Question

If silver iodide crystallizes in a zinc blendek structure with $I^{-}$ ions forming the lattice, then the fraction of the tetrahedral voids occupied by $A{g}^{+}$ ions will be:

• A. 10%
• B. 25%
• C. 50%
• D. 75%

Answer 1

The correct option is C 50%

In $Agl,$ $I^{-}$ ions form the lattice.

Let the number of $I^{-}$ ion $=1$

There are two tetrahedral voids for 1 ion (sphere).

As there are one $A{g}^{+}$ ion in $AgI$ so fraction of tetrahedral voids occupied by$A{g}^{+}$ ions $=\frac{1}{2}$ or $50\%$

Option C is correct.