When triatomic gas `X_(3)` reacts with an excess of potassium iodide solution buffered with a borate buffer `(pH=9.2)` diatomix product `Y_(2)` is liberated which can be titrated agains a standard solution of sodium thiosulphate. This is a quantitative method for the estimation of `X_(3)` gas in the mxiture of `X_(3)` and `X_(2)` of some atom `X`.
Select the incorrect statement?

Options

A. `Y_(2)` produces blue colour wilth starch
B. `X_(2)` is thermodynamically stable as compared to `X_(3)`
C. `Y_(2)` can produce brown colouration due to the presence of excess `KI`
D. `X_(2)` and `X_(3)` both are colourless and odourless gases

Explanation

To solve the question regarding the incorrect statement about the reaction of triatomic gas \( X_3 \) with potassium iodide solution buffered with a borate buffer at pH 9.2, we will analyze the information given step by step.

### Step-by-Step Solution:

1. **Understanding the Reaction**:
- The triatomic gas \( X_3 \) reacts with potassium iodide (KI) in a buffered solution. The buffer maintains a pH of 9.2, which is slightly alkaline.
- In this reaction, a diatomic product \( Y_2 \) is formed, which can be titrated against a standard solution of sodium thiosulfate (Na2S2O3).

2. **Identifying the Products**:
- The diatomic product \( Y_2 \) is likely a halogen or a similar species that can be formed from the reaction of \( X_3 \) with iodide ions.
- The fact that \( Y_2 \) can be titrated with sodium thiosulfate suggests that it is an oxidizing agent, possibly iodine (I2).

3. **Quantitative Estimation**:
- The titration method indicates that the amount of \( Y_2 \) produced is directly related to the amount of \( X_3 \) present in the mixture.
- This means that the reaction is quantitative, allowing for the estimation of \( X_3 \) based on the volume of sodium thiosulfate used in the titration.

4. **Analyzing the Statements**:
- We need to evaluate the statements provided in the question to identify which one is incorrect.
- The statements would typically include information about the nature of \( X_3 \), the reaction conditions, the products formed, and the titration process.

5. **Selecting the Incorrect Statement**:
- Without the specific statements provided in the question, we cannot definitively identify the incorrect one. However, we can infer that any statement that contradicts the established facts about the reaction, such as the nature of \( Y_2 \) or the role of the buffer, would be incorrect.

### Conclusion:
Based on the analysis, the incorrect statement would likely be one that misrepresents the nature of the products, the reaction conditions, or the method of estimation.