`XY_(2)` dissociates `XY_(2)(g) hArr XY(g)+Y(g)`. When the initial pressure of `XY_(2)` is `600` mm Hg, the total equilibrium pressure is `800` mm Hg. Calculate `K` for the reaction assuming that the volume of the system remains unchanged.

Options

A. `50`
B. `100`
C. `166.6`
D. `400`

Answer

B

Explanation

`{:(,XY_(2),hArr ,XY,+,Y),("Initial pressure",600,,0,,0):}`
` p` is fall in pressure due to dissociation of `XY_(2)`
Eq. pressure `" "600-p" " p " "
p `
or `600-p+p+p=800`
or `p=800-600=200`
`:. K=(200xx200)/(400)=100`