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Standard XI
Chemistry
Relation Between r and a
CsCl crystall...
Question
CsCl crystallizes in B.C.C lattice. If ‘a’ is its edge length then which of the following expressions is correct?
A
r
C
s
+
r
C
l
−
=
√
3
2
a
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B
r
C
l
−
+
r
C
s
=
√
3
a
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C
r
C
s
+
r
C
l
−
=
3
a
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D
r
C
s
+
r
C
l
−
=
3
a
2
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Solution
The correct option is
A
r
C
s
+
r
C
l
−
=
√
3
2
a
In CsCl structure,
C
s
+
ion is in contact with
C
l
−
ion at the nearest distance which is equal to
√
3
2
a
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