Final answer:
b) Manganese(II) phosphate
The name of the compound Mn₃(PO₄)₂ is manganese(II) phosphate, which indicates the +2 oxidation state of manganese required to balance the phosphate ions in the formula.
Step-by-step explanation:
The correct name for the compound Mn₃(PO₄)₂ is manganese(II) phosphate.
This compound is made up of manganese (Mn) ions with a +2 charge and phosphate (PO₄) ions with a -3 charge. In order to balance the charges, we need three manganese ions to pair with two phosphate ions, resulting in a neutral compound.
Similar to how iron(II) ion and phosphate ion combine to form iron(II) phosphate as described in the reference, here the manganese ion also has a +2 charge, thus the number in parentheses in manganese(II) indicates the oxidation state of the manganese.