Assertion: As per carbonic acid exchange theory of mineral salt absorption, `CO_(2)` released during respiration of roots forms 'H_(2)CO_(3) 'when dissolved in soil water Reason:`H_(2)CO_(3)` dissociates into `H^(+)` and `HCO_(3)` ions, where `H^(+)` ions exchange with anions adsorbed on clay particles.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion
B. if both assertion and reason are true but reason is not the correct explanation of assertion
C. if assertion is true but reason is false
D. if both assertion and reason are false

Explanation

To solve the question regarding the assertion and reason related to the carbonic acid exchange theory of mineral salt absorption, we can break it down into the following steps:

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that according to the carbonic acid exchange theory, CO2 released during root respiration forms H2CO3 when it dissolves in soil water.
- **Analysis**: This is true because plants release CO2 during respiration, which can combine with water in the soil to form carbonic acid (H2CO3).

2. **Understanding the Reason**:
- The reason provided states that H2CO3 dissociates into H+ and HCO3- ions, and that H+ ions exchange with anions adsorbed on clay particles.
- **Analysis**: While it is true that H2CO3 dissociates into H+ and HCO3- ions, the statement about H+ ions exchanging with anions is incorrect. H+ ions actually exchange with cations on clay particles, not anions.

3. **Conclusion**:
- Since the assertion is true and the reason is false, we can conclude that the correct option is C: "Assertion is true, but reason is false."

### Final Answer:
- The correct option is **C**: Assertion is true, but reason is false.