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N(2)O(3) is an unstable oxide of nitroge...

`N_(2)O_(3)` is an unstable oxide of nitrogen and it decomposes into NO (g) and `NO_(2)(g)`where `NO_(2)(g)` is further dimerise dimerise into `N_(2)O_(4)` as
`N_(2)O_(3)(g)hArrNO_(2)(g)+NO(g)" ",K_(p_(1)=2.5` bar
`2NO_(2)(g)hArrN_(2)O_(4)(g)" ": K_(P2)`
A flask is initially filled with pure `N_(2)O_(3)(g)` having pressure `2` bar and equilibria was established.
At equilibrium partial pressure of NO (g) was found to be `1.5` bar.
The value of `K_(P2)` is

A

`0.16 "bar"^(-1)`

B

`0.32 "bar"^(-1)`

C

`0.48 "bar"^(-1)`

D

`0.64 "bar"^(-1)`

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