Final answer:
The correct names and formulas of the polyatomic ions are provided.
Step-by-step explanation:
The correct names and formulas of the polyatomic ions are:
a. carbonate: CO3²⁻; bicarbonate: HCO3⁻
b. nitrite: NO2⁻; nitrate: NO3⁻
c. sulfite: SO3²⁻; sulfate: SO4²⁻
d. chromate: CrO4²⁻; dichromate: Cr2O7²⁻