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AM CHEMISTRY > UNIT#10 CHEMICAL BONDING > Flashcards

UNIT#10 CHEMICAL BONDING Flashcards

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1
Q

Which of the following has largest ionic size?

A

N-3

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2
Q

In a period, the atomic radii:

A

Decrease

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3
Q

Which of the following is correct realtion for atmoic radius:

A

A->A>A+

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4
Q

Ionization energy depends upon:

A

➡Atomic/Ionic Radii
➡Nature of orbital
➡Shielding effect

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5
Q

Which of the following has highest ionization energy value:

A

He

I.E direclty proportional Stabilitiy of electronic configuration

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6
Q

Greater shielding effect corresponds to -__ ionization energy value

A

Lesser

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7
Q

The group that has maximum 1st ionization energy values:

A

ns^2, np^6

Octet is complete

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8
Q

Which of the following group has maximum 1st electron affinity value in same period?

A

VII A

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9
Q

Which of the following element has lowest electron affinity?

A

He

E.A inverseily proportional to stability of electronic configuration

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10
Q

An ionic compound A+B- is most likely to form when:

A

➡Ionization energy of A is Low

➡Electron affinity of B is high

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11
Q

Formation of ionic bond is favoured by:

A

Low Ionization Energy of metal

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12
Q

Maximum ionic character is exhibited by:

A

CsF

E.N difference of 3.3

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13
Q

All of the following species have dative bond except:

A

OH-

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14
Q

Co-oridinate covalent bond is present in;

A

Hydronium Ion

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15
Q

The percentage of co-ordinate covalent bond present in BF4- and NH4- respectively:

A

25% each

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16
Q

If the sharing of an electron pair is unequal and the atom have an electronegativity difference of 1.4 to 1.6, what is this type of sharing called:

A

Polar Covalent

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17
Q

The following molecules has linear structure except:

A

SO2

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18
Q

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

A

PCl3

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19
Q

Which pair has trigonal planar geometry?

A

➡BF3

➡AlH3

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20
Q

The shape of NH2- is:

A

Angular

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21
Q

WHich molecular gemoetry is not possible for AB4 type molecules

A

Trigonal Planar

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22
Q

The correct orer of bond angles is represented in:

A

CH4 >H2O> NF3>H2S

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23
Q

Which of the following has perect triangular structure:

A

SO3

AB3 type

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24
Q

Limitation to valence bond theory (VBT) is that:

A

It doesn’t explain paramagnetic behavior of O2

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25
Q

End to end overlapping of orbitals give rise to the formation of:

A

Sigma Bond

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26
Q

Pi bonds are formed by overlapping of:

A

Un-Hybrid Orbital

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27
Q

The concept of hybridization was given to remove which of the following drawbacks of V.B.T?

A

It could not explain tetravalency of carbon

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28
Q

Cl2 molecule is formed by the overlap of:

A

p-p head on overlapping of orbitals

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29
Q

The process in which the orbitals of different energies and shape mix with each other to give equivalent orbitals is called:

A

Hybridization

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30
Q

In which of the following species central metal atom is not sp3 hybridized:

A

NO3-

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31
Q

In ground state the unpaired electrons in carbon are:

A

2

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32
Q

The central atom which may not follow the octet rule while forming covalent bond

A

P

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33
Q

Which one shows high %age of the ionic character

A

HF

Directly related to electronegativity difference

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34
Q

Dipole moment gives the information about:

A

➡%ionic character
➡Bond angles
➡Geometry of the molecule

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35
Q

Bond length depends upon:

A

➡Hybridization on central atom
➡Nature of molecule
➡Size of central atom

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36
Q

Choose the incorrect relationship of bond energies:

A

➡Br-Br > I-I❌
➡Cl-Cl > F-F❌
➡C-C > N-N (Triple Bond)✅

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37
Q

The S.I unit of dipole moment is:

A

mC

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38
Q

Which of the following moelcules has non-zero dipole moment

A

CH3Cl

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39
Q

Maximum dipole moment is possessed by:

A

H2O

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40
Q

The experimentally determined bond legth of C-Cl is 176.7pm and C-C is 154 pm, what would be the radius o Cl atom:

A

99.7 pm

Bond Length= rc + rcl

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41
Q

All elements get thier stabilization to attain nearest configuration:

A

Noble Gases

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42
Q

The difference in the E.N values of the bonded atoms between two atoms is an index to ___ of covalent bond.

