Question

Which of the following is not an ionic compound?

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

Answer 1

Answer: (D)

$AlC{l}_3$

$A{l}^{3+}$ is highly charged in nature and it can polarise the electron clouds of $Cl$ to a large extent. So, electrons get shared between the two ions. Hence, the compound is a covalent one, but the bond is polar covalent.

All others are ionic compounds.