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Chemistry Chemical Bonding Online Mcqs Test

Malik TahirLast Updated: October 14, 2025

Start your preparation for Chemistry Chemical Bonding Online Mcqs Test. This online test contains important MCQs from past papers. Attempting this test will help you prepare for Annual Exams and Entry Tests. Read the questions carefully and select the correct option below to see your result.

Important Chemistry Chemical Bonding Question and Answer

Total Questions:	187
Time Allowed:	60 Minutes
Total Marks:	187
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Page 1 of 8

Chemistry

1. Bond order for N2 molecule is

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

Electron

Neutron

All these

Proton

3. Number of π-bonds in naphthalene is

4. Hydrogen chloride molecule contains

Co-ordinate bond

Electrovalent bond

Covalent bond

Double bond

5. Fluorine molecule is formed by

The axial s-p overlap

The overlap of two sp² hybrid orbitals

The sidewise p-p overlap

The axial p-p overlap

6. Electronic configuration of K is

[Kr]4S¹

[AR]4S¹

[AR]4S²

[He]4S¹

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

4, 4, 0, ½

4, 1, 1, ½

4, 0, 0, ½

4, 1, 0, ½

8. 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?

-2.96

-1.11

-1.48

-2.22

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

10. Unit of dipole moment is

Newton

Poise

Pascal

Debye

11. Maximum hydrogen bonds in water are,

12. 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……

p orbitals

s orbitals

sp³ hybrid orbitals

sp² hybrid orbitals

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

5….0

0….5

1….5

5….1

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

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

HBr

HCl

16. Bohr’s model atom is contradicted by

Quarternization of energy of electrons

Heisenberg’s uncertainty principle

Plank’s quantum theory

Quarternization of angular members

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

3, 2, 1

3, 1, 1

2, 1, 1

2, 1, 0

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

CH₄

NH₄Cl

H₂O₂

HCN

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

Three sigma bonds

One sigma bond and two pi-bonds

Two sigma bonds and one pi-bond

Three pi-bonds

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

6.63 x 10¯³⁴ m

6.63 x 10¯³⁵ m

6.65 x 10¯³⁵ m

6.63 x 10¯³³ m

21. Which molecule is polar among the following?

Carbon tetrachloride

Ethane

Methanol

Carbon dioxide

22. Along a period the atomic radii

Constant

First decreases then increases

Decreases

Increases

23. 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

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

Dipole-dipole interaction

H-bonding

Dispersion force

Ion-dipole interaction

25. H-bonding is not present in

Glycerine

Water

Hydrogen sulphide

Hydrogen fluoride

Page 2 of 8

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

Both are equal

Cannot be determined

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

BF₃

H₂O

BrF₃

NH₃

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

H₂O

H₂S3

H₂Te

H₂O

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

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

3 and 5

3 and 9

2 and 5

3 and 7

31. Which of the solid does not contain covalent bond

Diamond

Graphite

Ice

Copper

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

NH₃

H₂O

CH₄

BH₃

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

He⁺

Li⁺

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

3 bond pair one lone pair

2 bond pair 2 lone pair

3 lone pair 1 bond pair

1 bond pair 3 lone pair

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

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

60°

120°

109°

90°

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

Chromium

Nickel

Iron

Copper

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

All of above represent same entity

Bond

Interaction

Attractive force

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

4 electrons

6 electrons

1 electron

2 electrons

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

HCl

H₂O

CCl₄

CH₃Cl

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

Square planner

Triangular

Trigonal bipyramidal

Octahedral

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

SP²

43. Inter molecular forces in solid hydrogen are

Van der Waal forces or London dispersion forces

Covalent forces

All of these

Hydrogen bonds

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

H – SH

H – OH

H – Cl

H – NH₂

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

Nine σ and nine π

Five π and nine σ

Eight σ and eight π

Nine σ and seven π

46. ____________ has their outermost shell complete in atomic form

Noble gases

Coinage metals

Alkali metals

Gun metals

47. 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?

48. The nature of positive rays depends upon

The nature of residual gas

All of these

The nature of discharge tube

The nature of electrode

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

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

Angular

Pyramidal

Planar

Trigonal bipyramidal

Page 3 of 8

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

He⁺

Li⁺

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

53. 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 pressure in the discharge tube

