Which among the following statements is incorrect?

Options

A. 1. `XeF_(4) and SbF_(5)` combine to form salt.
B. 2. He and Ne do not form clathrates.
C. 3. He has highest boiling point in its group.
D. 4. He diffuses through rubber and polyvinyl chloride.

Answer

To determine which statement is incorrect among the given options, let's analyze each statement one by one.

### Step 1: Analyze the First Statement
**Statement 1:** "XeF4 and SbF5 combine to form salt."

- **Explanation:** When xenon tetrafluoride (XeF4) reacts with antimony pentafluoride (SbF5), it forms a salt-like compound, specifically XeF3+ and SbF6-. This indicates that the statement is correct.

### Step 2: Analyze the Second Statement
**Statement 2:** "Helium and neon do not form clathrates."

- **Explanation:** Clathrates are compounds where a host structure traps guest molecules. Helium and neon are noble gases and have very low reactivity. They do not form clathrates because they do not easily bond with other elements to create the necessary cage-like structures. Thus, this statement is also correct.

### Step 3: Analyze the Third Statement
**Statement 3:** "Helium has the highest boiling point in its group."

- **Explanation:** Helium is in Group 18 (noble gases), and it is the lightest element in this group. As we move down the group (from helium to radon), the atomic mass increases, leading to an increase in boiling points. Therefore, helium does not have the highest boiling point in its group; in fact, it has the lowest boiling point among the noble gases. This statement is incorrect.

### Conclusion
Based on the analysis, the incorrect statement is:

**The third statement: "Helium has the highest boiling point in its group."**

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