A reaction in which an element's oxidation number decreases shows that it has undergone:
AReflection
BRefraction
CReduction
DOxidation
Answer & Solution
Correct answer: C. Reduction
1. Gaining electrons lowers the oxidation number.
2. That change has a standard name.
3. It is reduction.
_Source: OpenStax Chemistry 2e, Chapter 17, Electrochemistry._
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