B ⇌C+ D Initial 1 1 0 0 remaining at equilibrium 0.4 0.4 0.6 0.6 \[K=\frac{[C]\,\,[D]}{[A]\,\,[B]}=\frac{0.6\times 0.6}{0.4\times 0.4}=\frac{36}{16}=2.25\].