1. Tardigrade
  2. Question
  3. Chemistry
  4. Observe the following statements regarding purification of bauxite (I) During Hall's process, silica, is removed as Si (vapour). (II)Bauxite ore contaminated with iron oxide is purified in Baeyer's process. (III) During Serpeck's process silica, is removed as Si (vapour).

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Q. Observe the following statements regarding purification of bauxite
(I) During Hall's process, silica, is removed as $Si$ (vapour).
(II)Bauxite ore contaminated with iron oxide is purified in Baeyer's process.
(III) During Serpeck's process silica, is removed as $Si$ (vapour).

General Principles and Processes of Isolation of Elements

Solution:

Hall process $Al _{2} O _{3}+ Na _{2} CO _{3} \longrightarrow 2 NaAlO _{2}+ CO _{2}$

Baeyer's process $Al _{2} O _{3}+2 NaOH +3 H _{2} O \longrightarrow 2 Na \left[ Al ( OH )_{4}\right]$

Sepeck's process $Al _{2} O _{3}+3 C + N _{2} \longrightarrow 2 AlN +3 CO$ and $SiO _{2}+2 C \longrightarrow Si + CO$