A gas X when passed through blue litmus solution turns it to red. Another gas Y when passed through either blue litmus or red litmus does not change the colour of the litmus. Identify the true statement regarding X and Y.

Options

A. X is basic while Y is neutral
B. Y is neutral while X is acidic
C. Y is basic while X is acidic
D. Y is acidic while X is neutral

Explanation

To solve the problem, we need to analyze the behavior of the two gases, X and Y, with respect to litmus paper.

### Step-by-step Solution:

1. **Understanding Gas X**:
- When gas X is passed through blue litmus solution, it turns the blue litmus red.
- This indicates that gas X is acidic in nature because acids turn blue litmus paper red.

2. **Understanding Gas Y**:
- Gas Y, when passed through either blue litmus or red litmus, does not change the color of the litmus.
- This suggests that gas Y is neutral; it does not have acidic or basic properties.

3. **Identifying the True Statement**:
- Based on the behavior of the gases, we can conclude:
- Gas X is an acid (since it turns blue litmus red).
- Gas Y is neutral (since it does not affect the color of either blue or red litmus).
- Therefore, the true statement regarding gases X and Y is that gas X is acidic and gas Y is neutral.

### Final Conclusion:
- Gas X is acidic, and gas Y is neutral.