For the reaction : <br> $CH_4(g)+2O_2(g)\rightleftharpoons CO_2(g)+2H_2O(l)$ <br> $\Delta H_{r}=-170.8KJ mol^{-1}$ <br> Which of the following statements is not true:-

Question

( A ) The reaction is exothermic
( B ) Addition of $CH_4(g) or O_2(g)$ at equilibrium will cause a shift to the right
( C ) At equilibrium, the concentrations of $CO_2(g) and H_2O(l)$ are not equal
( D ) The equilibrium constant for the reaction is given by$K_{P}=\frac{[CO_2]}{[CH_4][O_2]}$