A

Polar Nature

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43
Q

p character in sp:

A

50%

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44
Q

Which bonds are present in moelcule of H2, according to VBT:

A

SIgma Bond

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45
Q

Due to ionic character, bond length:

A

Decreases

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46
Q

Which of the following bond has more energy:

A

Ionic

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47
Q

VBT proposed by:

A

L-Pauling

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48
Q

Hybridization in ethyne:

A

sp-sp

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49
Q

The geomerty of AB3 type molecule is:

A

Trigonal Planar

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50
Q

Number o unpaired electrons in CO+2 is:

A

3

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51
Q

Bond order of O2-2

A

1

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52
Q

The ionic radius is always _____ than the atomic radius from which it is derived:

A

Smaller

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53
Q

The valence electron pairs are arranged around the central atom to remain at maximum distance apart to keep repulsion:

A

Minimum

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54
Q

Geometry of AlCl3 is:

A

AB3

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55
Q

Which one is more electronegative:

A

F

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56
Q

All are AB2 type except:

A

SO3

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57
Q

Ionization energy is inversely proportional to:

A

➡Shielding Effect

➡Atomic size

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58
Q

Hybridziation of carbon in carbonyl group is:

A

sp2

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59
Q

Ionization energy depends on which of the following factors?

A

➡Size of atoms
➡Nuclear Charge
➡Number of shells

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60
Q

Angle in ammonia:

A

180

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61
Q

Bond length in alkyne:

A

1.34 A

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62
Q

Shape of H2S:

A

Angular

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63
Q

He follows:

A

Duplet Rule

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64
Q

Extened octet rule:

A

PCl5

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65
Q

The second ionization energy is maximum for:

A

Li

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66
Q

Valence shell electron pair repuslion theory is given as:

A

VSEPR

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67
Q

SnCl2 is an example of:

A

AB3

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68
Q

Which of the following has least bond energy

A

I2

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69
Q

VSEPR explains the:

A

Shape of molecules

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70
Q

Bond angle in water:

A

104.5 Degree

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71
Q

The ionization energy increases from left to right in a period due to increase in:

A

➡Nuclear Charge
➡Number of electrons
➡Atomic Number

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72
Q

Which of the following represent spin of two electrons in orbital:

A

+1/2, -1/2

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73
Q

The forces present within a molecule are called as:

A

Chemical Bonds

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74
Q

The moelcules like CH4, CCl4 or SiH4 show attitude of non-polarity due to:

A

Symmetry of structure

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75
Q

The electron affinity and atomic radius are ___ to each other:

A

Inversely Proportional

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76
Q

If a moelcule contains 4 electron apirs, The shape of molecule will be:

A

Tetrahedral

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77
Q

The unit of electron affinity is:

A

KJ/mol

78
Q

According to VSEPR, the repulsive force between the electron pairs of central atom of a molecule are in the order:

A

Lone Pair-Lone Pair>Lone Pair-Bond Pair>Bond Pair-Bond Pair

79
Q

What is the exact value of angle in BF3 :

A

120 Degree

80
Q

Which option show all the molecules with bond angle 109.5 degree.

A

SiCl4, NH4+, CH4

81
Q

The structure of Xenon Trioxide. With reference to the VSEPR theory, the shape of XeO3 is:

A

Trigonal Pyramidal

82
Q

Which of the following sets constitutes of all the molecules and ions of non-polar geometry?

A

CH4, NH4+, MnO4-, NF3

83
Q

The shape of CO2 moelcule is similar to;

A

BeF2

84
Q

What is the shape of ammonia NH3 molecule?

A

Pyramidal

AB3E

85
Q

The number of bonds in nitrogen molecule is:

A

One sigma and Two pi bonds

86
Q

When the two partially filled atomic orbital overlap in such a wall that the probability of finding the electron is maximum around the line joining the two nuclei, the result is the formation of:

A

Sigma Bond

87
Q

pi-bond is formed by sideways overlap of:

A

p-orbital

88
Q

The angle between un-hybridized p-orbital and three sp2 hybridized orbitals of each carbon atom is:

A

90 degree

89
Q

Which of the following molecule has largest number of shared pair electrons?

A

C2H4

90
Q

Which one of the following molecules has sp3 hybridization:

A

CH4

91
Q

Which of the following molecule has zero dipole moment?

A

BF3

92
Q

Which of the following has zero dipole moment:

A

BF3

93
Q

Among the following molecules, which one has coordinate covalent (dative) bond?

A

CO

94
Q

Which of the following molecule has zero dipole moment?

A

BF3

95
Q

For formation of ionic bond, electronegativity difference should be:

A

More than 1.7

96
Q

The ionization energy of hydrogen atom is:

A

1313kJ/mole

97
Q

The elements for which the value of ionization energy is low can:

A

Lose electron readily

98
Q

Electron affinity of the atom is the energy released when:

A

Electron is added to gaseous atom

99
Q

The shielding effect of inner electron is responsible for:

A

Decreasing ionization energy

100
Q

What will be the shape of a molecule which contains two sigma bond pairs and one lone pair?

