Cu^+ - correct answer Copper (I) ion/ cuprous ion
Cu^2+ - correct answer Copper (II) ion/ cupric ion
Fe^2+ - correct answer Iron (II) ion/ ferrous ion
Fe^3+ - correct answer Iron (III) ion/ ferric ion
Hg^2+ - correct answer Mercury (II) ion/ mercuric ion
Sn^2+ - correct answer Tin (II) ion/ stannous ion
Sn4^+ - correct answer Tin (IV) ion/ stannic ion
NH4^+ - correct answer ammonium ion
OH^- - correct answer hydroxide ion
NO3^- - correct answer nitrate ion
CH3COO^- - correct answer acetate
ClO4^- - correct answer perchlorate
MnO4^- - correct answer permanganate