Respuesta :
Redox reaction is a type of chemical reaction in which the electrons are transferred between species. The chloride ion is the reducing agent in the reaction.
What is a reducing agent?
A reducing agent in a reduction-oxidation reaction is the chemical species that donates or loses electrons to another species and is present in a lower oxidation state.
The reduction-oxidation reaction is shown as,
[tex]\rm MnO_{2} + 4H^{+} + 2Cl^{-} \rightarrow Mn^{2+} + 2H_{2}O + Cl_{2}[/tex]
In this reaction chloride ions lost two-electron and their oxidation number changed to zero. Hence, the chloride ion is the reducing agent.
Here, manganese is an oxidizing agent as the oxidation number changes from +4 to +2 and gains electrons.
Therefore, option A. chloride ion is the reducing agent.
Learn more about reducing agents here:
https://brainly.com/question/8284021
