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Standard XII
Chemistry
Stoichiometric Calculations
If NA is Av...
Question
If
N
A
is Avogadro's number, then number of valence electrons in 4.2 g of nitride ion
(
N
3
−
)
is:
A
2.4
N
A
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B
4.2
N
A
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C
1.6
N
A
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D
3.2
N
A
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Solution
The correct option is
B
2.4
N
A
Number of moles
=
4.2
14
=
0.3
mol
0.3
mol
=
0.3
×
N
A
ions.
⇒
8
×
0.3
×
N
A
electrons (as each ion contains
5
+
3
=
8
e
−
)
⇒
2.4
N
A
electrons
Hence, the correct option is A.
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