posted by Joe on .
Which statement about Kc is wrong?
A. Kc is always a constant
B. For some reactions, Kc increases with temperature increase
C. For some reactions, Kc decreases with temperature decrease
D. For some reactions, Kc changes when pressure is changed
A is incorrect. Kc stays constant for concentration and pressure changes but not for temperature changes.
B and C are correct.
D is incorrect. It is true that a system at equilibrium may be made to shift one way or another (for some reactions) by changing the pressure, BUT, Kc will not change.
I note that the question asks which statement (not statements) are wrong.