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JAMB Chemistry 2018 Paper

Question : 24

Total: 87

Solution:

Concept:

Equal quantity of electricity liberates masses proportional to chemical equivalents.

Explanation:

Silver is monovalent, so equivalent mass of Ag =

\frac{108}{1} = 108

Aluminium is trivalent, so equivalent mass of Al =

\frac{27}{3} = 9

Using Faraday's second law:

\frac{\text{mass of Al}}{\text{mass of Ag}} = \frac{\text{equivalent mass of Al}}{\text{equivalent mass of Ag}} = \frac{9}{108} = \frac{1}{12}

Mass of Al =

\frac{3.6}{12} = 0.3\text{ g}

Answer:

0.3 g

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