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For the reaction \( \mathrm{H}_{2}(\mathrm{~g})+\mathrm{Br}_{2}(\mathrm{~g}) \rightarrow 2 \mathrm{HBr}(\mathrm{g}) \) the
P experiment data suggested that \( \mathrm{r}=\mathrm{k}\left[\mathrm{H}_{2}\right]\left[\mathrm{Br}_{2}\right]^{1 / 2} \)

W The molecularity and order of the reaction are respectively :
(1) \( 2,3 / 2 \)
(2) \( 3 / 2,3 / 2 \)
(3) Not defined, \( 3 / 2 \)
(4) \( 1,1 / 2 \)
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