A) In one unit cell there are 12 octahedral voids and all are completely inside the unit cell.
B) In one unit cell there are six octahedral voids and all are completely inside the unit cell.
C) In one unit cell there are six octahedral voids and of which three are completely inside the unit cell and other three are from contributions of octahedral voids which are partially inside the unit cell.
D) In one unit cell there are 12 tetrahedral voids, all are completely inside the unit cell.
Correct Answer: B
Solution :
[b] \[hcp=AB\text{ }AB\text{ }AB...\]pattern repeat For calculating voids between two layers A and B Total tetrahedral voids =12 out of which 8 are completely inside but rest are shared by other unit cells. Total octahedral voids = 6. All are completely inside.
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