Chemical Bonding Solved Examples | Chemistry for JEE Main & Advanced PDF Download

 Page 1


JEE Solved Example on Chemical Bonding 
JEE Mains 
Q1: The bond angle is minimum in 
(a) ????
?? +
 
(b) ???????? 
(c) ?? ?? ???? 
(d) ????
?? 
Ans: (c) 
NH
4
+
? sp
3
 hybridisation -109
°
28
'
. 
NOCl ? sp
2
 hybridisation -120
°
 
H
2
Se ? sp
3
 hybridisation because of lone pair bond angle gets minimized. 
SO
3
? sp
2
 hybridisation 120
°
. 
Q2: The observed dipole moment of ?????? molecule is ?? . ?????? . If ?? - ???? bond distance is ?? . ?????? Å 
and electronic charge is 4.8 × ????
-????
 e.s.u. The % polarity in ?????? will be 
(a) ?? . ?????? × ?? . ???? % 
(b) 
?? .?? ×?? .?????? ×????
-?? ?? .????
% 
(c) 
?? .???? ×??????
?? .?? ×?? .??????
% 
(d) 
?? .?? ×????
-????
?? .????
× ?????? % 
Ans: (c) 
Percentage polarity =
 observeddipolemomentof molecules ×100
 calculateddipole moment 
% 
Here observed dipole moment of HCl = 1.03D 
Calculated dipole moment of HCl = 4.8 × 10
-10
× 1.275 × 10
-8
 
= 4.8 × 1.275D 
Therefore, % polarity =
1.03
4.8×1.275
× 100%. 
Q3: Which of the following has same bond order as ????
+
has? 
(a) ????
-
 
(b) ?? ?? -
 
(c) ????
+
 
(d) none of them 
Ans: (a) 
NO
+
and CN
-
both have 14 electrons and also both will have the following configuration. 
?? 1 s
2
?? *
1 s
2
?? 2 s
2
?? *
2 s
2
(
?? 2?? ?? 2
?? 2?? 2
2
) ?? 2p
?? 2
 
Bond order of NO
+
=Bond order of CN
-
= 3. 
Page 2


JEE Solved Example on Chemical Bonding 
JEE Mains 
Q1: The bond angle is minimum in 
(a) ????
?? +
 
(b) ???????? 
(c) ?? ?? ???? 
(d) ????
?? 
Ans: (c) 
NH
4
+
? sp
3
 hybridisation -109
°
28
'
. 
NOCl ? sp
2
 hybridisation -120
°
 
H
2
Se ? sp
3
 hybridisation because of lone pair bond angle gets minimized. 
SO
3
? sp
2
 hybridisation 120
°
. 
Q2: The observed dipole moment of ?????? molecule is ?? . ?????? . If ?? - ???? bond distance is ?? . ?????? Å 
and electronic charge is 4.8 × ????
-????
 e.s.u. The % polarity in ?????? will be 
(a) ?? . ?????? × ?? . ???? % 
(b) 
?? .?? ×?? .?????? ×????
-?? ?? .????
% 
(c) 
?? .???? ×??????
?? .?? ×?? .??????
% 
(d) 
?? .?? ×????
-????
?? .????
× ?????? % 
Ans: (c) 
Percentage polarity =
 observeddipolemomentof molecules ×100
 calculateddipole moment 
% 
Here observed dipole moment of HCl = 1.03D 
Calculated dipole moment of HCl = 4.8 × 10
-10
× 1.275 × 10
-8
 
= 4.8 × 1.275D 
Therefore, % polarity =
1.03
4.8×1.275
× 100%. 
Q3: Which of the following has same bond order as ????
+
has? 
(a) ????
-
 
(b) ?? ?? -
 
(c) ????
+
 
(d) none of them 
Ans: (a) 
NO
+
and CN
-
both have 14 electrons and also both will have the following configuration. 
?? 1 s
2
?? *
1 s
2
?? 2 s
2
?? *
2 s
2
(
?? 2?? ?? 2
?? 2?? 2
2
) ?? 2p
?? 2
 
