In a rigid contaienr `NH_(3)` is kept at a certain temperature where its presure is found to be `P_(1)`, if dissociated into `N_(2)` and `H_(2)` at these conditions pressure of mixture is found to be `P_(s)`. Find ratio of `P_(2)` of `P_(1)`.
A. 4
B. 2
C. `(1)/(2)`
D. `(1)/(4)`