First slide

Hydrogen

Question

Which of the following reactions requires high temperature and catalyst?

Easy

A

H₂ + F₂ → 2HF
B

H₂ + Cl₂ → 2HCl
C

H₂ + Br₂ → 2HBr
D

H₂ + I₂ → 2HI

Solution

Reactivity order of halogens with hydrogens:
F₂ > Cl₂ > Br₂ > I₂
F₂ reacts with H₂ even in dark, but I₂ reacts with H₂ in the presence of "Pt" catalyst and at 713K
H₂ + X₂ → 2HX

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