Reaction at anode is called________________?
Correct answer: A. oxidation
- A. oxidation
- B. reduction
- C. redox
- D. decomposition
Explanation
Oxidation always occurs at the anode, whether the cell is galvanic or electrolytic; the electrode signs may change, but this reaction rule does not. Reduction occurs at the cathode. The likely wrong choice is reduction, from memorising that the anode is negative in a galvanic cell without recalling the reaction occurring there.
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About Oxidation and Reduction
Oxidation involves loss of electrons, increase in oxidation number or addition of oxygen, while reduction involves electron gain, decrease in oxidation number or removal of oxygen. The topic covers oxidising and reducing agents, oxidation-number changes, redox equations and the distinction between oxidation at the anode and reduction at the cathode.
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