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The properties of several unknown solids were measured

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The properties of several unknown solids were measured. 
Solid Melting Point Other Properties A >1000 °C does not conduct electricity B 850 °C conducts electricity in the liquid state, but not in the solid state C 750 °C conducts electricity in the solid state D 150 °C does not conduct electricity 
Classify these solids. 
Ionic Molecular Metallic Covalent* 
A C B D 
*also known as covalent network solids, or macromolecular solids.