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Byju's Answer
Standard XII
Chemistry
Covalent Bond vs Ionic Bond
Which terms a...
Question
Which terms are exothermic for the formation of
N
a
F
(
s
)
?
I.
N
a
(
g
)
→
N
a
+
(
g
)
+
e
−
II.
F
(
g
)
+
e
−
→
F
−
(
g
)
III.
N
a
+
(
g
)
+
F
−
(
g
)
→
N
a
F
(
s
)
A
I only
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B
II only
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C
I and III only
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D
II and III only
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Solution
The correct option is
D
II and III only
The first term indicates the ionization energy which is endothermic and has a positive value.
The second term indicates electron affinity which is exothermic and has a negative value.
The third term indicates lattice enthalpy which is exothermic and has a negative value.
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1
Similar questions
Q.
Which of the following reaction(s) is/are exothermic for the formation of
N
a
F
(
s
)
?
I.
N
a
(
g
)
→
N
a
+
(
g
)
+
e
−
II.
F
(
g
)
+
e
−
→
F
−
(
g
)
III.
N
a
+
(
g
)
+
F
−
(
g
)
→
N
a
F
(
s
)
Q.
Which of the following reaction(s) is/are exothermic for the formation of
N
a
F
(
s
)
?
I.
N
a
(
g
)
→
N
a
+
(
g
)
+
e
−
II.
F
(
g
)
+
e
−
→
F
−
(
g
)
III.
N
a
+
(
g
)
+
F
−
(
g
)
→
N
a
F
(
s
)
Q.
We consider formation of NaCl(s) using Born-Haber cycle which involves following steps:
(i)
N
a
(
s
)
1
2
C
I
2
⟶
N
a
C
I
(
s
)
Δ
H
=
Q
(II)
N
a
(
s
)
⟶
N
a
(
g
)
Δ
H
=
S
(III)
N
a
(
g
)
⟶
N
a
+
(
g
)
+
e
−
Δ
H
=
I
(IV)
1
2
C
I
2
(
g
)
⟶
C
I
(
g
)
Δ
H
=
D
2
(v)
C
I
(
g
)
+
e
−
⟶
C
I
−
(
g
)
Δ
H
=
?
(vI)
N
a
+
(
g
)
+
C
I
−
(
g
)
⟶
N
a
C
I
(
s
)
Δ
H
=
−
U
Can you derive value of (EA) of CI(g) atom.
Q.
If f(x) = log
e
(1 − x) and g(x) = [x], then determine each of the following functions:
(i) f + g
(ii) fg
(iii)
f
g
(iv)
g
f
Also, find (f + g) (−1), (fg) (0),
f
g
1
2
,
g
f
1
2
.
Q.
According to Born-Haber's cycle, the enthalpy of formation of ionic compounds can be determined. The formation of NaCl involves following steps –
(i)
N
a
(
s
)
S
−
−−−−−−−−−−−−
→
Energy of subtimation
N
a
(
g
)
(ii)
N
a
(
g
)
I
−
−−−−−−−−−−
→
Ionisation potenital
N
a
+
(
g
)
+
e
−
(iii)
C
l
2
(
g
)
D
−
−−−−−−−−−−−−−−
→
Bond dissociation energy
2
C
l
(
g
)
(iv)
C
l
(
g
)
+
e
−
E
−
−−−−−−−−−
→
Electron - affinity
C
l
−
(
g
)
(v)
C
l
−
(
g
)
+
N
a
+
(
g
)
U
−
−−−−−−−
→
Lattice energy
N
a
C
l
(
s
)
The enthalpy of formation of NaCl will be -
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