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a. State the reason for addition of caustic alkali to bauxite ore during purification of bauxite.
b. Along with cryolite and alumina, another substance is added to the electrolyte mixture. Name the substance and give one reason for the addition.
b. Along with cryolite and alumina, another substance is added to the electrolyte mixture. Name the substance and give one reason for the addition.
a. Naturally, Bauxite is not in ordinary solvents. Therefore the addition of caustic alkali to bauxite plays an essential role during the extraction of .
Caustic alkali dissolves bauxite forming soluble while impurities remain insoluble and precipitate mud.
\(Al_2O_3.2H_2O\) + \(2NaOH\) → + \(3H_2O\)
Bauxite + Caustic alkali → Sodium meta aluminate + Water
b. Along with cryolite and alumina, another substance is added to the electrolyte mixture is .
Reason for the addition: Fluorspar of the electrolyte.
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