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At a given temperature, the equilibrium ...

At a given temperature, the equilibrium constant for the reactions`NO(g) +1/2O_2 (g) hArr NO_2(g)` and `2NO_2 (g) hArr 2 NO (g) + O_2 (g) ` are `K_1` and `K_2` respectively.If `K_1` is `4 xx 10^(-3) `, then `K_2` will be

A

`8 xx 10^(-3)`

B

`16 xx 10^(-3)`

C

`6.25 xx 10^4`

D

`6.25 xx 10 ^ 6`

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