Which among the following statements is/are correct ?

Options

A. `XeF_(4)` and `SbF_(5)` combine to form salt.
B. He and Ne do not form clathrate
C. He diffuses through rubber and polyvinyl chloride
D. He has lowest boiling point in its group.

Answer

To determine which among the given statements is/are correct, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement 1: "XeF4 and SbF5 combined to form a salt."**
- When xenon tetrafluoride (XeF4) reacts with antimony pentafluoride (SbF5), it forms an ionic product: XeF3^- and SbF6^+. This indicates that they do indeed combine to form a salt.
- **Conclusion:** This statement is correct.

2. **Statement 2: "Helium and neon do not form clathrate compounds."**
- Clathrate compounds are formed when guest molecules are trapped within a lattice of host molecules. The size of the cavities formed during the crystallization of quinol is larger than the size of helium and neon atoms. Hence, they cannot fit into these cavities to form clathrate compounds.
- **Conclusion:** This statement is correct.

3. **Statement 3: "Helium diffuses through rubber and polyvinyl chloride."**
- Helium is a small, inert gas that can diffuse through materials such as rubber and polyvinyl chloride (PVC). This is a well-known property of helium due to its small atomic size.
- **Conclusion:** This statement is correct.

4. **Statement 4: "Helium has the lowest boiling point in its group."**
- Helium is the first member of the noble gases (Group 18) and has the lowest boiling point among all the noble gases. As we move down the group, the size of the atoms increases, leading to stronger Van der Waals forces and higher boiling points for the heavier noble gases.
- **Conclusion:** This statement is correct.

### Final Conclusion:
All four statements are correct.