A(g)+2B(g)⇌2C(g)+D(g)  was studied using an initial concentration of B  which was 1.5 times that of A. But the equillibrium concentration of A and B were found to be equal. Then KC  for the equillibrium is

A+           2B                   ⇌                  2C+D 1                    1.5                     0                       0 1−x           1.5−2x             2x               x 1−x=1.5−2x x=0.5 KC=1×0.50.5×0.5×0.5=4