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Q.

During Hoopes process for electrolytic refining of Al, the middle layer is of

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a

pure Al

b

impure aluminium

c

alloys of Al, Ca and Si

d

cryolite and ${NaF}_{2}$

answer is A.

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Detailed Solution

In the Hoopes process the middle layer consists of cryolite and ${BaF}_{2}$ .

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