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

1.7588 x 10²⁰

1.7588 x 10¹¹

6.02 x 10²³

9.1095 x 10¯³¹

2. 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?

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

Nonpolar covalent bonds only

Both polar covalent and hydrogen bonds

Ionic and nonpolar hydrogen bonds

Hydrogen bonds only

4. 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⁺

5. The velocity of photon is

Equal to square

Independent of its wavelength

Depends on its wavelength

Depends on its source

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

Electropositive character of elements

Octet rule

Pauli exclusion principle

Electronegative character of elements

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

Li⁺

He⁺

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

CH₄

NH₄Cl

HCN

H₂O₂

9. Which of the solid does not contain covalent bond

Graphite

Ice

Copper

Diamond

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

Ion-dipole interaction

Dispersion force

Dipole-dipole interaction

H-bonding

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

Two sigma bonds and one pi-bond

Three sigma bonds

Three pi-bonds

One sigma bond and two pi-bonds

12. A lone pair of electrons in an atom implies

A pair of valence electrons not involved in bonding

A pair of electrons

A pair of electrons involved in bonding

A pair of valence electrons

13. 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

Distillation

Vaporization

14. Along a period the atomic radii

Constant

Increases

First decreases then increases

Decreases

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

They have high ionization energies

They do not react with one another

They have completely filled s and p orbitals

They are mono atomic gases

16. Which of the following has unchanged valency?

Oxygen

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

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

19. 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

HBr

HCl

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

21. H-bonding is not present in

Hydrogen fluoride

Hydrogen sulphide

Water

Glycerine

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

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

Greater than 1.7

No specificity exist

Equal to 1.7

Lesser then 1.7

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

One sigma, one pi

Two sigma, two pi

One sigma, two pi

Two sigma, one pi

25. 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 in NO is greater than in NO⁺

Bond length in NO⁺ is greater than in NO

Bond length in NO⁺ is equal to that in NO

Bond length is unpredictable

Page 2 of 8

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

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

Larger wavelength

X-rays not produced

Shorter wavelength

Gamma rays

28. Colour of the glow produced in the discharge tube

Depends on the gas used in the discharge tube

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

Depends on the pressure in the discharge tube

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

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

Radio, visible, infrared, ultraviolet

Microwave, infrared, visible, ultraviolet

Visible, ultraviolet, infrared, gamma rays

X – radiation, visible, infrared, microwave

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

Diamagnetic character

Bond order of 2.5

Stability lower then O₂

Three unpaired electrons

31. Which molecule is polar among the following?

Methanol

Ethane

Carbon dioxide

Carbon tetrachloride

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

Nine σ and nine π

Eight σ and eight π

Five π and nine σ

Nine σ and seven π

33. When potassium metal is exposed to violet light

The absorption of electrons takes place

Ejection of some potassium atoms occurs

There is no effect

Ejection of electrons takes place

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

Planar triangle

Distorted tetrahedral

Linear

Octahedral

35. 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

12 and 4

12 and 5

16 and 4

36. Choose the correct statement about 2nd ionization energy

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

It is always greater than 1st ionization energy

It is equal to the 1st ionization energy

It is always less than 1st ionization energy

37. 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?

