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Which statement best describes the typical properties of most ionic compounds?

1. high melting points and low boiling points
2. high melting points and nondirectional bonds
3. high solubilities in polar solvents and low solubilities in nonpolar solvents
4. three-dimensional network structures, and are good conductors of electricity in the molten state

Correct answer: three-dimensional network structures, and are good conductors of electricity in the molten state

Solution

Ionic compounds are giant 3D lattices of ions; they are nonconductors as solids but conduct in the molten/aqueous state where ions are mobile, making the last statement the most complete and correct description.

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