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JAMB Chemistry 2013 Paper

Question : 16

Total: 44

Solution:

Concept:

Reduction is the gain of electrons, shown by a decrease in oxidation number.

Explanation:

\mathrm{F}_2

, the oxidation state of fluorine is

0

\mathrm{HF}

, the oxidation state of fluorine is

-1

Each fluorine atom gains one electron:

\mathrm{F}_2 + 2e^- \rightarrow 2\mathrm{F}^-

Therefore, fluorine is reduced because it gains electrons.

Answer:

\mathrm{F}_{2(g)}

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