Question

Which of the following reactions involves oxidation-reduction

• A.
• B.
• C.
• D.

Answer 1

The correct option is C

Observe this reaction:

In the elemental state, both $H_2$ and $B{r}_2$ have zero Oxidation numbers. In $HBr$ - the hydrogen atom has +1 oxidation state whereas the bromine atom has -1 oxidation state.