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JAMB Chemistry 2019 Paper

Question : 25

Total: 80

Which of the following reactions is an oxidation process?

Solution:

Concept:

Oxidation is the loss of electrons, shown by an increase in oxidation number.

Explanation:

In option B, oxygen changes from

-2

\mathrm{O}^{2-}

0

\mathrm{O}_2

, meaning it loses electrons.

The correct oxidation half-equation is

2\mathrm{O}^{2-} \to \mathrm{O}_2 + 4e^-

Options A, C, and D involve gain of electrons or a decrease in oxidation number, so they are reduction processes.

Answer:

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