Question

In the extraction of aluminium;
Process X: applied for red bauxite to remove iron oxide
Process Y: (Serpeck's process): applied for white bauxite to remove Z (chief impurity)

Then, process X and impurity Z are:

• A. X = Hall and Heroult's process and Z = $Si{O}_2$
• B. X = Bayer's process and Z = $Si{O}_2$
• C. X = Serpeck's process and Z = iron oxide
• D. X = Baeyer's process and Z = iron oxide

Answer 1

The correct option is B X = Bayer's process and Z = $Si{O}_2$

Bayer's process is used for benficiation of red bauxite. Serpeck's process is used for benficiation of white bauxite.
Reaction to remove impurity;
$Si{O}_2+2C\to Si+2CO$