Question

Which one of the following compounds has the ratio of radius of cation and anion smallest

• A. $NaCl$
• B. $NaF$
• C. $Mg{F}_2$
• D. $MgC{l}_2$

Answer 1

The correct option is D

$MgC{l}_2$

For the ratio of $\frac{C^{+}}{A^{-}}$ to be smallest $C^{+}$ should be small and $A^{-}$ should be big. Among $N{a}^{+}$ and $M{g}^{+2}$, $M{g}^{+2}$ is smaller and $C{l}^{-}$ is bigger than $F$