4.Which property is NOT characteristic of ionic compounds?

Ionic compounds have several characteristic properties. These include:

1. High melting and boiling points: Ionic compounds are made up of positive and negative ions which are held together by strong electrostatic forces of attraction. This makes them have high melting and boiling points.

2. Solubility in water: Ionic compounds are generally soluble in water. This is because water molecules are polar and can surround the positive and negative ions, pulling them away from the ionic lattice and causing them to dissolve.

3. Conductivity: When dissolved in water or melted, ionic compounds can conduct electricity. This is because the ions are free to move and carry charge.

4. Hard and brittle: Ionic compounds are hard because of the strong attraction between the ions. However, they are also brittle and can be broken apart by a sharp blow.

So, a property that is NOT characteristic of ionic compounds would be low melting and boiling points.