Answer:
The answer is d. pyruvate
Explanation:
An oxidizing agent is the substance that gains electrons in a chemical reaction. At the end of the reaction it is reduced and its oxidation state increased.
A reducing agent is the substance that loses electrons in a chemical reaction. At the end of the reaction it is oxidized and its oxidation state decreased.
Pyruvate gains one electron, it is reduced from pyruvate to lactate; thus, pyruvate is the oxidizing agent.
NADH loses one electron, it is oxidized from NADH to NAD; thus, NADH is the reducing agent
Pyruvate is the oxidizing agent in the reaction.
An oxidizing agent is an element or a compound that gains electrons from another species of the reduction-oxidation reaction.
Pyruvate is an oxidizing agent as it acquires electrons in the reaction and gets reduced in the reaction resulting in an increased oxidation state. It gained an electron and gets reduced to lactate.
The substances that lose an electron in a redox reaction is called reducing agent. NADH is a reducing agent as it lost one electron and gets oxidized from NADH to [tex]\rm NAD^{+}[/tex].
Therefore, option d is an oxidizing agent.
Learn more about oxidizing and reducing agents here:
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