-1.11

-2.22

-2.96

-1.48

38. 1 erg of energy corresponds to

1 erg/mol

6.02 x 10¹⁶ J/mol

10¯⁷ J/mol

6.02 x 10²³ J/mol

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

Phenol

Liquid HCl

Liquid NH3

Water

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

SP²

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

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

Both are equal

Cannot be determined

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

None of these

Ionization energy

Electronegativity

Electron affinity

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

Tetrahedral

Square planar

Pyramidal

Planar triangle

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

Helium

Hydrogen

Nitrogen

Oxygen

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

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

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

Low very negative

Low, positive or slightly negative

None of these

High, very negative

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

Cu⁺

Zn⁺

Fe²⁺

Ni³⁺

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

N and F

C and F

Na and F

O and F

Page 3 of 8

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

There may not be a possibility of chemical reaction

Lemon juice is dangerous for health

There may be a possibility of a chemical reaction

Water should be preferred over lemon Juice for drinking

52. 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

109.5

102

104.5

53. Inter molecular forces in solid hydrogen are

Hydrogen bonds

Van der Waal forces or London dispersion forces

Covalent forces

All of these

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

Angular

Planar

Trigonal bipyramidal

Pyramidal

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

-13.6 eV

-54.4 eV

Zero

-5.44 eV

56. The shape of H₃O⁺ is

Angular

Triangular planar

Pyramidal

Tetrahedral

57. Covalent compounds are soluble in

Concentrated acids

Polar solvents

All solvents

Non-polar solvents

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

H – OH

H – NH₂

H – Cl

H – SH

59. Electronic configuration of K is

[He]4S¹

[AR]4S²

[AR]4S¹

[Kr]4S¹

60. 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

61. The ionization energy

Does not change in a period

Increase from top to bottom in a group

Does not change in a group

Generally increases from left to right in a period

62. Which of these molecules require more bond energy?

Hydrogen

Nitrogen

Oxygen

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

3 and 7

3 and 9

3 and 5

2 and 5

64. The carbon atoms in calcium carbide are held by

Ionic bonds

2 covalent, one co-ordinate bond

2π and one σ bond

2 sigma bonds

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

Lesser

Greater

No effect

Remain same

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

Water has higher molecular weight

Sulphure has high electronegativity than oxygen

Hydrogen sulphide is a weak acid

Water molecules associate through hydrogen bonding

67. Unit of dipole moment is

Newton

Debye

Pascal

Poise

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

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

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

It has high heat of dissociation

It has high electronegativity

69. Choose the correct statement

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

Each bonding molecular orbital can accommodate only one electron

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

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

Calcium

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

H₂O

CH₃Cl

HCl

CCl₄

72. Quantum umber values for 2p orbitals are

n = 2, l = 0

n = 1, l = 0

n = 1, l = 2

n = 2, l = 1

73. 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¯³³ m

6.63 x 10¯³⁴ m

6.65 x 10¯³⁵ m

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

Cube

Hexagon

Prism

Tetrahedron

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

Page 4 of 8

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

4, 9

10, 3

3, 10

9, 4

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

6 electrons

1 electron

4 electrons

2 electrons

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

N⁺H₄

Pcl₄

PCl₃

CH₄

79. Bond order for N2 molecule is

80. An oxygen atom has mass of

16g

2.657 x 10¯²³ g

5.316 x 10¯²³ g

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

Chemical bond

London force

Dispersion force

Van der Waal’s force

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

Trigonal

Pyramidal

Tetrahedral

Triangular

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

Ground state of fluorine atom

Excited state of O¯₂

Excited state of fluorine

Excited state of neon

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

All of above represent same entity

Attractive force

Bond

Interaction

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

Electron affinity

Ionization energy

Electronegativity

Atomic size

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

E.N

E.A

Ea.

I.P

87. The shape of the molecule SF₂Cl₂ is

Tetrahedral

Cubic

Octahedral

Trigonal bipyramidal

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

2, 8

2, 6

2, 9

2, 10

89. Number of π-bonds in naphthalene is

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

Remains constant

Increases

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

Decreases

91. Ionic radius in a period from left to right

Increases

First decreases then increases

First increases then decreases

Decreases

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

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

94. Which carbon is more electronegative?

sp²- hybridized carbon

sp- hybridized carbon

always same irrespective of its hybrid state

sp³-hybridized carbon

95. The nature of positive rays depends upon

The nature of electrode

The nature of discharge tube

The nature of residual gas

All of these

96. Geometry of simple molecule having sp3 hybrid orbital is

Tetrahedral

Triangular

Square planner

Linear

97. Al become isoelectronic with Ne

By losing two electrons

By gaining three electrons

By gaining two electrons

By losing three electrons

98. Which of the following molecule has Ā bond

C₃H₆

H₂O

NH₃

O₂

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

HBr

HCl

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

SiF₄

SF₄

XeF₄

BF₃

Page 5 of 8

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

Electron

Neutron

Proton

All these

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

None

SP hybridization

Dipole moment is zero

Linear geometry

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

NaCl

H₂O

CHCl₃

CH₄

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

105. Molecular orbital picture of N₂ indicates

None of these

No unpaired electron

Two unpaired electron

One unpaired electron

106. 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?

