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Byju's Answer
Standard XII
Chemistry
Crystal Lattice and Unit Cell
The radii of ...
Question
The radii of
N
a
+
and
C
l
−
ions are
95
p
m
and
181
p
m
respectively. The edge length of
N
a
C
l
unit cell is:
A
276 pm
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B
138 PM
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C
552 pm
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D
415 pm
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Solution
The correct option is
C
552 pm
For
N
a
C
l
type crystal structure,
a
=
2
r
N
a
+
+
2
r
C
l
−
a
=
2
×
95
+
2
×
181
a
=
552
p
m
.
Hence, correct answer is option C.
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