Final answer:
None of the given examples are correct chemical formulas.
Step-by-step explanation:
None of the given examples, H₂0, CO₂, C₁₂, H₂₂, and O₁₁, are correct chemical formulas. The correct representation of water is H₂O, carbon dioxide is CO₂, and others are not valid chemical formulas. It seems like there might be typing errors in the examples provided.