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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 overset(rightarrow)(leftarrow)P_2 + Q_2, K_1 = 2.5 xx 10^5, PQ + 1/2R_2overset(rightarrow)(leftarrow)PQR, K_2 = 5 xx 10^-3` The value of `K_3` for the equilibrium `1/2P_2+1/2O_2+1/2R_2overset(rightarrow)(leftarrow)PQR`is

A

`2.5xx10^-3`

B

`2.5xx10^3`

C

`1.0xx10^-5`

D

`5xx10^3`

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