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Consider the following reactions in whic...

Consider the following reactions in which all the reactants and the products are in gaseous state.
`2PQ hArr P_(2)=Q_(2), K_(1)=2.5xx10^(5)`
`PQ +1//2 R_(2) hArr PQR, K_92) =5xx10^(-3)`
The value of `K_(2)` for the equilibrium
`1//2P_(2)+1//2Q_(2) +1//2R_(2) hArr PQR,` is

A

`2.5 xx10^-3`

B

`2.5 xx10^3`

C

`1.0xx10^-5`

D

`5xx10^3`

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