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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 purifiedin Baeyer's process. (III) During Serpeck's process silica, is removed as Si(vapour).

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a

I, II and III

b

Both II and III

c

Both I and III

d

Both I and II

answer is B.

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Detailed Solution

Hall process Al2O3+Na2CO3⟶2NaAlO2+CO2Baeyer's processAl2O3+2NaOH+3H2O⟶2NaAl(OH)4Sepeck's processAl2O3+3C+N2⟶2AlN+3COand SiO2+2C⟶Si+CO

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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 purifiedin Baeyer's process. (III) During Serpeck's process silica, is removed as Si(vapour).