# Natron is a mineral whose formula represented

$\begin{array}{1 1}(a)\;Na_2CO_3.H_2O&(b)\;Na_2CO_3.10H_2O\\(c)\;Na_2SO_4.H_2O&(d)\;Na_2SO_4.7H_2O\end{array}$

Natron is a mineral whose formula represented $Na_2CO_3H_2O$
Hence (a) is the correct answer.