Question on: JAMB Chemistry - 2024
In the extraction of Aluminium, the silica impurity is removed by:
A
electrolysis
B
filtration
C
reaction with H2SO4
D
precipitation
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Correct Option: B
The silica impurity (SiO2) is removed by reacting it with a base such as sodium hydroxide (NaOH) to form soluble sodium silicate. This is part of the Bayer process.
Other options are incorrect because:
- Electrolysis: Used to extract aluminium from molten ore.
- Filtration: Removes solids but not the primary method for silica removal.
- Precipitation: Separates solids but not the main method for silica removal.
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