Answer:
Polyatomic ion is potassium nitrate is nitrate ion .
Explanation:
Polyatomic ions are those species of ions with more than one atom of an same element or different elements .
For example : [tex]SO_4^{2-}[/tex] sulfate ions, [tex]HCO_3^{-}[/tex] bicarbonate ion etc.
In the given compound , [tex]KNO_3[/tex]
Cation is potassium ion = [tex]K^+[/tex]
Anion is nitrate ion = [tex]NO_3^{-}[/tex]
Polyatomic ion is potassium nitrate is nitrate ion .This is because nitrate ions has single atom of nitrogen and three atoms of oxygen along with charge of single negative unit.
