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ECAT Chemistry Chemical Bonding Online Test

Maan AliLast Updated: April 19, 2025

Chemistry Chemical Bonding MCQS Online Test

ECAT 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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ECAT Chemistry Chemical Bonding Test

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Page 1 of 8

Chemistry

1. Unit of dipole moment is

Newton

Debye

Pascal

Poise

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

H – SH

H – Cl

H – NH₂

H – OH

3. The number of significant figures in 0.00200 is

Two

Five

Three

One

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

1.7588 x 10¹¹

9.1095 x 10¯³¹

1.7588 x 10²⁰

6.02 x 10²³

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

1 electron

4 electrons

2 electrons

6 electrons

6. The shape of the molecule SF₂Cl₂ is

Tetrahedral

Octahedral

Trigonal bipyramidal

Cubic

7. 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

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

HCl

HBr

9. 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⁺

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

Pcl₄

CH₄

N⁺H₄

PCl₃

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

X-rays not produced

Gamma rays

Larger wavelength

Shorter wavelength

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

S¯²

Cl¯

Na⁺

K⁺

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

2, 9

2, 6

2, 10

2, 8

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

Neutron

All these

Proton

Electron

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

6.63 x 10¯³³ m

6.63 x 10¯³⁵ m

6.63 x 10¯³⁴ m

6.65 x 10¯³⁵ m

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

9 x ɜ₀

1/2 x ɜ₀

3 x ɜ₀

6 x ɜ₀

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

Electron affinity

Electro negativity

None of these

Ionization energy

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

Three unpaired electrons

Bond order of 2.5

Stability lower then O₂

Diamagnetic character

19. Pi bonds are produced by overlapping of

Un-hybrid orbitals

Hybrid orbitals

Atomic orbital and hybrid orbital

Hybrid and un hybrid orbitals

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

Se, Te

Ge, Sn

As, Sb

In, Pt

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

SP²

22. Which molecule is polar among the following?

Methanol

Carbon dioxide

Ethane

Carbon tetrachloride

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

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

They are formed when electros are formed from atoms

24. Which of these molecules require more bond energy?

Nitrogen

Hydrogen

Oxygen

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

Ionization potential

Electron affinity

Electronegativity

Activation energy

Page 2 of 8

26. A lone pair of electrons in an atom implies

A pair of electrons involved in bonding

A pair of valence electrons

A pair of valence electrons not involved in bonding

A pair of electrons

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

Liquid HCl

Phenol

Liquid NH3

Water

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

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

Hydrogen sulphide is a weak acid

Water molecules associate through hydrogen bonding

Water has higher molecular weight

Sulphure has high electronegativity than oxygen

30. The ionization energy

Does not change in a group

Does not change in a period

Generally increases from left to right in a period

Increase from top to bottom in a group

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

Distillation

Colour spectrum

Vaporization

Crystallization

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

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

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

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

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

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

3 n

2 n

Impossible to predict

34. Energy of an atom in a compound is

Impossible to predict

Lesser than individual

Higher than individual

No change

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

AlCl₃

SiCl₄

NaCl

MgCl₂

36. Pick out the molecule which has zero dipole moment

NH₃

BCl₃

H₂O

SO₂

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

Bond

Attractive force

Interaction

All of above represent same entity

38. Anti-bonding MO is formed by

Multiplication of atomic orbitals

None of these

Subtraction of atomic orbitals

Addition of atomic orbitals

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

Electronegativity

Ionization energy

Atomic size

Electron affinity

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

SF₄

BF₃

XeF₄

SiF₄

41. Shape of CIO₃¯ is

Triangular bipyramidal

Triangular planar

Triangular pyramidal

Tetrahedral

42. 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

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

H₂O

CH₄

NaCl

CHCl₃

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

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

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

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

4, 1, 0, ½

4, 1, 1, ½

4, 4, 0, ½

4, 0, 0, ½

46. Which one of these is weakest?

Van der Waal’s forces

Ionic bond

Metallic bond

Covalent bond

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

Octahedral

Linear

Distorted tetrahedral

Planar triangle

48. 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 have high ionization energies

They are mono atomic gases

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

Constant

Increases

Decreases

Variable trend

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

5….0

0….5

1….5

5….1

Page 3 of 8

51. 2nd orbit is away from nucleus for H-atom as compared to first orbit

6-times

2-times

4-times

3-times

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

53. The shape of H₃O⁺ is

Angular

Pyramidal

Triangular planar

Tetrahedral

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

CH₃Cl

HCl

CCl₄

H₂O

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

H₂O

CH₄

BH₃

NH₃

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

57. 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?