Bond order of NO
+
=Bond order of CN
-
= 3. 
Q4: The correct order of increasing bond angles is 
(a) ????
?? < ?????? ?? < ?????? ?? < ????
?? 
(b) ????
?? < ?????? ?? < ?????? ?? < ????
?? 
(c) ????
?? < ?????? ?? < ?????? ?? < ????
?? 
(d) ?????? ?? < ?????? ?? < ????
?? < ????
?? 
Ans: (a) 
As the size of surrounding atom increases the electronic repulsion increases bond angle increases. 
Q5: Which of the following is planar? 
(a) ?????? ?? 
(b) ?????? ?? ?? ?? 
(c) ?????? ?? ?? ?? 
(d) ?????? ?? 
Ans: (d) 
XeO
4
 - tetrahedral 
XeO
3
 F
2
 - trigonal bipyramidal 
XeO
2
 F
2
- trigonal bipyramidal 
XeF
4
 - square planar. 
Q6: Which of the following does not contain coordinate bond? 
(a) ????
?? -
 
(b) ????
?? +
 
(c) ????
?? ?? -
 
(d) ?? ?? ?? +
 
Ans: (c) 
CO
3
2
 - is 
Q7: The correct order in which the ?? - ?? bond length increases in the following is 
(a) ?? ?? < ?? ?? < ?? ?? ?? ?? 
(b) ?? ?? ?? ?? < ?? ?? < ?? ?? 
(c) ?? ?? < ?? ?? < ?? ?? ?? ?? 
(d) ?? ?? < ?? ?? ?? ?? < ?? ?? 
Ans: (a) 
H - O - O - H, O ? O = O, O = O 
0
''
?? 0
? O
O
S
O
 
Due to resonance in O
3
, O - O bond length will be in between O = O and O - O. 
Q8: Which species has the maximum number of lone pair of electrons on the central atom? 
(a) ?????? ?? -
 
(b) ?????? ?? 
(c) ????
?? 
(d) ?? ?? -
 
Ans: (d) 
In I
3
-
, central atom has 3 lone pair and two bond pair. 
Page 3


JEE Solved Example on Chemical Bonding 
JEE Mains 
Q1: The bond angle is minimum in 
(a) ????
?? +
 
(b) ???????? 
(c) ?? ?? ???? 
(d) ????
?? 
Ans: (c) 
NH
4
+
? sp
3
 hybridisation -109
°
28
'
. 
NOCl ? sp
2
 hybridisation -120
°
 
H
2
Se ? sp
3
 hybridisation because of lone pair bond angle gets minimized. 
SO
3
? sp
2
 hybridisation 120
°
. 
Q2: The observed dipole moment of ?????? molecule is ?? . ?????? . If ?? - ???? bond distance is ?? . ?????? Å 
and electronic charge is 4.8 × ????
-????
 e.s.u. The % polarity in ?????? will be 
(a) ?? . ?????? × ?? . ???? % 
(b) 
?? .?? ×?? .?????? ×????
-?? ?? .????
% 
(c) 
?? .???? ×??????
?? .?? ×?? .??????
% 
(d) 
?? .?? ×????
-????
?? .????
× ?????? % 
Ans: (c) 
Percentage polarity =
 observeddipolemomentof molecules ×100
 calculateddipole moment 
% 
Here observed dipole moment of HCl = 1.03D 
Calculated dipole moment of HCl = 4.8 × 10
-10
× 1.275 × 10
-8
 
= 4.8 × 1.275D 
Therefore, % polarity =
1.03
4.8×1.275
× 100%. 
Q3: Which of the following has same bond order as ????
+
has? 
(a) ????
-
 
(b) ?? ?? -
 
(c) ????
+
 
(d) none of them 
Ans: (a) 
NO
+
and CN
-
both have 14 electrons and also both will have the following configuration. 
?? 1 s
2
?? *
1 s
2
?? 2 s
2
?? *
2 s
2
(
?? 2?? ?? 2
?? 2?? 2
2
) ?? 2p
?? 2
 
