Question

In the reaction H₂(g) + Br₂(g) --> 2HBr(g) which substance undergoes oxidation?
(A) H₂
(B) Br₂
(C) HBr
(D) H₂ and Br₂

Answer 1

H2

Explanation:

elemental form have oxidation state zero

Both h2 and Br2 have zero oxidation state. In HBr or H+ Br-, oxidation number of hydrogen is +1 and bromine -1.

thus hydrogen change its oxidation state from 0 to +1 loss of one electron (oxidation)