Question

$554y5(269 \times$
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Answer 1

Answer:

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Explanation:

The electrolysis of pure alumina faces some difficulties. Pure alumina is a bad conductor of electricity. The fusion temperature of pure alumina is about 2000

∘

C and at this temperature when electrolysis is carried out on the fused mass, the metal formed vaporizes, as the boiling point of aluminium is 1800

∘

C. These difficulties are overcome by using a mixture containing alumina, cryolite (Na

3

.AlF

6

), and fluorspar (CaF

2

) which forms a melt with lower melting temperature.

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