Question

Which of the following statements is/are true for $BaO$ and $MgO$ ?

• A. $BaO$ is more ionic than $MgO$
• B. $MgO$ is more ionic than $BaO$
• C. $BaO$ has a higher melting point than $MgO$
• D. $MgO$ has a higher melting point than $BaO$

Answer 1

Answer: (A), (D)

The correct options are
A $BaO$ is more ionic than $MgO$
D $MgO$ has a higher melting point than $BaO$

Electronegativity of $Ba$ is lower than $Mg$, so $BaO$ is more ionic.
$Mg$ has a much smaller radius than $Ba$ , so $MgO$ will have a higher melting point than $BaO$.

$M.P.MgO>BaO$
Ionic character $\alpha \Delta EN$