Problem

Problem

Three substances, X, Y and Z have the physical properties shown.
SubstanceXYZ
Melting point / °C74716102614
Boiling point / °C139022302850
Electrical conductivity of liquid statehighpoorhigh
Identify X, Y and Z. a. X: CaO, Y: NaBr, Z: SiO 2 b. X: CaO, Y: SiO 2, Z: NaBr c. X: NaBr, Y: CaO, Z: SiO 2 d. X: NaBr, Y: SiO 2, Z: CaO

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