A

V shape

101
Q

A molecule which contains two lone pairs and two bond pairs of electrons in valence shell of central atom, geometrical shape of molecules will be:

A

Angular

102
Q

Fe+2 will from the most ionic bond with:

A

F-1

Metallinc cation combines with most electronegative atom like F-1 to form most ionic bond

103
Q

Which of the following elements has lowest first ionization energy?

A

B

104
Q

Which one of the following elements has the largest second ionization energy?

A

F

105
Q

The bond angle in H2S is less than H2O, it is due to:

A

The small size of the oxygen atom

106
Q

In the second period of elements, although oxygen lies next to nitrogen yet its first ionization energy is lower than that of nitrogen because:

A

In oxygen, there exists repulsion between pair of electrons present in the same orbital of valence shell

107
Q

Which of the following has the highest value of electronegativity?

A

F

108
Q

Which of the following hybrid orbital have maximum s-character?

A

sp

109
Q

The first ionization energy is maximum for

A

Mg

110
Q

Which of the following has largest ionic size:

A

N^-3

Greater the negative charge, greater the size of ion

111
Q

Which of the following is correct relation for atomic radius:

A

A- > A > A+

112
Q

For which molecule the bonding pair of electrons is equally shared between the atoms?

A

H2

113
Q

An element with highest first ionization energy?

A

Nitrogen

114
Q

Which factor does not effect ionization energy across the period:

A

Number of shell

115
Q

Elements with ____ first ionization energies and ____ electron affinities generally form cations:

A

➡Low

➡Positive or Slightly Negative

116
Q

Which pair of species have electronic configuration ends on 2s2 2p6 in their highest occupied energy level.

A

➡Na+

➡O-2

117
Q

Which of the following have their outer most shell complete in atomic form:

A

Noble Gases

118
Q

An atom loses or gains electrons, to:

A

➡Gain stability
➡Form a bond
➡Complete its outermost shell

119
Q

Which of the following compounds does not obey octet rule:

A

➡PF3❌
➡BF3✅
➡NF3❌
➡AsF3❌

120
Q

The compound which have three types of bonds is:

A

NH4Cl

121
Q

A compound which is most ionic in nature:

A

RbF

Due to High electonegativity difference

122
Q

Which of the following solid does not contain covalent bond:

A

Copper

123
Q

Structure of AlCl3:

A

Triangular structure

124
Q

Structure of NH3, PH3, H3O+

A

Trigonal Pyramidal

125
Q

Which have bond angle of 120°?

A

➡BF3
➡AlCl3
➡C2H4

126
Q

NH3 has bond angle:

A

107.5°

127
Q

Structure of ammonia is:

A

Pyramidal

128
Q

In NH3 and NF3 molecules the bond angle is;

A

NH3 > NF3

Due to attachment of more electronegative atoms

129
Q

Which type of bond is formed by overlap of p-orbitals perpendicular to the two nuclei:

A

Pi(π) bond

130
Q

Hybridization is the extended form of ___ theory.

A

Valence Bond

131
Q

Pi(π) bond:

A

Decreases bond length

132
Q

The percentage of s-character in hybrid orbital which indicates shortest bond length:

A

50% s-character

133
Q

When water donates its electron pair to hydrogen ion to form hydronium ion, hybridization is changed from;

A 
Remains unchanged
(In H2O sp3 and in H3O+ sp3)
134
Q

The hybridization state of ‘S’ in SO3 similar to that of:

A

C in C2H4

135
Q

Which of the following is the most stable element:

A

Nitrogen

Nitrogen is the most stable element because its bond energy is higher

136
Q

Which one has highest average bond energy?

A

N≡N

Due to smaller size and multiple bonds

137
Q

When bond order increases, then bond length becomes ____ and the bond becomes:

A

➡Shorter

➡Stronger

138
Q

The bond energy of Cl-Cl bond is;

A

242 kJ/mol

139
Q

Which one has dipole moment?

A

o-Dichlorobenzene

140
Q

Ionic compounds do not show the phenomeon o isomerism because bonds are:

A

➡Non-Directional

➡Non-Rigid

141
Q

Which among the following has net dipole moment?

A

S2Cl2

142
Q

Which of the following statements is incorrect

A

➡Among halogens chlorine has maximum electron affinity❌
➡Along the period M.P and B.P increases upto IVA group❌
➡Among Be, B, C and N, the Be element has minimum ionization energy value✅
➡Cs is the most electropositive and F is the most electronegative element❌

143
Q

Which order of first ionization energy is correct:

A

Al < Mg

144
Q

First electron affinity is maximum for:Which factor does not effect I.E. across the periodWhich factor does not effect I.E. across the period

A

Chlorine

145
Q

Which factor does not effect I.E. across the period

A

➡Number of shells

➡Shielding Effect

146
Q

Which of following does not affect I.E in group:

A

Nature of orbital

147
Q

Which group of periodic table shown generally abnormal trends of ionization energy?

