Question

Bauxite is purified by:

• A. Hall's process
• B. Baeyer's process
• C. Serpeck's process
• D. L.D process

Answer 1

Answer: (A), (B), (C)

The correct options are
A Hall's process
B Baeyer's process
C Serpeck's process

A)The Hall Hroult's process is the major industrial process for smelting aluminium (bauxite).

B)The Bayer process is the principal industrial means of refining bauxite to produce alumina (aluminium oxide).

C) Serpeck's process: This process is used when silica is present in considerable amount of bauxite ore. The ore is mixed with coke and heated to 1800C in presence of nitrogen, when aluminium nitride is forms.

Basic oxygen steelmaking (BOS, BOP, BOF, and OSM), also known as Linz-Donawitz-Verfahren (L.D process) steelmaking or the oxygen converter process is a method of primary steel making in which carbon-rich molten pig iron is made into steel.

So only option D is wrong

Hence options A,B & C are correct.