Bond order of NO
+
=Bond order of CN
-
= 3. 
Q4: The correct order of increasing bond angles is 
(a) ????
?? < ?????? ?? < ?????? ?? < ????
?? 
(b) ????
?? < ?????? ?? < ?????? ?? < ????
?? 
(c) ????
?? < ?????? ?? < ?????? ?? < ????
?? 
(d) ?????? ?? < ?????? ?? < ????
?? < ????
?? 
Ans: (a) 
As the size of surrounding atom increases the electronic repulsion increases bond angle increases. 
Q5: Which of the following is planar? 
(a) ?????? ?? 
(b) ?????? ?? ?? ?? 
(c) ?????? ?? ?? ?? 
(d) ?????? ?? 
Ans: (d) 
XeO
4
 - tetrahedral 
XeO
3
 F
2
 - trigonal bipyramidal 
XeO
2
 F
2
- trigonal bipyramidal 
XeF
4
 - square planar. 
Q6: Which of the following does not contain coordinate bond? 
(a) ????
?? -
 
(b) ????
?? +
 
(c) ????
?? ?? -
 
(d) ?? ?? ?? +
 
Ans: (c) 
CO
3
2
 - is 
Q7: The correct order in which the ?? - ?? bond length increases in the following is 
(a) ?? ?? < ?? ?? < ?? ?? ?? ?? 
(b) ?? ?? ?? ?? < ?? ?? < ?? ?? 
(c) ?? ?? < ?? ?? < ?? ?? ?? ?? 
(d) ?? ?? < ?? ?? ?? ?? < ?? ?? 
Ans: (a) 
H - O - O - H, O ? O = O, O = O 
0
''
?? 0
? O
O
S
O
 
Due to resonance in O
3
, O - O bond length will be in between O = O and O - O. 
Q8: Which species has the maximum number of lone pair of electrons on the central atom? 
(a) ?????? ?? -
 
(b) ?????? ?? 
(c) ????
?? 
(d) ?? ?? -
 
Ans: (d) 
In I
3
-
, central atom has 3 lone pair and two bond pair. 
Q9: Which of the following compound has highest covalent character? 
(a) ???????? 
(b) ?????? 
(c) ???????? ?? 
(d) ???????? 
Ans: I. (c) 
More is the charge on cation, more is the polarisation of anion by cation. Hence, more is the covalent 
character. 
Q10: Which one of the following species is paramagnetic? 
(a) ?? ?? -
 
(b) ????
-
 
(c) ???? 
(d) ????
+
 
Ans: (a) 
Only O
2
-
has unpaired electrons in molecular orbital. 
Q11: The shape of ?????? ?? is 
(a) T-shaped 
(b) Tetrahedral 
(c) Triangular planar 
(d) Pyramidal 
Ans: (d) 
The state of hybridisation of Xe in XeO
3
 is sp
3
. Three corners of tetrahedron are occupied by the 
three O-atoms and the fourth corner is occupied by lone pair. Therefore shape of XeO
3
 is pyramidal. 
Q12: Which of the following is arranged in order of increasing dipole moment? 
(a) ?????? ?? < ????
?? < ?? ?? ?? < ????
?? 
(b) ?????? ?? < ????
?? < ????
?? < ?? ?? ?? 
(c) ????
?? < ????
?? < ?? ?? ?? < ?????? ?? 
(d) ?? ?? ?? < ????
?? < ????
?? < ?????? ?? 
Ans: (b) 
BCl
3
 is a planar species. Hence it has zero dipole moment. Out of NH
3
 and NF
3
, NH
3
 has higher 
dipole moment because of orientation of bond moments as shown 
? Correct order is BCl
3
< NF
3
< NH
3
< H
2
O. 
Q13: Predict the correct statement with regard to the bond orders of the species ????
+
, ???? and 
????
-
. 
(a) The bond order of ????
+
is greater than the bond orders of ???? and ????
-
. 
(b) The bond orders of ????
-
and ???? are greater than the bond order of ????
+
. 
(c) ????
+
and ????
-
have the same bond orders, while that of ???? is less than that of ????
+
or ????
-
. 
(d) The bond orders of ????
+
, ???? and ????
-
are 2,3 and 2.5 respectively. 
Ans: (b) 
The bond order of CN
+
, CN and CN
-
are 2, 2.5 and 3 respectively. 
Page 4


