Question

The number of octahedral voids in a unit cell of cubic close packed structure is:

• A. $1$
• B. $2$
• C. $4$
• D. $8$

Answer 1

The correct option is C $4$

$\to 1$ octahedral void at body centre.

$\to 12$ octahedral voids at edge centres which are shared by $4$ unit cells. $\frac{1}{12}\times 4=3$

Total $=3+1=4$