Question

In the extraction of aluminium,
Process X: applied for red bauxite to remove iron oxide (chief impurity)
Process Y: applied for white bauxite to remove Z (chief impurity).

Then, Process X and impurity Z are:

• A. X $=$ Hall - Heroults process & Y$=$ $Si{O}_2$
• B. X $=$ Bayers process and Z $=$ $Si{O}_2$
• C. X $=$ Serpecks process and Y $=$ iron oxide
• D. X $=$ Baeyers process and Y $=$ iron oxide

Answer 1

Answer: (B)

X $=$ Bayers process and Z $=$ $Si{O}_2$

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