JEE Solved Example on Chemical Bonding 
JEE Mains 
Q1: The bond angle is minimum in 
(a) ????
?? +
 
(b) ???????? 
(c) ?? ?? ???? 
(d) ????
?? 
Ans: (c) 
NH
4
+
? sp
3
 hybridisation -109
°
28
'
. 
NOCl ? sp
2
 hybridisation -120
°
 
H
2
Se ? sp
3
 hybridisation because of lone pair bond angle gets minimized. 
SO
3
? sp
2
 hybridisation 120
°
. 
Q2: The observed dipole moment of ?????? molecule is ?? . ?????? . If ?? - ???? bond distance is ?? . ?????? Å 
and electronic charge is 4.8 × ????
-????
 e.s.u. The % polarity in ?????? will be 
(a) ?? . ?????? × ?? . ???? % 
(b) 
?? .?? ×?? .?????? ×????
-?? ?? .????
% 
(c) 
?? .???? ×??????
?? .?? ×?? .??????
% 
(d) 
?? .?? ×????
-????
?? .????
× ?????? % 
Ans: (c) 
Percentage polarity =
 observeddipolemomentof molecules ×100
 calculateddipole moment 
% 
Here observed dipole moment of HCl = 1.03D 
Calculated dipole moment of HCl = 4.8 × 10
-10
× 1.275 × 10
-8
 
= 4.8 × 1.275D 
Therefore, % polarity =
1.03
4.8×1.275
× 100%. 
Q3: Which of the following has same bond order as ????
+
has? 
(a) ????
-
 
(b) ?? ?? -
 
(c) ????
+
 
(d) none of them 
Ans: (a) 
NO
+
and CN
-
both have 14 electrons and also both will have the following configuration. 
?? 1 s
2
?? *
1 s
2
?? 2 s
2
?? *
2 s
2
(
?? 2?? ?? 2
?? 2?? 2
2
) ?? 2p
?? 2
 
Bond order of NO
+
=Bond order of CN
-
= 3. 
Q4: The correct order of increasing bond angles is 
(a) ????
?? < ?????? ?? < ?????? ?? < ????
?? 
(b) ????
?? < ?????? ?? < ?????? ?? < ????
?? 
(c) ????
?? < ?????? ?? < ?????? ?? < ????
?? 
(d) ?????? ?? < ?????? ?? < ????
?? < ????
?? 
Ans: (a) 
As the size of surrounding atom increases the electronic repulsion increases bond angle increases. 
Q5: Which of the following is planar? 
(a) ?????? ?? 
(b) ?????? ?? ?? ?? 
(c) ?????? ?? ?? ?? 
(d) ?????? ?? 
Ans: (d) 
XeO
4
 - tetrahedral 
XeO
3
 F
2
 - trigonal bipyramidal 
XeO
2
 F
2
- trigonal bipyramidal 
XeF
4
 - square planar. 
Q6: Which of the following does not contain coordinate bond? 
(a) ????
?? -
 
(b) ????
?? +
 
(c) ????
?? ?? -
 
(d) ?? ?? ?? +
 
Ans: (c) 
CO
3
2
 - is 
Q7: The correct order in which the ?? - ?? bond length increases in the following is 
(a) ?? ?? < ?? ?? < ?? ?? ?? ?? 
(b) ?? ?? ?? ?? < ?? ?? < ?? ?? 
(c) ?? ?? < ?? ?? < ?? ?? ?? ?? 
(d) ?? ?? < ?? ?? ?? ?? < ?? ?? 
Ans: (a) 
H - O - O - H, O ? O = O, O = O 
0
''
?? 0
? O
O
S
O
 
