Which equation does not fit the definition of oxidation?

1. Na ® Na+ + e-

2. C2H6 ® H2 + C2H4

3. C + O2 ® CO2

4. Ag+ + e- ® Ag

Can some one help. I do not know which one. I am working on a practice test and there are no answers in the back of the book.

1 answer

The correct answer is in the definition. Oxidation is the loss of electrons.
For example, #1, the equation shows the loss of 1e to become the + ion. Therefore, Na is oxidized.
#2 can't be the answer; that is an equation and equations (if redox equations) must have both.
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