JEE Main · 2021 · 18 Mar 2021 · Shift 1 · p-Block Elements

The chemical that is added to reduce the melting point of the reaction mixture during the extraction of aluminium is:

(A)Kaolite
(B)Bauxite
(C)Calamine
(D)Cryolite✓ Correct

Answer: (D)

Solution

Pure alumina melts near

2320 K

, far too high for an economic electrolysis. Cryolite,

N a_{3} Al F_{6}

, dissolves the alumina and brings the working temperature of the melt down to roughly

1220 K

, and at the same time raises the conductivity of the bath. The chemical added is cryolite.

JEE Main · 2021 · 18 Mar 2021 · Shift 1 · Single correct option

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