You find out that it does not dissolve in water, has a very high melting point and conducts electricity when molten. The substance is probably
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The properties mentioned (does not dissolve in water, has a very high melting point, and conducts electricity when molten) are characteristic of ionic compounds. Ionic compounds are composed of positively charged ions (cations) and negatively charged ions (anions) held together by electrostatic forces.
The lack of solubility in water suggests that the substance forms a non-conductive solid when in contact with water, pointing towards an ionic nature. The high melting point is a characteristic feature of many ionic compounds due to the strong electrostatic forces between ions.
Additionally, the ability to conduct electricity when molten indicates that the substance can dissociate into ions, allowing for the flow of electric current. Ionic compounds typically exhibit this behavior when in a molten state or dissolved in a suitable solvent.