7

No specificity exist

10. Which of the following molecules has no net dipole moment?

HCl

H₂O

CCl₄

CH₃Cl

11. How many sigma and pi bonds are present in tetra cyano ethylene?

Five π and nine σ

Nine σ and seven π

Eight σ and eight π

Nine σ and nine π

12. For principle quantum number, n = 4, the total number of orbitals having 1 = 3 is

13. A long a period E.N __________ from left to right

Decreases

Variable trend

Increases

Constant

14. On sp3 hybridization

One s and 3 p-orbitals are involved

Four p-orbitals are involved

All p-orbitals are involved

One p-orbital is involved

15. Molecular orbitals are filled according to

Hund’s rule

Pauli’s exclusion principle

All these

Aufbau principal

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

Fourth Bohr orbit to the first Bohr orbit

Seventh Bohr orbit to the third Bohr orbit

Fifth Bohr orbit to the second Bohr orbit

Sixth Bohr orbit to the third Bohr orbit

17. Formulation of chemical bond between atoms of elements is based on

Electropositive character of elements

Octet rule

Pauli exclusion principle

Electronegative character of elements

18. The shape of the molecule SF₂Cl₂ is

Cubic

Tetrahedral

Octahedral

Trigonal bipyramidal

19. The bond angle H – O – H in ice is closest to

90°

109°

120°

60°

20. Pick out the molecule which has zero dipole moment

NH₃

H₂O

BCl₃

SO₂

21. Lateral overlapping expected in

Ā-bonds

Ionic bond

Metallic bond

O-bond

22. The structure of ICl₂¯ is

Trigonal

Square planar

Octahedral

Trigonal bipyramidal

23. Which of the following is a non-directional orbital

SP²

24. Nuclear radiation is emitted by those elements whose

Nuclei are stable

Nuclei are unstable

Molecules are unstable

Molecules are stable

25. The relative attraction of the nucleus for the electrons in a chemical bond is called

Electron affinity

None of these

Ionization energy

Electro negativity

Page 2 of 8

26. Which of the following is a non-directional orbital?

SP²

27. Select the arrangement of electromagnetic radiation which starts with the lowest energy and increases to the highest energy

Microwave, infrared, visible, ultraviolet

Visible, ultraviolet, infrared, gamma rays

X – radiation, visible, infrared, microwave

Radio, visible, infrared, ultraviolet

28. Which of the following has more unpaired d-electrons?

Zn⁺

Cu⁺

Fe²⁺

Ni³⁺

29. ____________ has their outermost shell complete in atomic form

Gun metals

Alkali metals

Noble gases

Coinage metals

30. Force responsible to hold atoms together in a compound is called

Interaction

Bond

All of above represent same entity

Attractive force

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

32. When potassium metal is exposed to violet light

The absorption of electrons takes place

There is no effect

Ejection of electrons takes place

Ejection of some potassium atoms occurs

33. Fluorine molecule is formed by

The axial p-p overlap

The axial s-p overlap

The sidewise p-p overlap

The overlap of two sp² hybrid orbitals

34. Which of the following has the greatest covalent character?

NaCl

AlCl₃

SiCl₄

MgCl₂

35. Which one of the following molecules shows high percentage of ionic character?

H₂O

HBr

HCl

36. Covalent compounds are soluble in

Concentrated acids

Non-polar solvents

All solvents

Polar solvents

37. Which of the bonds, shown by the ___________ has the greatest polarity?

H – SH

H – OH

H – NH₂

H – Cl

38. Which of the following equation represents the 1^st ionization energy of Na?

39. The configuration 1s² 2s² 2p⁵ 3s¹ shows

Excited state of neon

Ground state of fluorine atom

Excited state of O¯₂

Excited state of fluorine

40. An electron has principal quantum number 3. The number of its (i) subshells and (ii) orbitals would be respectively

3 and 7

3 and 5

3 and 9

2 and 5

41. The shape of ClO₃ according to valence shell electron pair repulsion theory will be

Pyramidal

Square planar

Tetrahedral

Planar triangle

42. Unit of dipole moment is

Newton

Debye

Pascal

Poise

43. A molecule in which sp² hybrid orbitals are used by the central atom in forming covalent bonds is

SO₂

He₂

N₂

PCl₅

44. The number of σ and π-bonds present in pent-4-en-l yne is

4, 9

10, 3

3, 10

9, 4

45. Effective magnetic moment of Sc³ ion is

2.83

1.73

5.92

46. A chemist poured juice on soil. Which idea may he have in his mind?

There may not be a possibility of chemical reaction

Water should be preferred over lemon Juice for drinking

There may be a possibility of a chemical reaction

Lemon juice is dangerous for health

47. Elements with ________ first ionization energies and ________ electron affinities generally from cations. Choose the correct point

