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WAEC Chemistry 2020 Paper

Question : 5

Total: 49

Solution:

Concept:

Oxidation of iron(II) to iron(III) involves the loss of electrons.

Explanation:

The ionic equation is:

\mathrm{Fe}^{2+} \rightarrow \mathrm{Fe}^{3+} + e^-

Each iron(II) ion loses exactly one electron to become iron(III).

Therefore, one mole of

\mathrm{Fe}^{2+}

ions loses one mole of electrons.

Answer:

C. 1 mole

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