Question

26. Provide the formula for each of the following binary ionic compounds. (a) copper(II) sulfide (b) iron(III) phosphide (c) mercury(I) iodide (d) lead(II) oxide

Answer 1

a)

Sulfide ion is S^2-

Cation is Cu²⁺

So, the compound is CuS

Answer: CuS

b)

Phosphate ion is PO₄^3-

Cation is Pb³⁺

So, the compound is PbPO₄

Answer: PbPO₄

c)

Iodide ion is I^-

Cation is Hg⁺

So, the compound is HgI

Answer: HgI

d)

oxide ion is O^2-

Cation is Pb²⁺

So, the compound is PbO

Answer: PbO