The degree of dissociation of `PCl_(5)` decreases with increase in pressure.

Explanation

To solve the question regarding the degree of dissociation of \( PCl_5 \) and its relationship with pressure, we can follow these steps:

### Step 1: Write the Dissociation Reaction
The dissociation of phosphorus pentachloride (\( PCl_5 \)) can be represented as:
\[ PCl_5 (g) \rightleftharpoons PCl_3 (g) + Cl_2 (g) \]
This reaction shows that one mole of \( PCl_5 \) dissociates into one mole of \( PCl_3 \) and one mole of \( Cl_2 \).
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