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How does dihydrogen react with halogens ...

How does dihydrogen react with halogens ?

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Dihydrogen react with halogens to from hydrogen halides to form hydrogen halides.
`H_(2)(g)+X_(2)to2HX(g)(X=F,C1,BrI)`
Order of reactive is `F_(2)gtC1gtBrgtI_(2)`
Fluorine reacts in dark, chlorine reacts in presence of diffused sunlight while Br and I reacts in presence of catalyst.
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