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

90°

120°

60°

109°

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

Calcium

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

H₂O

H₂Te

H₂O

H₂S3

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

Fluorides are more electronegative

Fluorides is more electronegative

Boron trifluoride is pyramidal in shape while NH₃ is planar

NH₃ is pyramidal in shape while BF₃ is planar

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

None of these

Orbital overlap will not occur

Bonding will not occur

Both A and B are correct

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

No specificity exist

Equal to 1.7

Lesser then 1.7

Greater than 1.7

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

Triangular

Tetrahedral

Trigonal

Pyramidal

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

SP hybridization

Linear geometry

Dipole moment is zero

None

66. 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

67. 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

68. Which of the following species is paramagnetic?

CO₂

O²¯

CN¯

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

He₂

SO₂

N₂

PCl₅

70. Nuclear radiation is emitted by those elements whose

Nuclei are stable

Molecules are stable

Molecules are unstable

Nuclei are unstable

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

Electro negativity

Electron affinity

Ionization energy

None of these

72. Electronic configuration of K is

[AR]4S¹

[Kr]4S¹

[He]4S¹

[AR]4S²

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

Charged particles

Move with speed as that of light

Can be deflected by magnetic fields

A stream of electrons

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

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

Page 4 of 8

76. Choose the correct statement

Each bonding molecular orbital can accommodate only one electron

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

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

77. Ionic radius in a period from left to right

Increases

Decreases

First increases then decreases

First decreases then increases

78. Which of the following is not isoelectronic?

O²¯

Cl¯

Na⁺

Mg²⁺

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

Octahedral

Triangular

Square planner

Trigonal bipyramidal

80. 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 less than 1st ionization energy

