Question

The ionic radii of $x^{+}and{y}^{-}$ ions are 146 and 216 pm. The probable type of structure is

• A. CsCl type
• B. Rock salt type
• C. ZnS type
• D. $Ca{F}_2$ type

Answer 1

The correct option is B Rock salt type

$\frac{r_c^{+}}{r_a^{-}}=\frac{146}{216}=0.675$it is in the range of(0.414 – 0.732)
$\therefore$ C. No. = 6; NaCl type (Rock salt)