A) 217 pm
B) 210 pm
C) 220 pm
D) 205 pm
Correct Answer: A
Solution :
| \[\rho =\frac{\operatorname{ZM}}{{{\operatorname{N}}_{A}}V}\] |
| \[\operatorname{Z}=\frac{\rho {{\operatorname{N}}_{A}}V}{\operatorname{M}}=\frac{2\times 6\times {{10}^{23}}\times {{(5\times {{10}^{-8}})}^{3}}}{75}\] |
| \[\operatorname{Z}=2,\] which represent \[bcc\]structure |
| \[\therefore \text{ }r=\frac{\sqrt{3}}{4}a=\frac{\sqrt{3}}{4}\times 5=2.165\,\overset{\text{o}}{\mathop{\text{A}}}\,=216.5pm\approx 217pm\] |
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