Which one of the following statements is correct about a reaction for which the equilibrium constant is independent of temperature?
Correct answer: B. The enthalpy change is zero
- A. The activation energies for both forward and reverse reactions are zero
- B. The enthalpy change is zero
- C. Its rate constants do not vary with temperature
- D. There are an equal number of moles of reactants and products in it
Explanation
Enthalpy change is the only factor that affects the equilibrium constant with respect to temperature. If the equilibrium constant is independent of temperature, then the enthalpy change of the reaction, ΔH, is zero. Hence, option b is correct.
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About Chemical Equilibrium
Reversible reactions reach dynamic equilibrium when forward and reverse rates become equal, and Le Chatelier's principle predicts the effect of changing concentration, pressure or temperature. The chapter also covers solubility product, the common ion effect, buffer action and the conditions used in Haber's process, with equilibrium shifts distinguished from changes in the equilibrium constant.
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