In the reaction : `CO_2 + OH^(-) to HCO_3^(-) ,CO_2` acts as a Lewis acid.

Answer

To determine whether CO₂ acts as a Lewis acid in the reaction with OH⁻ to form HCO₃⁻, we can analyze the reaction step by step.

### Step-by-Step Solution:

1. **Identify the Reactants and Products**:
- The reactants are carbon dioxide (CO₂) and hydroxide ion (OH⁻).
- The product formed is bicarbonate ion (HCO₃⁻).

2. **Understand Lewis Acids and Bases**:
- A Lewis acid is defined as a substance that can accept an electron pair.
- A Lewis base is a substance that can donate an electron pair.

3. **Analyze the Structure of CO₂**:
- CO₂ has a linear structure with a carbon atom double-bonded to two oxygen atoms (O=C=O).
- The carbon atom in CO₂ has a partial positive charge due to the electronegativity of oxygen, making it electron-deficient.

4. **Examine the Hydroxide Ion (OH⁻)**:
- The hydroxide ion (OH⁻) has a negative charge and possesses a lone pair of electrons on the oxygen atom, making it a good electron donor.

5. **Reaction Mechanism**:
- In the reaction, the hydroxide ion (OH⁻) donates its lone pair of electrons to the carbon atom of CO₂.
- This results in the formation of a new bond between the oxygen of OH⁻ and the carbon of CO₂, leading to the formation of bicarbonate ion (HCO₃⁻).

6. **Conclusion**:
- Since CO₂ accepts an electron pair from OH⁻, it acts as a Lewis acid in this reaction.
- Therefore, the statement that "CO₂ acts as a Lewis acid" is **True**.

### Final Answer:
CO₂ acts as a Lewis acid in the reaction with OH⁻ to form HCO₃⁻.

---