What is reduced in the reaction Mn + HCl → MnCl2 + H2? 1. chlorine in HCl 2. This is not a redox reaction. 3. manganese 4. hydrogen in HCl

Opion 4. The hydrogen in HCl reduce from proton to hydrogen gas (H at ground state)

Explanation:

The reaction is: Mn + HCl → MnCl₂ + H₂

Magnessium changed the oxidation state from 0 to + 2

It has increased, so it was oxidized

H changed the oxidation state from + 1 to 0

It has decreased, so it was reducted.