Given below are two statements: Statement I : A catalyst cannot alter the equilibrium constant (Kc) of the reaction, temperature remaining constant. Statement II : A homogenous catalyst can change the equilibrium composition of a system, temperature remaining constant. In the light of the above statements, choose the correct answer from the options given below:

Solution & Explanation

Related Formula
Kc = (kf)/(kb)

where kf and kb are forward and backward rate constants.

Core Logic

Statement I is true: A catalyst increases both forward (kf) and backward (kb) rate constants to the same extent by lowering the activation energy barrier. Therefore, Kc = kf / kb remains unchanged at constant temperature.

Statement II is false: A catalyst (whether homogeneous or heterogeneous) helps the reaction attain equilibrium faster but cannot alter the equilibrium composition or the position of equilibrium.

Step 1: Final Conclusion

Statement I is true but Statement II is false.

Pattern Recognition

Catalyst effect = Speeds up reaching equilibrium. Catalyst NEVER changes: Equilibrium Constant (Kc) or Equilibrium Concentrations/Composition.

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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