Chemistry Chemical Bonding Online Mcqs Test

Malik TahirLast Updated: October 14, 2025

Important Chemistry Chemical Bonding Question and Answer

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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Chemistry Chemical Bonding Practice Test Online With Explanation

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Page 1 of 8

Chemistry

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

Cannot be determined

Both are equal

2. Number of π-bonds in naphthalene is

3. Which of the following species is paramagnetic?

CO₂

CN¯

O²¯

4. 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

5. Pick out the molecule which has zero dipole moment

NH₃

BCl₃

SO₂

H₂O

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

7. Hydrogen chloride molecule contains

Electrovalent bond

Covalent bond

Co-ordinate bond

Double bond

8. 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

9. 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

10. Quantum umber values for 2p orbitals are

n = 1, l = 0

n = 1, l = 2

n = 2, l = 1

n = 2, l = 0

11. The shape of the molecule SF₂Cl₂ is

Tetrahedral

Octahedral

Trigonal bipyramidal

Cubic

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

13. Maximum hydrogen bonds in water are,

14. Which has the minimum bond angle?

H₂S

NH₃

CH₄

H₂O

15. Lateral overlapping expected in

Metallic bond

Ā-bonds

O-bond

Ionic bond

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

2, 6

2, 10

2, 8

2, 9

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

-54.4 eV

-13.6 eV

-5.44 eV

Zero

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

Distorted tetrahedral

Octahedral

Planar triangle

Linear

19. 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

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

Chromium

Iron

Copper

Nickel

21. The shape of H₃O⁺ is

Angular

Pyramidal

Triangular planar

Tetrahedral

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

23. Bond order for N2 molecule is

24. Number of sigma bonds in P₄O₁₀ is

25. 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

sp³ hybrid orbitals

s orbitals

sp² hybrid orbitals

Page 2 of 8

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

Cube

Hexagon

Tetrahedron

Prism

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

Boron trifluoride is pyramidal in shape while NH₃ is planar

Fluorides is more electronegative

NH₃ is pyramidal in shape while BF₃ is planar

Fluorides are more electronegative

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

First decreases then increases

First increases then decreases

Decreases

Increases

29. 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

Vaporization

Distillation

Crystallization

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

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

Lone pair – lone pair repulsion only

Bond pair – bond pair repulsion only

Lone pair – bond pair repulsion only

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

32. Deflection of blue light is lesser than violet because

Blue is absorbed more easily

Blue has higher wavelength

Blue is darker colour

Blue has more energy

33. The nature of positive rays depends upon

The nature of discharge tube

All of these

The nature of electrode

The nature of residual gas

34. Which one of these is weakest?

Van der Waal’s forces

Metallic bond

Covalent bond

Ionic bond

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

One sigma, one pi

One sigma, two pi

Two sigma, one pi

Two sigma, two pi

36. H-bonding is not present in

Water

Glycerine

Hydrogen fluoride

Hydrogen sulphide

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

Diamagnetic character

Three unpaired electrons

Bond order of 2.5

Stability lower then O₂

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

The repulsive force dominate the attractive forces

The two atoms start ionization

They energy of atoms increases

The attractive forces dominate the repulsive forces

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

0….5

1….5

5….0

5….1

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

9, 4

10, 3

3, 10

4, 9

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

Trigonal

Tetrahedral

Triangular

Pyramidal

42. Choose the correct statement about 2nd ionization energy

It is always greater than 1st ionization energy

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

It is always less than 1st ionization energy

It is equal to the 1st ionization energy

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

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

Seventh Bohr orbit to the third Bohr orbit

Sixth Bohr orbit to the third Bohr orbit

Fourth Bohr orbit to the first Bohr orbit

Fifth Bohr orbit to the second Bohr orbit

45. Electronic configuration of K is

[Kr]4S¹

[AR]4S¹

[He]4S¹

[AR]4S²

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

Larger wavelength

X-rays not produced

Gamma rays

Shorter wavelength

47. The number of significant figures in 0.00200 is

Two

Three

One

Five

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

Ionization energy

Electronegativity

Atomic size

Electron affinity

49. Which of the following has unchanged valency?

Oxygen

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

Page 3 of 8

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

Hydrogen sulphide is a weak acid

Sulphure has high electronegativity than oxygen

Water molecules associate through hydrogen bonding

Water has higher molecular weight

52. Which of the following is not isoelectronic?

Na⁺

O²¯

Mg²⁺

Cl¯

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

Calcium

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

HCl

CH₃Cl

CCl₄

H₂O

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

No specificity exist

Greater than 1.7

Lesser then 1.7

Equal to 1.7

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

HBr

H2O

HCI

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

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

CH₄

NH₄Cl

H₂O₂

HCN

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

Ionization energy

Electron affinity

None of these

Electro negativity

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

Ion-dipole interaction

Dipole-dipole interaction

H-bonding

Dispersion force

61. ____________ has their outermost shell complete in atomic form

Coinage metals

Alkali metals

Noble gases

Gun metals

