Discussion
Assertion (A): The equilibrium constant depends on temperature but not on pressure.
Reason (R): It is defined through the standard Gibbs energy change, which is evaluated at a fixed standard pressure.
Answer: A
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the cause. \( K \) is defined by \( \Delta G^{\circ} = -RT\ln K \), and the standard state is at a fixed pressure, so the standard Gibbs energy - and therefore \( K \) - depends only on temperature. Pressure certainly shifts the equilibrium *composition*, but it does so by changing the mole fractions that must satisfy an unchanged \( K \).
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