alleryStart learning →The composition of the aluminium ore bauxite is
A$Fe_2O_3 \cdot 2H_2O$
B$Al_2O_3 \cdot nH_2O$
C$Al_2O_3 \cdot SiO_2$
D$Na_3AlF_6$
Answer & Solution
Correct answer: B. $Al_2O_3 \cdot nH_2O$
1. Bauxite is a hydrated oxide ore of aluminium.
2. Its formula is $Al_2O_3 \cdot nH_2O$ (hydrated alumina).
3. $Na_3AlF_6$ is cryolite (an additive in electrolysis), not the ore.
_Source: Samacheer Kalvi Class 12 Chemistry Vol.1, Unit 1 'Metallurgy', Evaluation Q.1_
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