JAMB Chemistry 2021 Paper

Concept:Transition metal names include a Roman numeral showing the metal's oxidation state.Explanation:The carbonate ion is $\mathrm{CO}_3^{2-}$, which has a charge of $-2$.For the neutral compound $\mathrm{CuCO}_3$, copper must balance this $-2$ charge.Therefore, copper has an oxidation state of $+2$, written as Copper (II).So the correct chemical name is Copper (II) carbonate.This matches option B.Answer:B. Copper (II) carbonate