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AIEEE 2008 Solved Paper
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© examsnet.com
Question : 5
Total: 104
Oxidising power of chlorine in aqueous solution can be determined by the parameters indicated below:
1
2
C
l
2
(
g
)
1
2
∆
diss
H
⊖
─
─
─
─
─
▶
C
l
(
g
)
∆
eg
H
⊖
─
─
─
─
─
▶
C
l
−
(
g
)
∆
Hyd
H
⊖
─
─
─
─
─
▶
C
l
−
(
aq
)
(Using the data,
∆
diss
H
C
l
2
Θ
=
240
kJ
/
mol
,
∆
e
g
H
C
l
Θ
=
−
349
kJ
/
mol
,
∆
hyd
H
C
l
−
Θ
=
−
381
kJ
/
mol
)
will be
+
152
kJ
mol
−
1
−
610
kJ
mol
−
1
−
850
kJ
mol
−
1
+
120
kJ
mol
−
1
Validate
Solution:
The energy involved in the conversion of
1
2
C
2
(
g
)
to
C
l
−
1
(
a
q
)
is given by
∆
H
=
1
2
∆
d
i
s
s
H
C
l
2
(
−
)
+
∆
e
g
H
C
l
(
−
)
+
∆
h
y
I
H
C
l
(
−
)
Substituting various values from given data, we get
∆
H
=
(
1
2
×
240
)
+
(
−
349
)
+
(
−
381
)
k
J
mol
−
1
=
(
120
−
349
−
381
)
k
J
mol
−
1
=
−
610
kJ
mol
−
1
i.e., the correct answer is
(
b
)
© examsnet.com
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