High, very negative

Low very negative

None of these

Low, positive or slightly negative

48. Anti-bonding MO is formed by

None of these

Subtraction of atomic orbitals

Addition of atomic orbitals

Multiplication of atomic orbitals

49. Which of the following orbitals have a dumb bell shape?

50. In O2 each oxygen atom is hybridized

All

Sp2

Sp3

Page 3 of 8

51. Which of the following species is paramagnetic?

CN¯

O²¯

CO₂

52. Bond angle in water is

104.5°

120°

109.5°

107°

53. A lone pair of electrons in an atom implies

A pair of valence electrons

A pair of electrons

A pair of valence electrons not involved in bonding

A pair of electrons involved in bonding

54. 1 erg of energy corresponds to

6.02 x 10¹⁶ J/mol

6.02 x 10²³ J/mol

1 erg/mol

10¯⁷ J/mol

55. The de-Broglie wavelength of a particle with mass 1 g and velocity 100 m/s is

6.63 x 10¯³⁵ m

6.63 x 10¯³⁴ m

6.65 x 10¯³⁵ m

6.63 x 10¯³³ m

56. When two ice cubes are pressed over each other, they unite to form one cube. Which of the following forces is responsible to hold them together?

Van der Waal’s forces

Dipole interaction

Hydrogen bond formation

Covalent attraction

57. Which of the following is not absolute term of element?

Electronegativity

Electron affinity

Atomic size

Ionization energy

58. The number of significant figures in 0.00200 is

Five

Three

One

Two

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

Li⁺

He⁺

60. Bond order for N2 molecule is

61. Sodium chloride imparts a yellow colour to the Bunsen flame. This can be interpreted due to the

Photosensitivity of sodium

Low ionization energy of sodium

Sublimation of metallic sodium to give yellow vapour

Emission of excess energy absorbed as a radiation in the visible region

62. A student subtracted 0.00055 from 10.2345678 and reported the result as 10.23401. But his friend told him that result was wrong. What is the correct result?

10.234017

10.2340178

10.234

10.23

63. Which of the following hydrides has the lowest boiling point?

H₂S3

H₂Te

H₂O

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

He⁺

Li⁺

65. Maximum hydrogen bonds in water are,

66. Nitrogen gas is chemically inert gas due to the reason that

There is triple bond between nitrogen atoms which make the molecule quite stable

Some of the electrons are also present in anti-bonding molecular orbitals

It has high heat of dissociation

It has high electronegativity

67. The nature of inter-particle forces in benzene is

H-bonding

Ion-dipole interaction

Dispersion force

Dipole-dipole interaction

68. Ionic radius in a period from left to right

Decreases

Increases

First increases then decreases

First decreases then increases

69. Which hydrogen halide among the following has the highest percentage of ionic character?

HBr

HCl

70. The electronegativity of elements in a period from left to right

First increases then decreases

Decreases

First decreases then increases

Increases

71. The number and type of bonds between carbon atoms in calcium carbide are

One sigma, one pi

Two sigma, one pi

One sigma, two pi

Two sigma, two pi

72. Shape of CIO₃¯ is

Tetrahedral

Triangular pyramidal

Triangular planar

Triangular bipyramidal

73. Which one among the following does not have the hydrogen bond?

Liquid HCl

Liquid NH3

Water

Phenol

74. When two hydrogen atoms approach to form a chemical bond

The repulsive force dominate the attractive forces

They energy of atoms increases

The attractive forces dominate the repulsive forces

The two atoms start ionization

75. Find the magnetic moment of a divalent ion in aqueous solution if its atomic number is 25

5.9 BM

6.9 BM

3.0 BM

4.9 BM

Page 4 of 8

76. Ammonia has a net dipole moment while boron trifluoride has zero dipole moment because

NH₃ is pyramidal in shape while BF₃ is planar

Fluorides are more electronegative

Fluorides is more electronegative

Boron trifluoride is pyramidal in shape while NH₃ is planar

77. According to MO theory, the species O⁺₂ possesses

Stability lower then O₂

Bond order of 2.5

Three unpaired electrons

Diamagnetic character

78. The energy required to remove electron from an atom is called

E.A

E.N

Ea.

