We investigate a locally similarity solution of unsteady natural convection heat and mass
transfer boundary layer flow past a flat porous plate. The effects of chemical reaction rate
and Arrhenius activation energy on the velocity, temperature and concentration are also
studied in this paper. The governing partial differential equations are reduced to ordinary
differential equations by introducing locally similarity transformation Maleque [14]. Numerical
solutions to the reduced non-linear similarity equations are then obtained by adopting …