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# The chief ore for the extraction of aluminium is

$\begin {array} {1 1} (A)\;Bauxite & \quad (B)\;Cryolite \\ (C)\;Beryl & \quad (D)\;Mica \end {array}$

Bauxite is $Al_2O_3.2H_2O$
Hence option (A) is the correct answer.
edited Jul 28, 2014