A) \[4.5\,A\]
B) \[9.0\,A\]
C) \[5.2\,A\]
D) None of these
Correct Answer: A
Solution :
Distance between nearest neighbours \[=2R=\frac{5.2\times \sqrt{3}}{2}=4.5\overset{\text{o}}{\mathop{\text{A}}}\,\]
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