Depends on the gas used in the discharge tube

54. Nuclear radiation is emitted by those elements whose

Nuclei are stable

Molecules are stable

Molecules are unstable

Nuclei are unstable

55. The number of significant figures in 0.00200 is

One

Five

Three

Two

56. Which of the following has zero depolemoment?

CFCl₃

ClF

SiF₄

PCl₃

57. When potassium metal is exposed to violet light

Ejection of electrons takes place

Ejection of some potassium atoms occurs

There is no effect

The absorption of electrons takes place

58. In O2 each oxygen atom is hybridized

All

Sp2

Sp3

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

PCl₃

Pcl₄

CH₄

N⁺H₄

60. The structure of ICl₂¯ is

Trigonal

Trigonal bipyramidal

Octahedral

Square planar

61. Molecular orbitals are filled according to

Aufbau principal

Pauli’s exclusion principle

All these

Hund’s rule

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

Hexagon

Cube

Tetrahedron

Prism

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

Electronegativity

None of these

Electron affinity

Ionization energy

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

SF₄

BF₃

XeF₄

SiF₄

65. Geometry of simple molecule having sp3 hybrid orbital is

Square planner

Linear

Tetrahedral

Triangular

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

Electro negativity

Electron affinity

Ionization energy

None of these

67. 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

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

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

70. Which of the following molecule has Ā bond

O₂

NH₃

C₃H₆

H₂O

71. 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

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

Se, Te

Ge, Sn

As, Sb

In, Pt

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

They energy of atoms increases

The repulsive force dominate the attractive forces

The two atoms start ionization

The attractive forces dominate the repulsive forces

74. Deflection of blue light is lesser than violet because

Blue is absorbed more easily

Blue is darker colour

Blue has more energy

Blue has higher wavelength

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

Ionization potential

Electronegativity

Electron affinity

Activation energy

Page 4 of 8

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

Helium

Oxygen

Nitrogen

Hydrogen

77. Covalent compounds are soluble in

Polar solvents

Non-polar solvents

All solvents

Concentrated acids

78. Molecular orbital picture of N₂ indicates

None of these

No unpaired electron

One unpaired electron

Two unpaired electron

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

CH₄

H₂O

NaCl

CHCl₃

80. Geometry of simple molecule having SP³ hybrid orbital is

Square planner

Triangular

Tetrahedral

Linear

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

Excited state of neon

Excited state of O¯₂

Excited state of fluorine

Ground state of fluorine atom

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

SP²

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

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

Equal to 1.7

No specificity exist

Lesser then 1.7

Greater than 1.7

85. XeF₄ has shape of

Square planar

Tetrahedral

Trigonal bipyramidal

Sphere

86. The boiling point of heavy water is

99°C

110°C

108°C

101.4°C

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

88. 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

Hydrogen bond formation

Van der Waal’s forces

Dipole interaction

89. 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

Fifth Bohr orbit to the second Bohr orbit

Sixth Bohr orbit to the third Bohr orbit

Seventh Bohr orbit to the third Bohr orbit

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

Gamma rays

Larger wavelength

Shorter wavelength

X-rays not produced

91. The shape of H₃O⁺ is

Triangular planar

Tetrahedral

Angular

Pyramidal

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

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

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

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

Hydrogen bonds only

Ionic and nonpolar hydrogen bonds

Both polar covalent and hydrogen bonds

Nonpolar covalent bonds only

94. The carbon atoms in calcium carbide are held by

2 sigma bonds

Ionic bonds

2π and one σ bond

2 covalent, one co-ordinate bond

95. On sp3 hybridization

Four p-orbitals are involved

One p-orbital is involved

One s and 3 p-orbitals are involved

All p-orbitals are involved

96. Which one of these is weakest?

Ionic bond

Covalent bond

Van der Waal’s forces

Metallic bond

97. Which carbon is more electronegative?

always same irrespective of its hybrid state

sp²- hybridized carbon

sp- hybridized carbon

sp³-hybridized carbon

98. Anti-bonding MO is formed by

None of these

Subtraction of atomic orbitals

Addition of atomic orbitals

Multiplication of atomic orbitals

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

Pyramidal

Triangular

Tetrahedral

Trigonal

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

Calcium

Page 5 of 8

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

Low ionization energy of sodium

Photosensitivity of sodium

Sublimation of metallic sodium to give yellow vapour

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

102. Number of sigma bonds in P₄O₁₀ is

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

N₂

SO₂

PCl₅

He₂

104. Unit of dipole moment is

Newton

Debye

Poise

Pascal

105. Which has the minimum bond angle?

CH₄

H₂S

H₂O

NH₃

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

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

Decreases

Remains constant

Increases

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

Liquid NH3

Phenol

Water

Liquid HCl

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

X – radiation, visible, infrared, microwave

Microwave, infrared, visible, ultraviolet

Radio, visible, infrared, ultraviolet

Visible, ultraviolet, infrared, gamma rays

109. Lateral overlapping expected in

Ā-bonds

O-bond

Metallic bond

Ionic bond

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

Diamagnetic character

Bond order of 2.5

Three unpaired electrons

Stability lower then O₂

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

SiCl₄

NaCl

AlCl₃

MgCl₂

112. Pick out the molecule which has zero dipole moment

SO₂

BCl₃

NH₃

H₂O

113. Energy of an atom in a compound is

Lesser than individual

Impossible to predict

No change

Higher than individual

114. 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 equal to that in NO

Bond length in NO⁺ is greater than in NO

Bond length in NO is greater than in NO⁺

Bond length is unpredictable

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

One sigma, one pi

Two sigma, one pi

Two sigma, two pi

One sigma, two pi

116. Which of the following has unchanged valency?

Oxygen

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

Bond pair – bond pair repulsion only

Lone pair – lone pair repulsion only

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

