Engineering
Chemistry
The Halogen Family and Properties
Question

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

H2 + F2 → 2HF

H2 + Cl2 → 2HCl

H2 + Br2 → 2HBr

H2 + I2 → 2HI

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Solution

First reaction will be requiring a catalyst among halogens oxidizing power decrease down the group.