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← ScienceWhich consequence results when unimolecular reaction Vessel volume decreases?
A)Increased collision frequency between molecules
B)Reduced concentration of activated complexes
C)Effective rate constant becomes pressure-dependent✓
D)The half-life becomes directly proportional pressure
💡 Explanation
Decreasing reaction vessel leads to increased pressure and a transition from first-order to second-order kinetics; the **Lindemann mechanism** describes this since the effective rate constant is no longer independent of pressure, therefore it pressure dependent, rather than remaining first-order for lower-pressure condition.
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