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Q.

In the electrolysis of molten alumina during the extraction of aluminium:

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a

Al2O3 undergoes dissociation

b

cryolite undergoes dissociation

c

Al2O3 and cryolite both undergo dissociation

d

Neither of the two undergoes dissociation

answer is B.

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Detailed Solution

Na3AlF6 or 3NaF.AlF6NaF⇌compoundIonicNa++F−;AlF3⇌compoundlonicAl3++3F−
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In the electrolysis of molten alumina during the extraction of aluminium: