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# Borax has the molecular formula

$\begin {array} {1 1} (A)\;Na_2[B_4O_3(OH)_4].6H_2O \\(B)\;Na_2[B_4O_5(OH)_4].6H_2O \\ (C)\;Na_2[B_4O_5(OH)_4].8H_2O \\ (D)\;Na_2[B_4O_6(OH)_2].8H_2O \end {array}$

The structure of Borax is
$Na_2[B_4O_5(OH)_4].8H_2O$
Hence option (C) is the correct answer.
edited Jul 28, 2014