Question

In a closed packing, the ratio of numbers of tetrahedral holes to that of octahedral holes is given by:

• A. $2:1$
• B. $1:2$
• C. $5:4$
• D. $1:1$

Answer 1

The correct option is A $2:1$

Number of tetrahedral voids $=2\times$ Number of octahedral voids

Hence, the ratio of tetrahedral holes to that of octahedral holes is given by $2:1$.

Option A is correct.