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AIEEE 2002 Chemistry Solved Paper
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© examsnet.com
Question : 33
Total: 76
Na
and
Mg
crystallize in
BCC
and
FCC
type crystals respectively, then the number of atoms of
Na
and
Mg
present in the unit cell of their respective crystal is
4 and 2
9 and 14
14 and 9
2 and 4
Validate
Solution:
In bcc- points are at corners and one in the center of the unit cell.
Number of atoms per unit cell
=
8
×
1
8
+
1
=
2
.
In fcc - points are at the corners and also centre of the six faces of each cell.
Number of atoms per unit cell
=
8
×
1
8
+
6
×
1
2
=
4
.
© examsnet.com
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