Decrease in oxidation number is called__________________?
Correct answer: B. reduction
- A. oxidation
- B. reduction
- C. oxidation-reduction
- D. all of above represent same entity
Explanation
Reduction means a decrease in oxidation number because the species gains electrons or loses its formal positive character. Oxidation is an increase in oxidation number. The likely wrong choice is oxidation, caused by reversing the definitions of oxidation and reduction.
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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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