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Among the following reactions of hydrogen with halogens, the one that requires a catalyst is

1. H 2 + Br 2 → 2HBr
2. H 2 + Cl 2 → 2HCl
3. H 2 + F 2 → 2HF
4. H 2 + I 2 → 2HI

Correct answer: H 2 + I 2 → 2HI

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