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JAMB Chemistry 2014 Paper

Question : 29

Total: 45

In the electrolytic extraction of calcium from calcium chloride, the cathode is

Solution:

Concept:

In the electrolysis of fused calcium chloride, calcium metal is deposited at the cathode.

Explanation:

Calcium chloride,

\mathrm{CaCl}_2

, is melted and electrolysed.

At the cathode, calcium ions are reduced:

\mathrm{Ca^{2+} + 2e^- \rightarrow Ca}

The cathode used in the industrial extraction of calcium is made of iron.

Answer:

D. iron

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