Lone pair – bond pair repulsion only

118. 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

0.656 nm

656 nm

65.6 nm

6.56 nm

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

Linear

Distorted tetrahedral

Octahedral

Planar triangle

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

3 x ɜ₀

1/2 x ɜ₀

6 x ɜ₀

9 x ɜ₀

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

122. Effective magnetic moment of Sc³ ion is

2.83

1.73

5.92

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

X₂Y

X₂Y₃

XY₂

124. Quantum umber values for 2p orbitals are

n = 1, l = 0

n = 2, l = 0

n = 1, l = 2

n = 2, l = 1

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

Increases

Decreases

Constant

Variable trend

Page 6 of 8

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

They are formed when electros are formed from atoms

They are also known as cations

They are larger than the atoms from which they were formed

They are smaller than the atoms from which they were formed

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

-54.4 eV

-13.6 eV

-5.44 eV

Zero

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

Vaporization

Crystallization

Colour spectrum

Distillation

129. The ionization energy

Increase from top to bottom in a group

Does not change in a group

Does not change in a period

Generally increases from left to right in a period

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

First increases then decreases

First decreases then increases

Decreases

Increases

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

1.7588 x 10²⁰

9.1095 x 10¯³¹

6.02 x 10²³

1.7588 x 10¹¹

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

Pyramidal

Planar triangle

Square planar

Tetrahedral

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

134. Al become isoelectronic with Ne

By gaining two electrons

By losing two electrons

By losing three electrons

By gaining three electrons

135. Bond angle in water is

109.5°

104.5°

107°

120°

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

Cu⁺

Ni³⁺

Zn⁺

Fe²⁺

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

HCl

HBr

H₂O

138. A lone pair of electrons in an atom implies

A pair of electrons

A pair of electrons involved in bonding

A pair of valence electrons

A pair of valence electrons not involved in bonding

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

HBr

H2O

HCI

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

141. Which of these molecules require more bond energy?

Oxygen

Hydrogen

Nitrogen

142. Ionic radius in a period from left to right

First increases then decreases

First decreases then increases

Increases

Decreases

143. 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⁺

Cu²⁺

Ni²⁺

144. The shape of the molecule SF₂Cl₂ is

Trigonal bipyramidal

Cubic

Octahedral

Tetrahedral

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

109.5

102

104.5

107.5

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

None of these

Electro negativity

Ionization energy

Electron affinity

147. 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

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

High, very negative

Low, positive or slightly negative

Low very negative

None of these

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

Impossible to predict

3 n

2 n

150. Which of the following species is paramagnetic?

O²¯

CN¯

CO₂

Page 7 of 8

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

Water should be preferred over lemon Juice for drinking

There may not be a possibility of chemical reaction

There may be a possibility of a chemical reaction

Lemon juice is dangerous for health

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

Dipole moment is zero

SP hybridization

Linear geometry

None

153. The velocity of photon is

Depends on its source

Equal to square

Depends on its wavelength

Independent of its wavelength

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

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

156. Choose the correct statement

Each bonding molecular orbital can accommodate only one electron

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

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

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

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

C and F

N and F

O and F

Na and F

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

I.P

Ea.

E.A

E.N

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

They have completely filled s and p orbitals

They do not react with one another

They are mono atomic gases

They have high ionization energies

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

Move with speed as that of light

Can be deflected by magnetic fields

Charged particles

A stream of electrons

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

3.0 BM

5.9 BM

6.9 BM

4.9 BM

162. 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

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

Lesser

Greater

No effect

Remain same

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

Water molecules associate through hydrogen bonding

Sulphure has high electronegativity than oxygen

Water has higher molecular weight

Hydrogen sulphide is a weak acid

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

K⁺

Cl¯

S¯²

Na⁺

166. 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

167. Lewis acids are

No such acids exist

Octet is complete

Electron rich

Electron deficient

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

2, 6

2, 10

2, 8

2, 9

169. 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

170. Shape of CIO₃¯ is

Tetrahedral

Triangular planar

Triangular bipyramidal

Triangular pyramidal

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

10, 3

3, 10

9, 4

4, 9

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

Electropositive character of elements

Electronegative character of elements

Pauli exclusion principle

Octet rule

173. 2nd orbit is away from nucleus for H-atom as compared to first orbit

2-times

3-times

4-times

6-times

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

Electron affinity

Atomic size

Electronegativity

Ionization energy

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

Chemical bond

Dispersion force

Van der Waal’s force

London force

Page 8 of 8

176. 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

Boron trifluoride is pyramidal in shape while NH₃ is planar

Fluorides is more electronegative

177. 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 4

12 and 5

16 and 5

12 and 4

178. An oxygen atom has mass of

16g

2.657 x 10¯²³ g

5.316 x 10¯²³ g

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

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?

10.23

10.2340178

10.234

10.234017

181. Pi bonds are produced by overlapping of

Un-hybrid orbitals

Atomic orbital and hybrid orbital

Hybrid orbitals

Hybrid and un hybrid orbitals

182. Which of the following is not isoelectronic?

Mg²⁺

O²¯

Na⁺

Cl¯

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