Due to resonance in O
3
, O - O bond length will be in between O = O and O - O. 
Q8: Which species has the maximum number of lone pair of electrons on the central atom? 
(a) ?????? ?? -
 
(b) ?????? ?? 
(c) ????
?? 
(d) ?? ?? -
 
Ans: (d) 
In I
3
-
, central atom has 3 lone pair and two bond pair. 
Q9: Which of the following compound has highest covalent character? 
(a) ???????? 
(b) ?????? 
(c) ???????? ?? 
(d) ???????? 
Ans: I. (c) 
More is the charge on cation, more is the polarisation of anion by cation. Hence, more is the covalent 
character. 
Q10: Which one of the following species is paramagnetic? 
(a) ?? ?? -
 
(b) ????
-
 
(c) ???? 
(d) ????
+
 
Ans: (a) 
Only O
2
-
has unpaired electrons in molecular orbital. 
Q11: The shape of ?????? ?? is 
(a) T-shaped 
(b) Tetrahedral 
(c) Triangular planar 
(d) Pyramidal 
Ans: (d) 
The state of hybridisation of Xe in XeO
3
 is sp
3
. Three corners of tetrahedron are occupied by the 
three O-atoms and the fourth corner is occupied by lone pair. Therefore shape of XeO
3
 is pyramidal. 
Q12: Which of the following is arranged in order of increasing dipole moment? 
(a) ?????? ?? < ????
?? < ?? ?? ?? < ????
?? 
(b) ?????? ?? < ????
?? < ????
?? < ?? ?? ?? 
(c) ????
?? < ????
?? < ?? ?? ?? < ?????? ?? 
(d) ?? ?? ?? < ????
?? < ????
?? < ?????? ?? 
Ans: (b) 
BCl
3
 is a planar species. Hence it has zero dipole moment. Out of NH
3
 and NF
3
, NH
3
 has higher 
dipole moment because of orientation of bond moments as shown 
? Correct order is BCl
3
< NF
3
< NH
3
< H
2
O. 
Q13: Predict the correct statement with regard to the bond orders of the species ????
+
, ???? and 
????
-
. 
(a) The bond order of ????
+
is greater than the bond orders of ???? and ????
-
. 
(b) The bond orders of ????
-
and ???? are greater than the bond order of ????
+
. 
(c) ????
+
and ????
-
have the same bond orders, while that of ???? is less than that of ????
+
or ????
-
. 
(d) The bond orders of ????
+
, ???? and ????
-
are 2,3 and 2.5 respectively. 
Ans: (b) 
The bond order of CN
+
, CN and CN
-
are 2, 2.5 and 3 respectively. 
Q14: ?? ?? /?? atoms of ?? ( ?? ) are converted into ?? +
( ?? ) by energy ?? ?? . ?? ?? /?? atoms of ?? ( ?? ) are 
converted into ?? -
( ?? ) by energy ?? ?? . Hence, ionization potential and electron affinity of ?? ( ?? ) are: ( 
?? ?? is Avogadro Number) 
(a) 
?? ?? ?? ?? ?? ,
?? ( ?? ?? -?? ?? )
?? ?? 
(b) 
?? ?? ?? ?? ?? ,
?? ?? ?? ?? ?? 
(c) 
( ?? ?? -?? ?? )
?? ?? ,
?? ?? ?? ?? ?? 
(d) ?? ?? ?? , ?? ?? ?? 
Ans: (d) 
X( g) ? X
+
( g)+ e 
If I is ionization energy then 
1
2
( I) = E
1
I = ?? ?? 1
 
