A) face centred
B) body centred
C) primitive
D) edge centred
E) simple
Correct Answer: A
Solution :
Density \[(\rho )=\frac{Z\times M}{{{a}^{3}}\times {{N}_{0}}}\] \[2.7=\frac{Z\times 27}{{{(405\times {{10}^{-10}})}^{3}}\times 6.023\times {{10}^{23}}}\] \[Z=\frac{2.7\times {{(405)}^{3}}\times {{10}^{-30}}\times 6.023\times {{10}^{23}}}{27}\] \[=4\] For face centred cubic unit cell, number of atoms are 4.
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