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

Options

A. The hybridisation of central atom is `sp^(3)`
B. Its resonance structrue has cone C-O single
bond and two C= O double bonds
C. The average formal charge on each oxygen atom in 0 . 67 units
D. All C-O bond length are equal .

Answer

C, D

Explanation

Hybridisation involved is `sp^(2)` . Hence ,(a) is wrong .
Resonance structure has both C-O bond of equal length . Hence , (b) is wrong.
formal charge on each O-atom = `(" Total charge ")/(" No, of O-atoms " ) = (-2)/(3) = -0.67 ` units
All C-O bond lengths are equal as mentioned above .