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KCET2026ChemistryChemical Bonding and Molecular Structure

With respect to resonance structures of CO ₃²⁻ ion, which of the following statements are correct? (a) All C - O bonds in CO ₃²⁻ are equivalent (b) There are three resonance structures possible for CO ₃²⁻ ion (c) The position of carbon and oxygen should change in every resonance structure (d) The formal charge on carbon atom is -2

Options

  1. Aa, b and c
  2. Ba and b only
  3. Cb and d only
  4. Da, b and d

Correct answer

B. a and b only

Step-by-step solution

The carbonate ion, CO ₃²⁻ , has three equivalent resonance structures where the double bond is shared among the three oxygen atoms. Due to resonance, all three C - O bonds have partial double bond character and are equivalent in length and strength. Thus, statement (a) is correct. There are exactly three equivalent resonance structures for the CO ₃²⁻ ion. Thus, statement (b) is correct. In resonance structures, the positions of the atoms must remain fixed; only the arrangement of electrons changes. Thus, statement

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