What compounds in the liquid phase can be considered an electrolyte carbon dioxide sodium chloride distilled water hydrogen peroxide oxidized copper?

Answer 1

An electrolyte is any substance containing free ions that behaves as an electrically conductive medium.

• Distilled water ionizes only slightly (Keq = 1x10-7) but it will pass a negligible current.
• Liquid carbon dioxide ionizes even more poorly than water.
• Molten sodium chloride will pass a current nicely because the ions are quite free to move. Once the sodium chloride melts, all of the ions are free to dissociate.
  
• Oxidized copper--the oxide layer will form dross that will float on the liquid copper and the de-localized electron cloud of the metal will pass an electric current very well but you can't consider it to be an electrolyte because it is a metal. If the material had been called copper (I) or copper (II) oxide instead of oxidized copper, that would indicate a pure ionic substance. You could expect that oxides of copper would dissociate into free ions when molten but, since this is an ambiguous description it can only be correct if you argue the point.
  
• Hydrogen peroxide ionizes the same as water.

The best single choice is NaCl.
If more than one can be selected, go with: H2O, H2O2 and NaCl.

Answer 2

sodium chloride