Which of the following statements is not correct?

Options

A. Helium has the lowest boiling point among the noble gases
B. Argon is used in electric bulbs
C. Krypton is obtained during radioactive disintegration
D. `Xe" forms "XeF_(6).`

Explanation

To determine which statement is not correct among the options provided, let's analyze each statement step by step.

### Step 1: Analyze Statement 1
**Statement:** Helium has the lowest boiling point among the noble gases.

**Explanation:**
- Helium (He) is the lightest noble gas with the lowest molecular weight.
- The boiling points of noble gases increase with increasing molecular weight due to the Van der Waals forces.
- Since helium has the lowest molecular weight, it indeed has the lowest boiling point among the noble gases.

**Conclusion:** This statement is correct.

### Step 2: Analyze Statement 2
**Statement:** Argon is used in electric bulbs.

**Explanation:**
- Argon (Ar) is commonly used in electric bulbs to prevent the filament from oxidizing and prolong its life.
- It is an inert gas and does not react with the materials in the bulb.

**Conclusion:** This statement is correct.

### Step 3: Analyze Statement 3
**Statement:** Krypton is obtained during radioactive disintegration.

**Explanation:**
- Krypton (Kr) is a noble gas that is found in the atmosphere and is not produced during radioactive disintegration.
- Radon (Rn), another noble gas, is the one that is produced during radioactive decay.

**Conclusion:** This statement is incorrect.

### Step 4: Analyze Statement 4
**Statement:** Xenon forms XeF6.

**Explanation:**
- Xenon (Xe) is known to form various fluorides, including XeF6.
- It can also form XeF2, XeF4, and other compounds with fluorine and oxygen.

**Conclusion:** This statement is correct.

### Final Conclusion
After analyzing all statements, we find that the incorrect statement is **Statement 3**: "Krypton is obtained during radioactive disintegration." The correct answer is that this statement is not correct.

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