In the decomposition of PCl5 represented by, PCl5 ⇌ PCl3 + Cl2, decrease in the pressure of the system will _____________ the degree of dissociation of PCl5?
Correct answer: B. Increase
- A. Decrease
- B. Increase
- C. Not alter
- D. None of these
Explanation
The reaction produces two moles of gas from one mole, so lowering pressure shifts equilibrium toward the side with more gas molecules. Therefore, PCl5 dissociates more and its degree of dissociation increases.
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