Which statement indicates that a substance may be an ionic compound?
it has a low melting point.
it is made up of molecules.
it can be flattened by a force.
it is made up of a crystal lattice.

A substance may be an ionic compound if is made up of molecules. 

An ionic compund has a higher melting point. For example, the usual salt you can have in your kitchen has a melting point around 800 Celsius degrees. SAlt can be defformed by a mechanic force but not in a significant way 

Your answer is b. codominant

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