In the reaction H₂O + C → CO + H₂:
Correct answer: B. H₂O is the oxidizing agent
- A. H₂O is the reducing agent
- B. H₂O is the oxidizing agent
- C. Carbon is the oxidizing agent
- D. Oxidation-reduction does not occur
Explanation
In this reaction, the hydrogen in H₂O goes from a +1 oxidation state to 0 in H₂, meaning it has been reduced. The substance that gets reduced is the oxidizing agent. Carbon is oxidized from 0 to +2.
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Electrochemistry describes electron transfer through oxidation and reduction, identifies oxidizing and reducing agents, and applies oxidation numbers to balance redox equations. It also covers electrode potential and the standard hydrogen electrode, which provides the reference for comparing the reduction tendencies of other electrodes.
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