Q.For the equilibrium $A + B \rightleftharpoons C + D$, $\Delta G^{\circ}$ is $-4.606 \text{ kcal}$ at $500 \text{ K}$. The value of $\log K_{10}$ is: ($R = 2 \text{ cal K}^{-1} \text{ mol}^{-1}$)