If E is electron affinity then 
1
2
( E) = E
2
 
E = ?? E
?? 
Q15: In ?????? ?? , ?????? ?? and ?????? ?? the number of lone pair of electrons on ???? is respectively (Atomic 
numbers: ?? = ?? , ???? = ???? ) 
(a) ?? , ?? , ?? 
(b) ?? , ?? , ?? 
(c) ?? , ?? , ?? 
(d) ?? , ?? , ?? 
Ans: (d) 
XeF
2
: Xe has got 2 bond pairs and 3 lone pairs. 
XeF
4
 : Xe has got 4 bond pairs and 2 lone pairs. 
XeF
6
: Xe has got 6 bond pairs and 1 lone pair. 
The resonating structures of isocyanate ion ( NCO
-
) are 
O = C
 (i) 
= N
-
? -
 (ii) 
O - C = N ? 
+
O = C - N
(iii) 
N
2-
 
Q16: Choose the most stable resonating structure of ?????? -
and give oxidation states of ?? , ?? and ?? 
is that order. 
(a) (i) ?? ( -?? ) , ?? ( +?? ) , ?? ( -?? ) 
(b) (ii) ?? ( -?? ) , ?? ( +?? ) , ?? ( -?? ) 
(c) (iii) ?? ( -?? ) , ?? ( +?? ) , ?? ( -?? ) 
(d) (i) ?? ( ?? ) , ?? ( +?? ) , ?? ( -?? ) 
Ans: (b) 
Page 5


JEE Solved Example on Chemical Bonding 
JEE Mains 
Q1: The bond angle is minimum in 
(a) ????
?? +
 
(b) ???????? 
(c) ?? ?? ???? 
(d) ????
?? 
Ans: (c) 
NH
4
+
? sp
3
 hybridisation -109
°
28
'
. 
NOCl ? sp
2
 hybridisation -120
°
 
H
2
Se ? sp
3
 hybridisation because of lone pair bond angle gets minimized. 
SO
3
? sp
2
 hybridisation 120
°
. 
Q2: The observed dipole moment of ?????? molecule is ?? . ?????? . If ?? - ???? bond distance is ?? . ?????? Å 
and electronic charge is 4.8 × ????
-????
 e.s.u. The % polarity in ?????? will be 
(a) ?? . ?????? × ?? . ???? % 
(b) 
?? .?? ×?? .?????? ×????
-?? ?? .????
% 
(c) 
?? .???? ×??????
?? .?? ×?? .??????
% 
(d) 
?? .?? ×????
-????
?? .????
× ?????? % 
Ans: (c) 
Percentage polarity =
 observeddipolemomentof molecules ×100
 calculateddipole moment 
% 
Here observed dipole moment of HCl = 1.03D 
Calculated dipole moment of HCl = 4.8 × 10
-10
× 1.275 × 10
-8
 
= 4.8 × 1.275D 
Therefore, % polarity =
1.03
4.8×1.275
× 100%. 
Q3: Which of the following has same bond order as ????
+
has? 
(a) ????
-
 
(b) ?? ?? -
 
(c) ????
+
 
(d) none of them 
Ans: (a) 
NO
+
and CN
-
both have 14 electrons and also both will have the following configuration. 
?? 1 s
2
?? *
1 s
2
?? 2 s
2
?? *
2 s
2
(
?? 2?? ?? 2
?? 2?? 2
2
) ?? 2p
?? 2
 
Bond order of NO
+
=Bond order of CN
-
= 3. 
Q4: The correct order of increasing bond angles is 
(a) ????
?? < ?????? ?? < ?????? ?? < ????
?? 
(b) ????
?? < ?????? ?? < ?????? ?? < ????
?? 
(c) ????
?? < ?????? ?? < ?????? ?? < ????
?? 
(d) ?????? ?? < ?????? ?? < ????
?? < ????
?? 
Ans: (a) 
As the size of surrounding atom increases the electronic repulsion increases bond angle increases. 
Q5: Which of the following is planar? 
(a) ?????? ?? 
(b) ?????? ?? ?? ?? 
(c) ?????? ?? ?? ?? 
(d) ?????? ?? 
Ans: (d) 
XeO
4
 - tetrahedral 
XeO
3
 F
2
 - trigonal bipyramidal 
XeO
2
 F
2
- trigonal bipyramidal 
XeF
4
 - square planar. 
Q6: Which of the following does not contain coordinate bond? 
(a) ????
?? -
 
