Question

what is the correct iupac name for the ionic compound with the chemical formula fecl₂?
iron(iii) chloride
iron(i) chloride
iron(ii) chloride
iron chloride
the iupac name for the ionic compound with the chemical formula copper(i) oxide is cu₂o
false
true

Explanation:

1. In $FeCl_2$, iron has a +2 oxidation state. The correct IUPAC name is iron(II) chloride. Iron(III) chloride is $FeCl_3$, iron(I) is not the oxidation - state in this compound, and just "iron chloride" is ambiguous without indicating the oxidation state.
2. For copper(I) oxide, the chemical formula is $Cu_2O$ because copper has a +1 oxidation state and oxygen has a -2 oxidation state. To balance the charges, two copper(I) ions are needed for one oxygen ion.

Answer:

1. iron(II) chloride
2. True