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Class 11 NEET Chemistry Some Basic Concepts Of Chemistry
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© examsnet.com
Question : 49
Total: 60
The total number of valence electrons in
4.2
g
of
N
3
−
ion is
(
N
A
is the Avogadro's number)
(1994)
2.1
N
A
4.2
N
A
1.6
N
A
3.2
N
A
Validate
Solution:
Each nitrogen atom has 5 valence electrons, therefore total number of electrons in
N
3
−
ion is
16
.
since the molecular mass of
N
3
is 42, therefore total number of electrons in
4.2
g
of
N
3
−
ion
=
4.2
42
×
16
×
N
A
=
1.6
N
A
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