Question

The radius of divalent cation $M^{2+}$ is $94$pm and that of divalent anion $X^{2-}$ is $146$pm. Thus $M^{2+}{X}^{2-}$ has.

• A. NaCl structure
• B. Linear structure
• C. CsCl structure
• D. ZnS structure

Answer 1

The correct option is A NaCl structure

For $M^{2+}{X}^{-2}$

$\frac{r_{+}}{r_{-}}=\frac{94}{146}=0.6438$

Since, the radius ratio is in between $0.414$ to $0.732$, it has NaCl structure.