# The empirical formulae for zeolites

$\begin{array}{1 1}(a)\;(Si_2O_3)_n^{2n-}\\(b)\;(Si_2O_5)_n^{2n^-}\\(c)\;(Si_2O_4)_n^{2n-}\\(d)\;Si_2O_5)^{2n-}\end{array}$

The empirical formulae for zeolites $(Si_2O_5)^{2n-}$
Hence (b) is the correct answer.