Which of the following statements are correct about ${CO}_{3}^{2 -}$ ?

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The average formal charge on each oxygen atom is 0.67 units.

The hybridisation of central atom is ${sp}^{3}$

Its resonance structure has one $C - O$ single bond two $C = O$ double bonds.

All $C - O$ bond lengths are equal

answer is C, D.

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Detailed Solution

The centre atom's hybridization is ${sp}^{2}$ .
Three oxygen atoms have a net charge of 2, hence the formal charge is 0.67 units.
All bond lengths are equivalent in resonant structures since bonds are not fixed.

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