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Question

A compound added to lower the fusion temperature of the electrolytic bath in the extraction of Al is ___________.

A
cryolite and fluorspar
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B
Bauxite
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C
Iron and fluorspar
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D
none of these
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Solution

The correct option is A cryolite and fluorspar
Pure alumina melts at about 2000oC and is a bad conductor of electricity. If fused cryolite and fluorspar is added, the mixture melts at 9000C and Al2O3 becomes a good conductor of electricity.

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