Which of the following statements are correct about `CO_(3)^(2-)`?

Options

A. The hybridisation of central atom in `sp^(3)`
B. Its resonance structure has one C-O single bond and two C=O double bonds
C. The average formal charge on each oxygen atom is `0.67` units
D. All `C-O` bond lengths are equal.

Answer

C, D

Explanation

(c,d) The hybridisation of central atom in `CO_(3)^(2-)` is `sp^(2)`. Hence, (a) is wrong.

Due to resonance all C-O bond lengths are equal.
Formal charge on each O-atom = `("total charge")/("Number of O-atoms")=-2/3=-0.67` units
All C-O bond lengths are equal as mentioned above.