I.P

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

80. Geometry of simple molecule having sp3 hybrid orbital is

Tetrahedral

Triangular

Square planner

Linear

81. Which of the following would have a permanent dipole moment?

BF₃

SiF₄

SF₄

XeF₄

82. Which of the following species has lone pair of electrons on central atom?

N⁺H₄

CH₄

Pcl₄

PCl₃

83. Which of the following is the best explanation that CO₂ is a non-polar molecule?

None

Linear geometry

Dipole moment is zero

SP hybridization

84. Which orbital of the following has a principal quantum number of 3 and an angular momentum quantum number of 27?

85. Which has the minimum bond angle?

H₂S

CH₄

NH₃

H₂O

86. In BrF₃ molecule, the lone pairs occupy equatorial positions to minimize

Lone pair – bond pair repulsion only

Lone pair – lone pair repulsion only

Bond pair – bond pair repulsion only

Lone pair – lone pair repulsion and lone pair – bond pair repulsion

87. In which one of the following does the central atom not possess can octet in its outer shell?

BH₃

NH₃

CH₄

H₂O

88. Which of the following has unchanged valency?

Oxygen

89. Which of the following is not isoelectronic?

Mg²⁺

O²¯

Cl¯

Na⁺

90. Which of the sub – atomic particles is not charged?

Electron

All these

Neutron

Proton

91. Electronic configuration of K is

[Kr]4S¹

[AR]4S²

[AR]4S¹

[He]4S¹

92. Unit of dipole moment is

Poise

Pascal

Debye

Newton

93. In acetylene molecule, the two carbon atoms are linked by

Two sigma bonds and one pi-bond

Three pi-bonds

One sigma bond and two pi-bonds

Three sigma bonds

94. According to VESPR Model the geometry of molecule having 5 bond pair in outer most shell will be

Trigonal bipyramidal

Square planner

Octahedral

Triangular

95. Number of π-bonds in naphthalene is

96. 2nd orbit is away from nucleus for H-atom as compared to first orbit

6-times

3-times

4-times

2-times

97. Water (H₂O) is liquid while hydrogen sulphide (H₂O) is a gas because

Sulphure has high electronegativity than oxygen

Hydrogen sulphide is a weak acid

Water has higher molecular weight

Water molecules associate through hydrogen bonding

98. Which of the following molecules does not have a net dipole moment?

BrF₃

NH₃

BF₃

H₂O

99. In Millikan oil – drop experiment, the charges on several different oil drops were as: -5.92. – 4.44, -2.96, -8.88. The units are arbitrary. Choose the likely value of the electronic charge in these arbitrary units?

-2.22

-1.11

-2.96

-1.48

100. The energy of the first electron in helium will be

-5.44 eV

Zero

-54.4 eV

-13.6 eV

Page 5 of 8

101. The number of anti-bonding electron pairs in O₂²¯ molecular ion on the basis of MOT is

102. Which of the following has zero depolemoment?

PCl₃

CFCl₃

SiF₄

ClF

103. The number of d-electrons retained in Fe²⁺ (At. No. of Fe = 26) ions is

104. When 2 lone pair and 2 bond pair are around the central atom reduction in the bond angle is up to. (in degrees)

107.5

102

109.5

104.5

105. The four quantum numbers of the valency electron of potassium are

4, 4, 0, ½

4, 0, 0, ½

4, 1, 1, ½

4, 1, 0, ½

106. Azimuthal quantum number of last electron of ₁₁Na is

107. Noble gases are most stable of all other elements because

They do not react with one another

They have high ionization energies

They have completely filled s and p orbitals

They are mono atomic gases

108. The relative attraction of the nucleus for the electrons in a chemical bond is called

None of these

Ionization energy

Electronegativity

Electron affinity

109. Inter molecular forces in solid hydrogen are

Van der Waal forces or London dispersion forces

Covalent forces

Hydrogen bonds

All of these

110. If the radius of first Bohr orbit be ɜ₀, then the radius of third Bohr orbit would be

1/2 x ɜ₀

6 x ɜ₀

3 x ɜ₀

9 x ɜ₀

111. The total number of possible values of magnetic quantum number for the value of l = 3 is

112. Energy of an atom in a compound is

Impossible to predict

Higher than individual

Lesser than individual

No change

113. Choose the correct statement about 2nd ionization energy

It is always less than 1st ionization energy

It is always greater than 1st ionization energy

It is equal to the 1st ionization energy

It may be greater or less than the 1st ionization depending upon ht nature of the element

114. Which of the following is to isoelectronic with rest of three?

K⁺

S¯²

Cl¯

Na⁺

115. Fluorine has an atomic number 9 and Chlorine has 17. Which one has the highest electron affinity?

Cannot be determined

Both are equal

116. Which of the following contains both polar and non-polar bonds?

CH₄

NH₄Cl

HCN

H₂O₂

117. Which one of the following pairs of atoms is most likely to form an ionic bond?

Na and F

N and F

C and F

O and F

118. Element having the smallest atomic radius among the following is

119. Choose the correct statement

As bonding molecular orbitals become more stable, anti-bonding molecular orbital become equally less stable

The molecular orbitals in a molecule equals twice the number of constituent atomic orbitals

Each bonding molecular orbital can accommodate only one electron

In molecular orbitals, the number of bonding electrons equals the number of anti-bonding electrons

120. The bond order in NO is 2.5 while that is NO⁺ is 3. Which of the following statements is true for these two species?

