Select correct statements :

Options

A. Gases which have high value of Van der Waals constant `'a'` are easily liquefied
B. Easily liquenfiable gases are water soluble
C. Ions forming gases in a solvent are solutble in that solvent
D. Under same condition, `NH_(3)` has low solubility that that of `CO_(2)`

Answer

To solve the question of selecting the correct statements regarding gases and their properties, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement A**: "Gases which have high values of Van der Waals gas constant A are easily liquefied."
- **Analysis**: The Van der Waals constant A accounts for the attractive forces between gas molecules. A higher value of A indicates stronger intermolecular forces. Therefore, gases with high values of A are more easily liquefied due to these stronger intermolecular attractions.
- **Conclusion**: This statement is **correct**.

2. **Statement B**: "Easily liquefiable gases are water soluble."
- **Analysis**: Gases that can be easily liquefied typically have stronger intermolecular forces, which also enhances their solubility in polar solvents like water. Thus, gases that are easily liquefiable tend to be more soluble in water.
- **Conclusion**: This statement is **correct**.

3. **Statement C**: "Ions forming gas in the solvent are soluble in that solvent."
- **Analysis**: When a gas forms ions in a solvent, it indicates that the gas interacts favorably with the solvent, leading to solubility. For example, gases that ionize in water will dissolve well due to the attraction between the ions and the polar water molecules.
- **Conclusion**: This statement is **correct**.

4. **Statement D**: "Under the same conditions, NH3 has a low solubility than CO2."
- **Analysis**: Ammonia (NH3) is highly soluble in water due to hydrogen bonding, while carbon dioxide (CO2) has lower solubility compared to NH3 under the same conditions. Therefore, this statement is incorrect.
- **Conclusion**: This statement is **incorrect**.

### Final Answer:
The correct statements are **A, B, and C**.

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