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ln Hall's process. the main reagent is mixed with

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NaF

Na₃AIF₆

AIF₃

None of these

answer is B.

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Detailed Solution

Pure alumina is a bad conductor of electricity and the fusion temperature of pure alumina is about 2000°C and at this temperature when the electrolysis is carried of fused mass the metal formed vaporises as the boiling point of Al is l800°C.

To overcome this difficulty, Na₃AIF₆ and CaF₂ are mixed with alumina.

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