62. Covalent compounds are soluble in

Concentrated acids

All solvents

Non-polar solvents

Polar solvents

63. Along a period the atomic radii

First decreases then increases

Constant

Increases

Decreases

64. 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

-2.96

-1.11

-1.48

65. 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

104.5

107.5

102

66. Geometry of simple molecule having sp3 hybrid orbital is

Triangular

Tetrahedral

Square planner

Linear

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

H₂O

NH₃

BH₃

CH₄

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

Cl¯

Na⁺

K⁺

S¯²

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

Pyramidal

Planar triangle

Square planar

Tetrahedral

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

Eight σ and eight π

Nine σ and nine π

Nine σ and seven π

Five π and nine σ

71. Bond angle in water is

109.5°

120°

104.5°

107°

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

They have high ionization energies

They have completely filled s and p orbitals

They are mono atomic gases

They do not react with one another

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

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

H – Cl

H – NH₂

H – OH

H – SH

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

There may be a possibility of a chemical reaction

Lemon juice is dangerous for health

Water should be preferred over lemon Juice for drinking

There may not be a possibility of chemical reaction

Page 4 of 8

76. Inter molecular forces in solid hydrogen are

Van der Waal forces or London dispersion forces

All of these

Covalent forces

Hydrogen bonds

77. Which of the following has zero depolemoment?

PCl₃

CFCl₃

ClF

SiF₄

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

3, 1, 1

2, 1, 1

2, 1, 0

3, 2, 1

79. Molecular orbitals are filled according to

All these

Aufbau principal

Pauli’s exclusion principle

Hund’s rule

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

H₂O

H₂S3

H₂O

H₂Te

81. 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

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

Each bonding molecular orbital can accommodate only one electron

82. Anti-bonding MO is formed by

Multiplication of atomic orbitals

Subtraction of atomic orbitals

None of these

Addition of atomic orbitals

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

Li⁺

He⁺

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

All these

Electron

Neutron

Proton

85. An oxygen atom has mass of

2.657 x 10¯²³ g

16g

5.316 x 10¯²³ g

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

Fe²⁺

Ni³⁺

Cu⁺

Zn⁺

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

6 x ɜ₀

9 x ɜ₀

3 x ɜ₀

1/2 x ɜ₀

88. 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

10.234

10.2340178

10.23

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

NaCl

H₂O

CH₄

CHCl₃

90. 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

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

Trigonal bipyramidal

Planar

Angular

Pyramidal

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

BrF₃

H₂O

BF₃

NH₃

93. Lewis acids are

Electron deficient

Octet is complete

Electron rich

No such acids exist

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

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

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

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

Remain same

No effect

Greater

Lesser

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

1.7588 x 10¹¹

6.02 x 10²³

9.1095 x 10¯³¹

1.7588 x 10²⁰

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

Ni²⁺

Cu⁺

Cu²⁺

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

Charged particles

Can be deflected by magnetic fields

Move with speed as that of light

A stream of electrons

Page 5 of 8

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

1 bond pair 3 lone pair

3 lone pair 1 bond pair

3 bond pair one lone pair

2 bond pair 2 lone pair

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

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

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

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

Bonding molecular orbitals have low electron density between the two nuclei

103. 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

104. 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

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

Depends on the pressure in the discharge tube

105. Unit of dipole moment is

Pascal

Poise

Newton

Debye

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

Trigonal bipyramidal

Square planner

Triangular

Octahedral

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

Excited state of O¯₂

Excited state of fluorine

Ground state of fluorine atom

Excited state of neon

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

Low, positive or slightly negative

High, very negative

None of these

Low very negative

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

Attractive force

Bond

Interaction

All of above represent same entity

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

In, Pt

As, Sb

Ge, Sn

Se, Te

111. 1 erg of energy corresponds to

6.02 x 10²³ J/mol

1 erg/mol

10¯⁷ J/mol

6.02 x 10¹⁶ J/mol

112. XeF₄ has shape of

Sphere

Trigonal bipyramidal

Square planar

Tetrahedral

113. Unit of dipole moment is

Debye

Poise

Pascal

Newton

114. Which of these molecules require more bond energy?

Nitrogen

Oxygen

Hydrogen

115. Which carbon is more electronegative?

sp- hybridized carbon

always same irrespective of its hybrid state

sp²- hybridized carbon

sp³-hybridized carbon

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

HBr

HCl

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

SP²

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

119. Shape of CIO₃¯ is

Triangular pyramidal

Triangular planar

Tetrahedral

Triangular bipyramidal

120. 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

121. 2nd orbit is away from nucleus for H-atom as compared to first orbit

3-times

4-times

2-times

6-times

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

2 n

Impossible to predict

3 n

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

Three sigma bonds

Three pi-bonds

Two sigma bonds and one pi-bond

One sigma bond and two pi-bonds

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

E.N

I.P

E.A

Ea.

