JEE Main Chemistry question
For the reaction A+B⇌C+D, the initial concentration of A and B are equal, but the equilibrium concentration of C is twice that of A. The equilibrium constant is:
Answer: (A)
Solution
Let x react. [C]=x=2(a−x) → x=2a/3, [A]=[B]=a/3, [C]=[D]=2a/3. Kc=(2a/3)²/(a/3)²=4.