Some of the following gases are soluble in water due to formation of their ions :
`I:CO_(2), II:NH_(3), III:HCL, IV:CH_(4), V:H_(2)`
Water insoluble gases can be:

Options

A. I,IV,V
B. I,V
C. I,II,III
D. IV,V

Explanation

To determine which of the given gases are water insoluble, we need to analyze each gas based on its ability to form ions in water.

### Step-by-Step Solution:

1. **Identify the Gases**: The gases provided are:
- I: CO₂ (Carbon Dioxide)
- II: NH₃ (Ammonia)
- III: HCl (Hydrochloric Acid)
- IV: CH₄ (Methane)
- V: H₂ (Hydrogen)

2. **Analyze Solubility**:
- **CO₂**: When CO₂ is dissolved in water, it reacts to form carbonic acid (H₂CO₃), which can dissociate into bicarbonate (HCO₃⁻) and hydrogen ions (H⁺). Thus, CO₂ is soluble in water.
- **NH₃**: Ammonia is a polar molecule and when it dissolves in water, it forms ammonium ions (NH₄⁺) and hydroxide ions (OH⁻). Therefore, NH₃ is also soluble in water.
- **HCl**: Hydrochloric acid is a strong acid that completely dissociates in water to form hydrogen ions (H⁺) and chloride ions (Cl⁻). Hence, HCl is soluble in water.
- **CH₄**: Methane is a non-polar molecule and does not interact well with water. It does not form ions in water, making it insoluble.
- **H₂**: Hydrogen gas is also non-polar and does not dissolve in water to form ions. Therefore, H₂ is insoluble in water.

3. **Conclusion**: The gases that are insoluble in water are CH₄ (Methane) and H₂ (Hydrogen).

### Final Answer:
The water insoluble gases from the given options are CH₄ and H₂.

---