125. On sp3 hybridization

One s and 3 p-orbitals are involved

All p-orbitals are involved

Four p-orbitals are involved

One p-orbital is involved

Page 6 of 8

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

None of these

Both A and B are correct

Orbital overlap will not occur

Bonding will not occur

127. Which of the following molecule has Ā bond

NH₃

O₂

C₃H₆

H₂O

128. The ionization energy

Does not change in a period

Increase from top to bottom in a group

Generally increases from left to right in a period

Does not change in a group

129. Al become isoelectronic with Ne

By gaining three electrons

By losing three electrons

By losing two electrons

By gaining two electrons

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

Visible, ultraviolet, infrared, gamma rays

Microwave, infrared, visible, ultraviolet

Radio, visible, infrared, ultraviolet

X – radiation, visible, infrared, microwave

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

Hydrogen

Oxygen

Nitrogen

Helium

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

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

Electropositive character of elements

Pauli exclusion principle

Electronegative character of elements

Octet rule

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

HBr

H₂O

HCl

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

Electron affinity

None of these

Ionization energy

Electro negativity

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

2 electrons

1 electron

6 electrons

4 electrons

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

109°

120°

90°

60°

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

4, 4, 0, ½

4, 0, 0, ½

4, 1, 0, ½

4, 1, 1, ½

139. 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

12 and 5

16 and 5

16 and 4

12 and 4

140. The structure of ICl₂¯ is

Trigonal bipyramidal

Trigonal

Octahedral

Square planar

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

SO₂

He₂

N₂

PCl₅

142. 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

656 nm

6.56 nm

65.6 nm

0.656 nm

143. 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 greater than in NO⁺

Bond length in NO⁺ is greater than in NO

Bond length in NO⁺ is equal to that in NO

144. Ionic radius in a period from left to right

Increases

Decreases

First decreases then increases

First increases then decreases

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

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

147. 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

148. Nuclear radiation is emitted by those elements whose

Nuclei are stable

Nuclei are unstable

Molecules are unstable

Molecules are stable

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

BF₃

SF₄

XeF₄

SiF₄

150. 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

Covalent attraction

Hydrogen bond formation

Page 7 of 8

151. Geometry of simple molecule having SP³ hybrid orbital is

Triangular

Linear

Tetrahedral

Square planner

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

Linear geometry

Dipole moment is zero

SP hybridization

None

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

3 and 9

3 and 5

2 and 5

3 and 7

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

NaCl

AlCl₃

SiCl₄

MgCl₂

155. Molecular orbital picture of N₂ indicates

One unpaired electron

No unpaired electron

None of these

Two unpaired electron

156. The velocity of photon is

Equal to square

Independent of its wavelength

Depends on its source

Depends on its wavelength

157. In O2 each oxygen atom is hybridized

All

Sp2

Sp3

158. Which molecule is polar among the following?

Carbon dioxide

Carbon tetrachloride

Methanol

Ethane

159. 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?

160. Bohr’s model atom is contradicted by

Quarternization of angular members

Plank’s quantum theory

Quarternization of energy of electrons

Heisenberg’s uncertainty principle

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

Pcl₄

N⁺H₄

PCl₃

CH₄

162. Effective magnetic moment of Sc³ ion is

2.83

1.73

5.92

163. 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

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

Activation energy

Electronegativity

Ionization potential

Electron affinity

165. 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

X₂Y₃

X₂Y

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

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

It has high electronegativity

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

It has high heat of dissociation

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

Both polar covalent and hydrogen bonds

Ionic and nonpolar hydrogen bonds

Nonpolar covalent bonds only

Hydrogen bonds only

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

3.0 BM

4.9 BM

5.9 BM

6.9 BM

169. 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

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

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

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

170. Fluorine molecule is formed by

The axial s-p overlap

The sidewise p-p overlap

The overlap of two sp² hybrid orbitals

The axial p-p overlap

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

Constant

Increases

Variable trend

Decreases

172. Energy of an atom in a compound is

No change

Lesser than individual

Impossible to predict

Higher than individual

173. When potassium metal is exposed to violet light

The absorption of electrons takes place

Ejection of electrons takes place

Ejection of some potassium atoms occurs

There is no effect

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

SP²

175. Pi bonds are produced by overlapping of

Hybrid orbitals

Hybrid and un hybrid orbitals

Un-hybrid orbitals

Atomic orbital and hybrid orbital

Page 8 of 8

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

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

Li⁺

He⁺

178. The boiling point of heavy water is

101.4°C

108°C

110°C

99°C

179. Which of the solid does not contain covalent bond

Graphite

Copper

Ice

Diamond

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

Liquid HCl

Liquid NH3

Phenol

Water

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

None of these

Electronegativity

Electron affinity

Ionization energy

182. The carbon atoms in calcium carbide are held by

Ionic bonds

2 covalent, one co-ordinate bond

2 sigma bonds

2π and one σ bond

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