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Reaction between NO2 and F2 to give NO2F...

Reaction between `NO_2 and F_2` to give `NO_2F` takes place by the following mechanism
`NO_2 + F_2 overset("Slow")(rarr)NO_2F + F`
`NO_2 + F overset("Fast")(rarr)NO_2F`
`2NO_2 + F_2 to 2NO_2F`
write order of reaction.

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In complex reactions rate of rection depends upon slow step hence, rate expression for equation is
`r = K [ NO _(2) ] [ F _(2) ] ` order `= 1 + 1 =2 `
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