Question

Which lists all of the substances that appear in equilibrium constant expressions?

Answer 1

Below are the choices that can be found from other sources:

pure gas and pure liquid
pure gas and aqueous solution
pure solid and pure liquid
aqueous solution and pure liquid

the answer is it could be pure solid and pure liquid but not sure

Answer 2

Answer: pure gas and aqueous solutions

Explanation: Got 100% on the ED 2020 quiz