Choose the best: Metallurgy of Aluminium — task. Science State Board, Class 10.

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Choose the best answer:

1. __________ is a ore of aluminium.

Zinc blende
Cryolite
Hamatitte
Cuppyrite

2. The molecular formula of bauxite is ___________.

\(Al_2O_4.2H_2O\)
\(Al_2O_3.5H_2O\)
\(Al_2O_3.2H_2O\)
\(Al_2O_3.3H_2O\)

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