Question

what is the correct name for the following compound: (nh4)3po4
ammonium phosphide
nitrogen hydrogen phosphate
ammonium (iii) phosphate
ammonium phosphate

Explanation:

The compound contains ammonium ion ($NH_4^+$) and phosphate ion ($PO_4^{3 -}$). When naming ionic compounds, we name the cation first (ammonium) and then the anion (phosphate). There is no need for Roman numerals as ammonium is a poly - atomic cation with a fixed charge and phosphide would be $P^{3 -}$ not $PO_4^{3 -}$.

Answer:

D. Ammonium Phosphate