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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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An Intiative by Sri Chaitanya

Both I and III

I, II and III

Both II and III

Both I and II

answer is B.

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Detailed Solution

Hall process ${Al}_{2} O_{3} + {Na}_{2} {CO}_{3} ⟶ 2 {NaAlO}_{2} + {CO}_{2}$

Baeyer's process

${Al}_{2} O_{3} + 2 NaOH + 3 H_{2} O ⟶ 2 Na [Al (OH)_{4}]$

Sepeck's process

${Al}_{2} O_{3} + 3 C + N_{2} ⟶ 2 AlN + 3 CO$

and ${SiO}_{2} + 2 C ⟶ Si + CO$

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