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Standard XII
Chemistry
Properties of Enthalpy
43. Why bond ...
Question
43. Why bond energy of C_C is more than N_N .C_C bond energy should decrease as c is gr14element and its size is more than N so bond length in case ofC should be more and bond energy less than N
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Q.
Select the incorrect statement(s) about
N
2
F
4
and
N
2
H
4
.
(i) In
N
2
F
4
, d-orbitals are contracted by electronegative fluorine atoms, but d-orbital contraction is not possible by H-atoms in
N
2
H
4
.
(ii) The
N
−
N
bond energy in
N
2
F
4
is more than
N
−
N
bond energy in
N
2
H
4
.
(iii) The
N
−
N
bond length in
N
2
F
4
is more than that in
N
2
H
4
.
(iv) The
N
−
N
bond length in
N
2
F
4
is less than that in
N
2
H
4
.
Choose the correct code.
Q.
Why is more energy required to break a sigma bond than to break a pi bond?
Q.
Consider the following chemical equation for the combustion of methane.
C
H
4
+
O
2
→
C
O
2
+
H
2
O
Q.
Consider the following chemical equation for the combustion of methane (
C
H
4
)
C
H
4
+
2
O
2
→
C
O
2
+
2
H
2
O
Q.
Explain why
N
2
has greater bond dissociation energy than
N
+
2
whereas
O
2
has lesser bond dissociation energy than
O
+
2
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