(b) ????
?? +
 
(c) ????
?? ?? -
 
(d) ?? ?? ?? +
 
Ans: (c) 
CO
3
2
 - is 
Q7: The correct order in which the ?? - ?? bond length increases in the following is 
(a) ?? ?? < ?? ?? < ?? ?? ?? ?? 
(b) ?? ?? ?? ?? < ?? ?? < ?? ?? 
(c) ?? ?? < ?? ?? < ?? ?? ?? ?? 
(d) ?? ?? < ?? ?? ?? ?? < ?? ?? 
Ans: (a) 
H - O - O - H, O ? O = O, O = O 
0
''
?? 0
? O
O
S
O
 
Due to resonance in O
3
, O - O bond length will be in between O = O and O - O. 
Q8: Which species has the maximum number of lone pair of electrons on the central atom? 
(a) ?????? ?? -
 
(b) ?????? ?? 
(c) ????
?? 
(d) ?? ?? -
 
Ans: (d) 
In I
3
-
, central atom has 3 lone pair and two bond pair. 
Q9: Which of the following compound has highest covalent character? 
(a) ???????? 
(b) ?????? 
(c) ???????? ?? 
(d) ???????? 
Ans: I. (c) 
More is the charge on cation, more is the polarisation of anion by cation. Hence, more is the covalent 
character. 
Q10: Which one of the following species is paramagnetic? 
(a) ?? ?? -
 
(b) ????
-
 
(c) ???? 
(d) ????
+
 
Ans: (a) 
Only O
2
-
has unpaired electrons in molecular orbital. 
Q11: The shape of ?????? ?? is 
(a) T-shaped 
(b) Tetrahedral 
(c) Triangular planar 
(d) Pyramidal 
Ans: (d) 
The state of hybridisation of Xe in XeO
3
 is sp
3
. Three corners of tetrahedron are occupied by the 
three O-atoms and the fourth corner is occupied by lone pair. Therefore shape of XeO
3
 is pyramidal. 
Q12: Which of the following is arranged in order of increasing dipole moment? 
(a) ?????? ?? < ????
?? < ?? ?? ?? < ????
?? 
(b) ?????? ?? < ????
?? < ????
?? < ?? ?? ?? 
(c) ????
?? < ????
?? < ?? ?? ?? < ?????? ?? 
(d) ?? ?? ?? < ????
?? < ????
?? < ?????? ?? 
Ans: (b) 
BCl
3
 is a planar species. Hence it has zero dipole moment. Out of NH
3
 and NF
3
, NH
3
 has higher 
dipole moment because of orientation of bond moments as shown 
? Correct order is BCl
3
< NF
3
< NH
3
< H
2
O. 
Q13: Predict the correct statement with regard to the bond orders of the species ????
+
, ???? and 
????
-
. 
(a) The bond order of ????
+
is greater than the bond orders of ???? and ????
-
. 
(b) The bond orders of ????
-
and ???? are greater than the bond order of ????
+
. 
(c) ????
+
and ????
-
have the same bond orders, while that of ???? is less than that of ????
+
or ????
-
. 
(d) The bond orders of ????
+
, ???? and ????
-
are 2,3 and 2.5 respectively. 
Ans: (b) 
The bond order of CN
+
, CN and CN
-
are 2, 2.5 and 3 respectively. 
Q14: ?? ?? /?? atoms of ?? ( ?? ) are converted into ?? +
( ?? ) by energy ?? ?? . ?? ?? /?? atoms of ?? ( ?? ) are 
converted into ?? -
( ?? ) by energy ?? ?? . Hence, ionization potential and electron affinity of ?? ( ?? ) are: ( 
?? ?? is Avogadro Number) 
(a) 
?? ?? ?? ?? ?? ,
?? ( ?? ?? -?? ?? )
?? ?? 
(b) 
?? ?? ?? ?? ?? ,
?? ?? ?? ?? ?? 
(c) 
( ?? ?? -?? ?? )
?? ?? ,
?? ?? ?? ?? ?? 
(d) ?? ?? ?? , ?? ?? ?? 
Ans: (d) 
X( g) ? X
+
( g)+ e 
If I is ionization energy then 
1
2
( I) = E
1
I = ?? ?? 1
 
