Answer: The species oxidized is [tex]I^-[/tex].
The species reduced is [tex]Hg^{2+}[/tex]
The oxidizing agent is [tex]Hg^{2+}[/tex]
The reducing agent is [tex]I^-[/tex]
Explanation:
Oxidation reaction is defined as the reaction in which a substance looses its electrons. The oxidation state of the substance increases.
Reduction reaction is defined as the reaction in which a substance gains electrons. The oxidation state of the substance gets reduced.
[tex]Hg^{2+}+2I^-\rightarrow Hg+I_2[/tex]
On reactant side:
Oxidation state of mercury = +2
Oxidation state of iodine = -1
On product side:
Oxidation state of mercury = 0
Oxidation state of iodine = 0
The oxidation state of mercury reduces from +2 to 0, it is getting reduced. Thus, it is getting reduced and acts as oxidizing agent.
The oxidation state of iodine increases from -1 to 0. Thus, it is getting oxidized and acts as reducing agent .