Question
All the $\text{C}-\text{O}$ bonds in carbonate ion $\Big(\text{CO}^{2-}_3\Big)$ are equal in length. Explain.
✓
Answer
To explain the reason of equal in length of $\text{C}-\text{O}$ bonds, it should keep in mind about the resonance. As a result of resonance, the bond length in a molecule become equal. Carbonate ion $\Big(\text{CO}^{2-}_3\Big)=3$ bond pair + 1 lone pair.
⇒ Trigonal planar
Due to resonance all $\text{C}-\text{O}$ bond length are equal.
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