Which of the following statements are correct about \( \mathrm{CO}_{3}^{2-} \) ? (A) The hybridi...

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Which of the following statements are correct about \( \mathrm{CO}_{3}^{2-} \) ?
(A) The hybridisation of central atom is \( s p^{3} \)
(B) Its resonance structure has one \( \mathrm{C}-\mathrm{O} \) single bond and two \( \mathrm{C}=\mathrm{O} \) double bonds
(C) The average formal charge on each oxygen atom is \( 0.67 \) units
(D) All \( \mathrm{C}-\mathrm{O} \) bond length are equal
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