C. Li has lost electrons in this oxidation-reduction reaction
Such a type of chemical reaction involving electron transfer between two species is known as oxidation-reduction or redox reaction.
Redox reaction is the oxidation number of a molecule, atom, or ion changes by gaining or losing an electron.
For this reaction:
On the reactant side:
Oxidation state of oxygen, cobalt, lithium = -2 ,+2, 0
While on the product side of reaction:
Oxidation state of cobalt, oxygen, lithium = 0, -2, +1
Here, an oxidation reaction takes place because the oxidation state of lithium is increased. While the oxidation state of cobalt is reducing, it is gaining electrons and undergoes a reduction reaction.
So, Option C (Li) is correct.
Learn more about the oxidation-reduction reaction:
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