In the following questions two or more options may be correct.

Which of the following statements are correct about CO₃^2- ?

The hybridization of Carbon atom is sp² in carbonate ion.

Carbonate ion is present in the form of a resonating structure. These structures are equivalenting to nature. Resonance all 3 C-O bonds get a double character in one of the resonating structures.

Thus, all the bonds are equivalent and have equal length.