If E is electron affinity then 
1
2
( E) = E
2
 
E = ?? E
?? 
Q15: In ?????? ?? , ?????? ?? and ?????? ?? the number of lone pair of electrons on ???? is respectively (Atomic 
numbers: ?? = ?? , ???? = ???? ) 
(a) ?? , ?? , ?? 
(b) ?? , ?? , ?? 
(c) ?? , ?? , ?? 
(d) ?? , ?? , ?? 
Ans: (d) 
XeF
2
: Xe has got 2 bond pairs and 3 lone pairs. 
XeF
4
 : Xe has got 4 bond pairs and 2 lone pairs. 
XeF
6
: Xe has got 6 bond pairs and 1 lone pair. 
The resonating structures of isocyanate ion ( NCO
-
) are 
O = C
 (i) 
= N
-
? -
 (ii) 
O - C = N ? 
+
O = C - N
(iii) 
N
2-
 
Q16: Choose the most stable resonating structure of ?????? -
and give oxidation states of ?? , ?? and ?? 
is that order. 
(a) (i) ?? ( -?? ) , ?? ( +?? ) , ?? ( -?? ) 
(b) (ii) ?? ( -?? ) , ?? ( +?? ) , ?? ( -?? ) 
(c) (iii) ?? ( -?? ) , ?? ( +?? ) , ?? ( -?? ) 
(d) (i) ?? ( ?? ) , ?? ( +?? ) , ?? ( -?? ) 
Ans: (b) 
Q17: Molecular shapes of ????
?? , ????
?? and ?????? ?? are 
(a) same with 2, 0 and 1 lone pairs of electrons respectively. 
(b) same with 1,1 and 1 lone pairs of electrons respectively. 
(c) different with 1,0 and 2 lone pairs of electrons respectively. 
(d) different with 1,1 and 1 lone pairs of electrons respectively. 
Ans: (c) 
In SF
4
, BP = 4, LP = 1, see-saw shaped. 
In CF
4
, BP = 4, LP = 0, tetrahedral shape. 
In XeF
4
, BP = 4, LP = 2, square planar shape. 
Q18: In which of the following process, the least energy is released? 
(a) ?? ( ?? )+ ?? -
? ?? -
( ?? ) 
(b) ?? ( ?? )+ ?? -
? ?? -
( ?? ) 
(c) ?? ( ?? )+ ?? -
? ?? -
?? ) 
(d) ?? ( ?? )+ ?? -
? ?? -
( ?? ) 
Ans: (a) 
2p
3
 of N has symmetrical electronic configuration. 
3p
4
 of s has unsymmetrical electronic configuration. 
Q19: In the formation of ?? ?? +
from ?? ?? , the electron is lost from a 
(a) ?? -orbital 
(b) ?? -orbital 
(c) ?? *
-orbital 
(d) ?? *
-orbital 
Ans: (a) 
M.O. configuration of N
2
 is: 
?? 1 s
2
?? *
1 s
2
?? 2 s
2
?? *
2 s
2
?? 2p
?? 2
= ?? 2p
?? 2
?? 2p
?? 2
 
M.O. configuration of N
2
+
is: 
1 s
2
?? *
1 s
2
?? 2 s
2
?? *
2 s
2
?? 2?? ?? 2
= ?? 2?? ?? 2
?? 2?? 2
1
.  
 
JEE Advanced  
Single Correct Type 
Among the following the maximum covalent character is shown by the compound: 
(A) NaCl 
(B) AlCl
3
 
(C) MgCl
2
 
(D) CaCl
2
 
(B)