The first compound of the noble gasees was made in 1962. Barlett and Lohman had previously used the highly oxidizing compound platium hexaflouride to oxidize dioxygen.
`O_(2)+PtF_(6) to O_(2)^(+)[PtF_(6)]^(-)`
The first ionization energy for `O_(2) to O_(2)` is `1165kJ*mol^(-1)`, which is almost as the value of `1170kJ*mol^(-1)` for `Xe to Xe^(+)`. It was predicated that xenon should react with `PtF_(6)`. Experimental showed that when deep of red `PtF_(6)` vapour was mixed with an equal volume of Xe the gases combined immediately at room temperature to produce a solid.
`Xe+PtF_(6) to Xe[PtF_(6)]`
Q. Noble gases are water insoluble, however decrease their insolubility in water decrease down the group due to increase in :

Options

A. dipole-dipole attraction
B. dipole-induced dipoles
C. instantaneous dipole-induced dipole attraction
D. None of these

Answer

To solve the question regarding the decrease in the insolubility of noble gases in water as we move down the group, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Nature of Noble Gases and Water:**
- Noble gases are non-polar molecules, while water is a polar molecule. This difference in polarity affects how they interact with each other.

**Hint:** Recall the definitions of polar and non-polar molecules and their interactions.

2. **Identifying the Interaction:**
- When a non-polar noble gas is introduced to polar water, a dipole-induced dipole interaction occurs. The polar water molecules can induce a temporary dipole in the noble gas atoms.

**Hint:** Consider how polar molecules can influence non-polar molecules.

3. **Analyzing the Trend Down the Group:**
- As we move down the group of noble gases (from Helium to Radon), the molecular mass of the noble gases increases. This increase in molecular mass enhances the strength of the dipole-induced dipole interactions.

**Hint:** Think about how molecular mass relates to the strength of interactions between molecules.

4. **Conclusion on Solubility:**
- Due to the increased molecular mass and the resulting stronger dipole-induced dipole interactions, the solubility of noble gases in water increases as we move down the group. Therefore, the decrease in their insolubility is attributed to the increase in dipole-induced dipole interactions.

**Hint:** Relate the concept of solubility to the strength of interactions between solute and solvent.

### Final Answer:
The decrease in the insolubility of noble gases in water down the group is due to an increase in dipole-induced dipole interactions.