In the following system, PCl₅(g) leftharpoons PCl₃(g) + Cl₂(g) at equilibrium, upon addition of xenon gas at constant T & p, the concentration of:

Solution & Explanation

Related Formula

Addition of inert gas at constant pressure increases total volume V, shifting equilibrium toward the side with more gaseous moles (Δ ng > 0).

Core Logic

For PCl₅(g) leftharpoons PCl₃(g) + Cl₂(g), Δ ng = 1 + 1 - 1 = +1 > 0.

Addition of an inert gas (xenon) at constant temperature and total pressure increases system volume. To counteract this change, equilibrium shifts in the forward direction (towards greater number of gaseous moles), resulting in an increase in the moles/amount of PCl₃ and Cl₂ formed.

Step 1: Final Conclusion

The forward shift increases the amount of products, thus the amount/formation of PCl₃ increases.

Pattern Recognition

Inert gas added at CONSTANT PRESSURE arrow Shifts equilibrium to larger gaseous moles side. Δ ng > 0 Forward shift Product concentrations/moles increase.

Chapter Mix

Class 11 Chemistry: Chemical Equilibrium

Reference Study Guides

Chemical Equilibrium

More Chemical Equilibrium Previous-Year Questions — Page 8

Q62 jee_main_2024_31_jan_morning Equilibrium Constant
For the given reaction, choose the correct expression of KC from the following :- Fe(aq)³⁺ + SCN(aq)⁻ leftharpoons (FeSCN)(aq)²⁺
  • A. KC = [FeSCN²⁺][Fe³⁺][SCN⁻]
  • B. KC = [Fe³⁺][SCN⁻][FeSCN²⁺]
  • C. KC = [FeSCN²⁺][Fe³⁺]²[SCN⁻]²
  • D. KC = [FeSCN²⁺]²[Fe³⁺][SCN⁻]

Solution

Related Formula
KC = [Products][Reactants]
Core Logic
KC = Products ion conc.Reactants ion conc. KC = [FeSCN²⁺][Fe³⁺][SCN⁻]
Chapter Mix

Class 11 Chemistry: Equilibrium

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