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Q.

Alumina is mixed with ‘X’ and ‘Y’ and then subjected to electrolysis by Hall-Heroult process. ‘X’ and ‘Y’ are
respectively.

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a

Na3AlF6 and CaF2

b

CaF2 and NaF

c

Na3AlF6 and CaCO3

d

NaF and CaCO3

answer is A.

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Cryolite & Fluorspar are added to Al2O3 to increase conductivity and decrease fusion temperature

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