Question

Which of the following is not a name of a valid chemical formula? hydrobromic acid ammonium nitrate aluminum (III) chloride copper (II) oxide

Answer 1

Answer is: aluminum (III) chloride.

Aluminum (III) chloride is not valid, because aluminium has oxidation number +3 in compounds, so (III) is excess in this name.

The right name for AlCl₃ is aluminium chloride.

Hydrobromic acid, ammonium nitrate (NH₄NO₃) and copper(II) oxide are correct names.