A

➡IIIA

➡VIA

148
Q

In general, ionization energy increases along the period. The group which show maximum ionization energy?

A

VIIIA

149
Q

The valence shell is:

A

The highest energy level occupied by electrons

150
Q

Which of the following has the least bond angle:

A 
➡BCl3 = 120°
➡NH3 = 107.5°
➡H2O = 104.5°
➡CH4 = 109.5°
151
Q

A compound which has all the three types of chemical bonds:

A

➡CuSO4 . 5H2O
➡NaBH4
➡NH4Cl

152
Q

In which of the following can donate an electron pair to the central atom?

A

There is no lone pair in central atom of BF3, H3O+ and AlCl3

153
Q

Which among the following bonds shows the maximum bond strength?

A

Sigma Bond

154
Q

Correct statement when coordinate covalent bond is formed between NH3 and BF3:

A

Ammonia donates its lone pair to 2p orbital of Boron

155
Q

Which of the following molecules contains maximum number of lone pairs:

A

Chlorine gas

156
Q

A compound which is most ionic in nature:

A

RbF

Due to high electronegativity difference

157
Q

Bonding in phosphonium ion is ____ percent covalent:

A

75

158
Q

Which of the following molecules contains six bonding electrons:

A

NF3

159
Q

%age of coordinate covalent bond in NH4+:

A

25%

160
Q

Which one has lone pair with central atom:

A

H2O

161
Q

The shape of is NH2-1

A

Angular

162
Q

All of the following pairs have same shapes except:

A

➡SO2

➡AlCl3

163
Q

Bond angle in paraffins is:

A

109.5°

164
Q

Which molecule is planar:

A

C2Cl4

165
Q

Which one of the following has maximum bond angle:

A

CO2

166
Q

Choose the species that is incorrectly matched with the shape of the central atom:

A 
➡CF4 = Tetrahedral❌
➡BeCl2 = Linear❌
➡H2O = Tetrahedral✅
➡NH3 = Pyramidal❌
167
Q

According to VSEPR theory, a moelcule with the general formula AX4 with one lone pair will have a _____ molecular shape.

A

Trigonal Pyramidal

168
Q

Total no. of sigma electrons in one molecule of C2H2:

A

6

169
Q

The carbon number 2 in the structure CH2=CH-CH2-CH3 shows a type of hybridzation:

A

sp2

170
Q

In which of the followings central atom is not hybridized:

A

AlH3

171
Q

In which of the following molecules central atom is not sp3 hybridized:

A

SnCl2

172
Q

In which of the following compound, carbon atoms has sp2 hybridization only:

A

1,3-butadiene

173
Q

Which are the species in which central atom undergoes sp3 hybridization?
(i) SnCl2
(ii) NF3
(iii) SO4 -2
(iv) H2S
Select the correct answer using the code given below:

A

➡ii
➡iii
➡iv

174
Q

All the atoms are coplanar in the molecule:

A

BF3

175
Q

Which hybrid orbitals are sued for bonding in triangular pyramidal molecule:

A

sp3

176
Q

In the resonance structure of benzene the number of σ-bonds and π delocalized electrons are respectively:

A

➡12

➡6

177
Q

The hybridization associated with the central atom of a molecule in which all the bond angles are 120° is:

A

sp2

178
Q

In NH3, the covalent bonds are formed by:

A

s-sp3 overlap

179
Q

Which of the followign has largest carbon-carbon bond length:

A

C2H6

180
Q

The order of bond strength as a result of following head to head overlapping is;

A

p-p > s-p > s-s

181
Q

Strongest bond among the followign is;

A

H-H

182
Q

The molecule having highest bond energy is;

A

C ≡ O

183
Q

Which of the following has minimum bond dissociation energy:

A

I2

184
Q

Which of the following is the best explaination that CO2 is non-polar molecule:

A

Net Dipole moment is zero

185
Q

____ has highest dipole moment.

A

CHCl3

186
Q

Covalent compounds show the phenomenon of isomerism because covalent bonds are:

A

➡Directional

➡Rigid

187
Q

A molecule which does not have zero dipole moment

A

CO

188
Q

Which of the following is most polar?

A

CH3F

189
Q

Which of the following compounds is non-polar?

A

CO2

190
Q

Greater the dipole moment:

A

Greater is the ionic nature

191
Q

NH3 has net dipole moment but BF3 has zero dipole moment becasue of;

A

➡NH3 is pyramidal

➡BF3 is trigonal planar

AM CHEMISTRY (19 decks)

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