Question

Which material is used to bring melting point lower in
electrochemical reduction to obtain aluminium from
alumina?

A) Cryolite
B) Feldspar
C) Salg
D) Anhydrous calcium chloride.​

Answer 1

Answer: CRYOLITE IS THE ANSWER.

Explanation:

Elemental aluminium cannot be produced by the electrolysis of an aqueous aluminium salt, because hydronium ions readily oxidize elemental aluminium. Although a molten aluminium salt could be used instead, aluminium oxide has a melting point of 2072 °C so electrolysing it is impractical. In the Hall–Heroult process, alumina, Al2O3, is dissolved in molten synthetic Cryolite, Na3AlF6, to lower its melting point for easier electrolysis.

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Answer 2

Answer:

cryolite is the answer.

Explanation:

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