Aluminium sulphate aqueous solution cannot be used as
an electrolyte for extraction of aluminium though it is a
strong electrolyte. Why?
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Aluminium oxide does not dissolve in water, but it does dissolve in molten cryolite. This is an aluminium compound with a lower melting point than aluminium oxide. The use of cryolite reduces some of the energy costs involved in extracting aluminium.
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Answer:
it cannot dissolve in water so aluminum sulphate aqueous solution cannot be used electrolyte....
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