Bond length is unpredictable

Bond length in NO⁺ is equal to that in NO

Bond length in NO is greater than in NO⁺

Bond length in NO⁺ is greater than in NO

121. Quantum umber values for 2p orbitals are

n = 1, l = 0

n = 2, l = 0

n = 2, l = 1

n = 1, l = 2

122. When a double bond is formed between two atoms, one of the bonds is a sigma bond and the other is a pi bond. The pi bond is created by the overlap of……

sp² hybrid orbitals

p orbitals

sp³ hybrid orbitals

s orbitals

123. Which of the following molecule has Ā bond

C₃H₆

O₂

NH₃

H₂O

124. Deflection of blue light is lesser than violet because

Blue has more energy

Blue is absorbed more easily

Blue is darker colour

Blue has higher wavelength

125. If the value of principal quantum number is 3, the total possible values for magnetic quantum number will be

Page 6 of 8

126. The nature of positive rays depends upon

The nature of discharge tube

The nature of electrode

The nature of residual gas

All of these

127. The central atom in BrF₅ has _?_ bonding pairs of electrons and _?_ non-bonding pairs of electrons.

0….5

1….5

5….0

5….1

128. The velocity of photon is

Equal to square

Independent of its wavelength

Depends on its wavelength

Depends on its source

129. How many molecular orbitals may be constructed from the valence shell orbitals of the constituent atoms in CH₄?

130. Al become isoelectronic with Ne

By losing two electrons

By gaining three electrons

By losing three electrons

By gaining two electrons

131. Atom with higher atomic number produces X-rays of

Shorter wavelength

X-rays not produced

Gamma rays

Larger wavelength

132. In a double bond connecting two atoms there is a sharing of

4 electrons

6 electrons

1 electron

2 electrons

133. If atomic numbers of nickel and copper are 28 and 29 respectively. Which of the following does the electronic configuration 1s² 2s² 2p⁶3s²3p⁶3d⁹ represent?

Cu⁺

Ni²⁺

Cu²⁺

134. The carbon atoms in calcium carbide are held by

2π and one σ bond

2 sigma bonds

Ionic bonds

2 covalent, one co-ordinate bond

135. Among the alkaline earth metals the element forming predominantly covalent compounds is

Calcium

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

137. XeF₄ has shape of

Square planar

Trigonal bipyramidal

Tetrahedral

Sphere

138. Number of sigma bonds in P₄O₁₀ is

139. The relative attraction of the nucleus for the electrons in a chemical bond is called

Electro negativity

None of these

Ionization energy

Electron affinity

140. Which one shows high % age of the ionic character?

HCI

HBr

H2O

141. Along a period the atomic radii

Decreases

Increases

Constant

First decreases then increases

142. Which of the following has maximum e/m value for positive rays?

Hydrogen

Oxygen

Helium

Nitrogen

143. Bohr’s model atom is contradicted by

Heisenberg’s uncertainty principle

Quarternization of energy of electrons

Plank’s quantum theory

Quarternization of angular members

144. If the molecule of HCl were totally polar, the expected value of dipole moment is 6.12 D (Debye) but the experimental value of dipole moment was 1.03 D. Calculate the percentage ionic character.

Zero

145. The twelve enter most electrons in O₂ molecule are distributed according to MOT as under. Find the correct one.

12 in bonding molecular orbitals, and zero in anti-bonding molecular orbitals

8 in bonding molecular orbitals, 4 in anti-bonding molecular orbitals

10 in bonding molecular orbitals and 2 in anti-bonding molecular orbitals

9 in bonding molecular orbitals and 3 in anti-bonding molecular orbitals

146. The boiling point of heavy water is

99°C

110°C

101.4°C

108°C

147. What happens to IP value if shielding effect is greater?

Greater

No effect

Lesser

Remain same

148. Which of the following statements about positive ions is incorrect?

They are larger than the atoms from which they were formed

They are smaller than the atoms from which they were formed

They are also known as cations

They are formed when electros are formed from atoms

149. Which of the following is the correct electron – dot formula of CO₂?

150. Which is not true with respect to cathode rays?

A stream of electrons

Can be deflected by magnetic fields

Move with speed as that of light

Charged particles

Page 7 of 8

151. The most suitable method of the separation of a mixture of ortho and para-nitrophenol mixed in the ratio of 1 : 1 is

Colour spectrum

Crystallization

Vaporization

Distillation

152. 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?

