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Q.

Which of the following chemical reactions represents Hall-Heroult Process?

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a

FeO+CO→Fe+CO2

b

 Al2O3 + CaF2 or Na3AlF6.

c

Cr2O3+2Al→Al2O3+2Cr

d

2[Au(CN)2](aq)−+Zn(s)→2Au(s)+[Zn(CN4)]2−

answer is B.

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Detailed Solution

Hall Heroult process is the major industrial process for extraction of aluminium.

calcium fluoride decrease melting point, where as cryolite will enhance conductivity

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