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For an elementary gaseous phase reaction...

For an elementary gaseous phase reaction :
`2NO+O_2 hArr 2NO_2` at `27^@C`
Rate of the forward reaction is given by rate `=2xx10^(3)[NO]^2 [O_2]` and rate of reverse reaction at is given by rate `=20[NO_2]^2`
Hence, equilibrium constant for reaction
`NO_2 hArr NO+1/2 "at"27^@C`

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