The equilibrium constant for the decomposition of water `H_2O(g) hArr H_2(g)+1/2O_2(g)` is given by : (`alpha`=degree of dissociation of `H_2O` (g) p=Total equilibrium pressure)

Options

A. `K_p=(a^2p^(1//2))/((1+alpha)(2-alpha)^(1//2)`
B. `K_p=(alpha^(3//2)p^(1//2))/((1-alpha)(2+alpha)^(1//2))`
C. `K_p=(alpha^3p^(1//2))/sqrt2`
D. `K_p=(alpha^3p^(3//2))/((1-alpha)(2+alpha)^(1//2))`

Answer

B