Question

Which of the following is not an entirely ionic compound?

• A. $Ba{C}_2$
• B. $A{l}_2{O}_3$
• C. $Ca{H}_2$
• D. $AlC{l}_3$

Answer 1

The correct option is D $AlC{l}_3$

$A{l}^{3+}$ is highly charged in nature and it can polarise the electron clouds of $C{l}^{-}$ to a large extent. So, electrons get shared between the two ions. Hence, the compound has covalent nature.
All the other species are ionic in nature.