1.

From the following reaction of H_(2) and X_(2) ,in which reaction catalyst is necessary?

Answer»

`H_(2)+Br_(2)to2HBr`<BR>`H_(2)+I_(2)to2HI`
`H_(2)+Cl_(2)to2HCl`
`H_(2)+F_(2)to2HF`

SOLUTION :The REACTIVITY decreases from up to down because the reactivity of `I_(2)` is LESS,the catalysis is necessary.


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