Question

In which of the following reactions, the concentration of reactant is equal to the concentration of product at equilibrium? ($K=$ equilibrium constant)

• A. $A\rightleftharpoons B;K=0.01$
• B. $R\rightleftharpoons P;K=1$
• C. $X\rightleftharpoons Y;K=10$
• D. $L\rightleftharpoons J;K=0.025$

Answer 1

The correct option is B $R\rightleftharpoons P;K=1$

Let take [R]=1 M

$R\rightleftharpoons P$

Initial 1 0

Equilibrium 1-0.5 0.5

$K_C=\frac{0.5}{0.5}=1$