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

cryolite and fluorspar

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Bauxite

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Iron and fluorspar

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none of these

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Solution

The correct option is A cryolite and fluorspar
Pure alumina melts at about $2000^{o} C$ and is a bad conductor of electricity. If fused cryolite and fluorspar is added, the mixture melts at $900^{0} C$ and $A l_{2} O_{3}$ becomes a good conductor of electricity.

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Similar questions

Name the following:

(a) A metal which is liquid at room temperature.

(b) The process of heating an ore to a high temperature in the presence of air.

(d) A compound which is added to lower the fusion temperature of the electrolytic bath in the extraction of aluminium.

(e) Name an allotrope of a non-metal that allows electricity to pass through it.

(C a F_{2})

(N a_{3} A l F_{6})

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