`XeF_(4)` exists as …. Under ordinary atmospheric conditions

Options

A. solid
B. liquid
C. gas
D. none of these

Answer

To answer the question about the state of \( \text{XeF}_4 \) under ordinary atmospheric conditions, we can break down the solution into several steps:

### Step 1: Understanding the Formation of \( \text{XeF}_4 \)
- \( \text{XeF}_4 \) is formed by the reaction of xenon (\( \text{Xe} \)) with fluorine (\( \text{F}_2 \)). The reaction occurs under specific conditions, namely high temperature and pressure.

### Step 2: Conditions for the Reaction
- The reaction is typically carried out in a nickel vessel at a temperature of 673 Kelvin and a pressure of 526 atmospheres. Under these conditions, xenon and fluorine react to form \( \text{XeF}_4 \).

### Step 3: State of \( \text{XeF}_4 \) at Ordinary Conditions
- Under ordinary atmospheric conditions (which are approximately 1 atmosphere of pressure and room temperature), \( \text{XeF}_4 \) exists as a solid. This is important to note because the conditions under which it is formed are much more extreme than normal atmospheric conditions.

### Step 4: Sublimation of \( \text{XeF}_4 \)
- If \( \text{XeF}_4 \) is heated to 120 degrees Celsius, it undergoes sublimation, transitioning from a solid state to a gaseous state. However, this is not the state under ordinary atmospheric conditions.

### Conclusion
- Therefore, under ordinary atmospheric conditions, \( \text{XeF}_4 \) exists as a **solid**.

### Final Answer
**\( \text{XeF}_4 \) exists as a solid under ordinary atmospheric conditions.**

---