For the reaction
`CH_(4)(g)+2O_(2)(g)hArr CO_(2)(g)+2H_(2)O(I)`
`Delta_(r)H= - 170.8kJ mol^(-1)`
Which of the following statements is not true ?

Options

A. Addition of `CH_(4)(g)` or `O_(2)(g)` at equilibrium will cause a shift to the right.
B. The reaction is exothermic.
C. At equilibrium, the concentrations of `CO_(2)(g)` and `H_(2)O` are not equal.
D. The equilibrium constant for the reaction is given by `K_(p)= ([CO_(2)])/([CH_(4)][O_(2)])`

Answer

D

Explanation

`K_(P)` is referred to as pressure equilibrium constant. Thus, according to the law of chemical equilibrium,
`K_(p)= (P_(CO_(2)))/(P_(CH_(4))P_(O_(2))^(2))`