A numerical computation has been computed to study, the effects of heat source, and chemical reaction (homogeneous) on MHD mixed convective flow of an electrically conducting viscous fluid through a vertical surface. The fluid and porous properties, thermal and solutal diffusivity, permeability and porosity are considered to be varied. The governing non-linear PDE's are derived for the flow and converted to a system of ODE's using a suitable similarity transformation. A numerical computation of shooting technique is employed along with Runge- Kutta method of fourth and Newton-Raphson algorithm to analyze the behavior of the fluid graphically for various non-dimensional parameters which are controlling the flow of the physical system. The results of the numerical scheme are validated and a numerical comparison has been made with the available literature in the absence of some parameters and it is found to be in good agreement. © 2018 Trans Tech Publications, Switzerland.