It is equal to the 1st ionization energy

It is always greater than 1st ionization energy

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

82. 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

83. Molecular orbitals are filled according to

Aufbau principal

All these

Hund’s rule

Pauli’s exclusion principle

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

Remains constant

Decreases

Increases

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

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

Planar triangle

Tetrahedral

Pyramidal

Square planar

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

No effect

Greater

Remain same

Lesser

87. The boiling point of heavy water is

101.4°C

99°C

110°C

108°C

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

Fifth Bohr orbit to the second Bohr orbit

Sixth Bohr orbit to the third Bohr orbit

Fourth Bohr orbit to the first Bohr orbit

Seventh Bohr orbit to the third Bohr orbit

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

First increases then decreases

Increases

First decreases then increases

Decreases

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

Hydrogen

Nitrogen

Helium

Oxygen

91. Which of the solid does not contain covalent bond

Copper

Ice

Diamond

Graphite

92. An oxygen atom has mass of

5.316 x 10¯²³ g

2.657 x 10¯²³ g

5.316 x 10¯²³ g

16g

93. Molecular orbital picture of N₂ indicates

No unpaired electron

None of these

One unpaired electron

Two unpaired electron

94. Bohr’s model atom is contradicted by

Quarternization of energy of electrons

Plank’s quantum theory

Quarternization of angular members

Heisenberg’s uncertainty principle

95. In O2 each oxygen atom is hybridized

Sp2

All

Sp3

96. The carbon atoms in calcium carbide are held by

Ionic bonds

2 sigma bonds

2 covalent, one co-ordinate bond

2π and one σ bond

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

Both are equal

Cannot be determined

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

NH₃

H₂O

BF₃

BrF₃

99. 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

Water should be preferred over lemon Juice for drinking

There may be a possibility of a chemical reaction

100. 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

Page 5 of 8

101. Al become isoelectronic with Ne

By gaining three electrons

By losing two electrons

By gaining two electrons

By losing three electrons

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

X – radiation, visible, infrared, microwave

Visible, ultraviolet, infrared, gamma rays

Radio, visible, infrared, ultraviolet

Microwave, infrared, visible, ultraviolet

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

4.9 BM

5.9 BM

3.0 BM

6.9 BM

104. Geometry of simple molecule having sp3 hybrid orbital is

Tetrahedral

Linear

Triangular

Square planner

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

3 bond pair one lone pair

1 bond pair 3 lone pair

3 lone pair 1 bond pair

2 bond pair 2 lone pair

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

London force

Van der Waal’s force

Dispersion force

Chemical bond

107. Lateral overlapping expected in

O-bond

Ionic bond

Ā-bonds

Metallic bond

108. Which carbon is more electronegative?

sp³-hybridized carbon

sp²- hybridized carbon

sp- hybridized carbon

always same irrespective of its hybrid state

109. 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 electronegativity

It has high heat of dissociation

110. Geometry of simple molecule having SP³ hybrid orbital is

Triangular

Linear

Square planner

Tetrahedral

111. 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

sp² hybrid orbitals

sp³ hybrid orbitals

s orbitals

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

113. Inter molecular forces in solid hydrogen are

Covalent forces

All of these

Van der Waal forces or London dispersion forces

Hydrogen bonds

114. XeF₄ has shape of

Square planar

Sphere

Trigonal bipyramidal

Tetrahedral

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

O and F

Na and F

C and F

N and F

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

Trigonal bipyramidal

Pyramidal

Angular

Planar

117. 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

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

He⁺

Li⁺

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

Zero

-54.4 eV

-13.6 eV

-5.44 eV

120. Bond angle in water is

120°

104.5°

107°

109.5°

121. Maximum hydrogen bonds in water are,

122. Which of the following molecule has Ā bond

NH₃

H₂O

O₂

C₃H₆

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

Lone pair – bond pair repulsion only

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

Bond pair – bond pair repulsion only

Lone pair – lone pair repulsion only

124. Along a period the atomic radii

Increases

Constant

First decreases then increases

Decreases

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

Page 6 of 8

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

127. Covalent compounds are soluble in

All solvents

Concentrated acids

Non-polar solvents

Polar solvents

128. On sp3 hybridization

One s and 3 p-orbitals are involved

One p-orbital is involved

All p-orbitals are involved

Four p-orbitals are involved

129. Which has the minimum bond angle?

H₂S

NH₃

H₂O

CH₄

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

131. The velocity of photon is

Depends on its source

Depends on its wavelength

Equal to square

Independent of its wavelength

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

CH₄

NH₄Cl

HCN

H₂O₂

133. 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

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

135. 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

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

137. Which of the following has zero depolemoment?

PCl₃

CFCl₃

ClF

SiF₄

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

139. Number of π-bonds in naphthalene is

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

One sigma, one pi

Two sigma, two pi

Two sigma, one pi

One sigma, two pi

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

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

3, 2, 1

2, 1, 1

2, 1, 0

3, 1, 1

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

144. The structure of ICl₂¯ is

Octahedral

Square planar

Trigonal bipyramidal

Trigonal

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

Electronegative character of elements

Pauli exclusion principle

Octet rule

Electropositive character of elements

146. 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

147. ____________ has their outermost shell complete in atomic form

Noble gases

Alkali metals

Gun metals

Coinage metals

148. Number of sigma bonds in P₄O₁₀ is

149. Which of the following has unchanged valency?

Oxygen

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

H₂O

HCl

HBr

Page 7 of 8

151. 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

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

Prism

Cube

Hexagon

Tetrahedron

153. The nature of positive rays depends upon

All of these

The nature of discharge tube

The nature of residual gas

The nature of electrode

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

He⁺

Li⁺

155. Quantum umber values for 2p orbitals are

n = 1, l = 2

n = 2, l = 0

n = 2, l = 1

n = 1, l = 0

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

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

Zn⁺

Cu⁺

Ni³⁺

Fe²⁺

158. 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

16 and 4

12 and 5

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

Sublimation of metallic sodium to give yellow vapour

Low ionization energy of sodium

Photosensitivity of sodium

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

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

Ionization energy

Electron affinity

None of these

Electronegativity

161. When potassium metal is exposed to violet light

Ejection of some potassium atoms occurs

The absorption of electrons takes place

Ejection of electrons takes place

There is no effect

162. 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

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

SP²

164. Fluorine molecule is formed by

The overlap of two sp² hybrid orbitals

The sidewise p-p overlap

The axial s-p overlap

The axial p-p overlap

165. Effective magnetic moment of Sc³ ion is

1.73

2.83

5.92

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

9, 4

10, 3

4, 9

3, 10

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

HCI

H2O

HBr

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

H-bonding

Ion-dipole interaction

Dipole-dipole interaction

Dispersion force

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

I.P

E.N

Ea.

E.A

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

Excited state of fluorine

Excited state of neon

Excited state of O¯₂

Ground state of fluorine atom

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

Copper

Iron

Chromium

Nickel

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

The attractive forces dominate the repulsive forces

The two atoms start ionization

The repulsive force dominate the attractive forces

They energy of atoms increases

173. Hydrogen chloride molecule contains

Co-ordinate bond

Covalent bond

Electrovalent bond

Double bond

174. Lewis acids are

Electron deficient

Electron rich

Octet is complete

No such acids exist

175. H-bonding is not present in

Hydrogen fluoride

Water

Hydrogen sulphide

Glycerine

Page 8 of 8

176. 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

-2.22

-1.48

-1.11

177. Unit of dipole moment is

Newton

Poise

Debye

Pascal

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

Low very negative

Low, positive or slightly negative

High, very negative

None of these

179. Bond order for N2 molecule is

180. 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 is unpredictable

Bond length in NO⁺ is greater than in NO

181. 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

182. 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

6.56 nm

65.6 nm

0.656 nm

656 nm

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Maan AliLast Updated: April 19, 2025

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