153. Lewis acids are

Electron rich

Electron deficient

Octet is complete

No such acids exist

154. Which of the following geometry is associated with the compound in which the central atom assumes sp³ d hybridization?

Pyramidal

Planar

Trigonal bipyramidal

Angular

155. Geometry of molecule will be pyramidal if the outer post shell of the central atom has

1 bond pair 3 lone pair

3 bond pair one lone pair

2 bond pair 2 lone pair

3 lone pair 1 bond pair

156. The electro negativities of F, Cl, Br and I are 4.0, 3.0, 2.8, 2.5 respectively. Hydrogen halide with a high percentage of ionic character is

HCl

HBr

157. Hydrogen chloride molecule contains

Co-ordinate bond

Double bond

Electrovalent bond

Covalent bond

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

Iron

Nickel

Copper

Chromium

159. The ionization energy

Does not change in a period

Generally increases from left to right in a period

Does not change in a group

Increase from top to bottom in a group

160. Keeping in view the bonding molecular orbitals, find the incorrect statement

Bonding molecular orbitals are formed when the electrons waves are undergo constructive interference

Bonding molecular orbitals have low electron density between the two nuclei

Every electron in the bonding molecular orbital contributes to the attraction between atoms

Bonding molecular possess less energy than atomic orbitals from which they are formed

161. Geometry of simple molecule having SP³ hybrid orbital is

Linear

Tetrahedral

Square planner

Triangular

162. Which of the following phenomena will occur when two atoms of the elements having same spin of electron approach for bonding?

Bonding will not occur

Orbital overlap will not occur

None of these

Both A and B are correct

163. Which of the solid does not contain covalent bond

Copper

Graphite

Diamond

Ice

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

Se, Te

In, Pt

As, Sb

Ge, Sn

165. Colour of the glow produced in the discharge tube

Does not depend on the nature of the gas used in the discharge tube

Depends on the gas used in the discharge tube

Depends on the pressure in the discharge tube

166. The shape of H₃O⁺ is

Triangular planar

Pyramidal

Angular

Tetrahedral

167. Which of the following will have highest value of electron affinity

168. Which of the following compounds can form hydrogen bond?

NaCl

H₂O

CHCl₃

CH₄

169. Which carbon is more electronegative?

always same irrespective of its hybrid state

sp²- hybridized carbon

sp- hybridized carbon

sp³-hybridized carbon

170. With increasing principle quantum number, the energy difference between adjacent energy levels in H atom

Remains constant

Decreases for low value of Z and increases for higher value of Z

Increases

Decreases

171. H-bonding is not present in

Hydrogen fluoride

Hydrogen sulphide

Glycerine

Water

172. Energy released or absorbed when electrons are added in atom is

Electronegativity

Ionization potential

Electron affinity

Activation energy

173. By combining n atomic orbital, numbers of hybrid orbitals will be

3 n

Impossible to predict

2 n

174. In CCl₄, the four valencies of carbon are directed towards the corners of a

Cube

Tetrahedron

Hexagon

Prism

175. 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

16 and 5

16 and 4

12 and 4

12 and 5

Page 8 of 8

176. According to VSEPR theory, the shape of the water molecule is

Distorted tetrahedral

Linear

Planar triangle

Octahedral

177. Which of these molecules require more bond energy?

Oxygen

Hydrogen

Nitrogen

178. An oxygen atom has mass of

16g

5.316 x 10¯²³ g

2.657 x 10¯²³ g

5.316 x 10¯²³ g

179. The force which holds the atoms together to form a compound is known as

Van der Waal’s force

London force

Chemical bond

Dispersion force

180. In OF₂, number of bond pairs and lone pairs of electrons are respectively

2, 8

2, 10

2, 9

2, 6

181. The value of e/m ratio of electron is:

6.02 x 10²³

9.1095 x 10¯³¹

1.7588 x 10¹¹

1.7588 x 10²⁰

182. Molecular orbital picture of N₂ indicates

One unpaired electron

No unpaired electron

Two unpaired electron

None of these

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Malik TahirLast Updated: May 24, 2025

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