Covalent attraction

Van der Waal’s forces

Dipole interaction

Hydrogen bond formation

107. Anti-bonding MO is formed by

None of these

Subtraction of atomic orbitals

Multiplication of atomic orbitals

Addition of atomic orbitals

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

BF₃

H₂O

NH₃

BrF₃

109. Fluorine molecule is formed by

The overlap of two sp² hybrid orbitals

The axial p-p overlap

The axial s-p overlap

The sidewise p-p overlap

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

3 n

Impossible to predict

2 n

111. Geometry of simple molecule having SP³ hybrid orbital is

Square planner

Linear

Triangular

Tetrahedral

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

The two atoms start ionization

The attractive forces dominate the repulsive forces

They energy of atoms increases

The repulsive force dominate the attractive forces

113. Unit of dipole moment is

Poise

Newton

Debye

Pascal

114. Deflection of blue light is lesser than violet because

Blue has higher wavelength

Blue has more energy

Blue is darker colour

Blue is absorbed more easily

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

Boron trifluoride is pyramidal in shape while NH₃ is planar

NH₃ is pyramidal in shape while BF₃ is planar

Fluorides is more electronegative

Fluorides are more electronegative

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

SP²

117. Molecular orbitals are filled according to

Pauli’s exclusion principle

All these

Hund’s rule

Aufbau principal

118. Which of the following is not isoelectronic?

O²¯

Mg²⁺

Na⁺

Cl¯

119. Energy of an atom in a compound is

Lesser than individual

No change

Higher than individual

Impossible to predict

120. 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

s orbitals

sp³ hybrid orbitals

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

HCI

HBr

H2O

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

123. Lateral overlapping expected in

Ā-bonds

O-bond

Metallic bond

Ionic bond

124. Bohr’s model atom is contradicted by

Heisenberg’s uncertainty principle

Quarternization of angular members

Plank’s quantum theory

Quarternization of energy of electrons

125. The structure of ICl₂¯ is

Trigonal bipyramidal

Octahedral

Square planar

Trigonal

Page 6 of 8

126. 2nd orbit is away from nucleus for H-atom as compared to first orbit

4-times

6-times

2-times

3-times

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

Li⁺

He⁺

128. Effective magnetic moment of Sc³ ion is

2.83

5.92

1.73

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

5….1

0….5

5….0

1….5

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

Trigonal bipyramidal

Square planner

Octahedral

Triangular

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

H₂O

BH₃

CH₄

NH₃

132. Lewis acids are

Octet is complete

Electron deficient

Electron rich

No such acids exist

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

S¯²

Cl¯

K⁺

Na⁺

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

None of these

Ionization energy

Electron affinity

Electro negativity

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

Bonding molecular orbitals have low electron density between the two nuclei

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

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

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

136. Pi bonds are produced by overlapping of

Hybrid orbitals

Un-hybrid orbitals

Hybrid and un hybrid orbitals

Atomic orbital and hybrid orbital

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

Activation energy

Electron affinity

Electronegativity

Ionization potential

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

Lone pair – bond pair repulsion only

Bond pair – bond pair repulsion only

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

Lone pair – lone pair repulsion only

139. The number of significant figures in 0.00200 is

Two

Five

Three

One

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

141. Which of the following has zero depolemoment?

CFCl₃

PCl₃

ClF

SiF₄

142. Nuclear radiation is emitted by those elements whose

Molecules are stable

Nuclei are unstable

Molecules are unstable

Nuclei are stable

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

HBr

HCl

H₂O

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

60°

109°

120°

90°

145. Bond angle in water is

107°

120°

109.5°

104.5°

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

Photosensitivity of sodium

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

Low ionization energy of sodium

Sublimation of metallic sodium to give yellow vapour

147. Which has the minimum bond angle?

CH₄

H₂O

H₂S

NH₃

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

149. Which of the following species is paramagnetic?

CN¯

CO₂

O²¯

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

SiCl₄

AlCl₃

NaCl

MgCl₂

Page 7 of 8

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

4, 0, 0, ½

4, 4, 0, ½

4, 1, 1, ½

4, 1, 0, ½

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

SO₂

PCl₅

He₂

N₂

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

Decreases

Constant

Increases

Variable trend

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

They are formed when electros are formed from atoms

They are larger than the atoms from which they were formed

They are also known as cations

They are smaller than the atoms from which they were formed

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

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

Se, Te

In, Pt

Ge, Sn

As, Sb

157. 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

158. 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

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

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

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

159. 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

0.656 nm

656 nm

6.56 nm

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

First increases then decreases

Increases

First decreases then increases

Decreases

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

3 lone pair 1 bond pair

3 bond pair one lone pair

1 bond pair 3 lone pair

2 bond pair 2 lone pair

162. 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

163. Hydrogen chloride molecule contains

Covalent bond

Co-ordinate bond

Double bond

Electrovalent bond

164. Number of sigma bonds in P₄O₁₀ is

165. 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

Sixth Bohr orbit to the third Bohr orbit

Seventh Bohr orbit to the third Bohr orbit

Fifth Bohr orbit to the second Bohr orbit

166. Pick out the molecule which has zero dipole moment

NH₃

SO₂

H₂O

BCl₃

167. The boiling point of heavy water is

110°C

108°C

99°C

101.4°C

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

Nickel

Chromium

Copper

Iron

169. Shape of CIO₃¯ is

Triangular bipyramidal

Tetrahedral

Triangular planar

Triangular pyramidal

170. ____________ has their outermost shell complete in atomic form

Coinage metals

Alkali metals

Noble gases

Gun metals

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

2, 1, 0

3, 1, 1

3, 2, 1

2, 1, 1

172. Maximum hydrogen bonds in water are,

173. XeF₄ has shape of

Sphere

Trigonal bipyramidal

Tetrahedral

Square planar

174. In O2 each oxygen atom is hybridized

Sp3

Sp2

All

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

6 x ɜ₀

3 x ɜ₀

1/2 x ɜ₀

9 x ɜ₀

Page 8 of 8

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

Ionization energy

None of these

Electro negativity

Electron affinity

177. On sp3 hybridization

All p-orbitals are involved

Four p-orbitals are involved

One s and 3 p-orbitals are involved

One p-orbital is involved

178. 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

179. Which one of these is weakest?

Ionic bond

Van der Waal’s forces

Metallic bond

Covalent bond

180. 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

10.23

10.234

10.2340178

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

H₂O

H₂S3

H₂Te

H₂O

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

Both A and B are correct

Orbital overlap will not occur

None of these

Bonding will not occur

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Malik TahirLast Updated: May 24, 2025

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Chemistry Chemical Bonding MCQS Online Test

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