The present paper analyses two dimensional motions of incompressible electrically conducting and radiating fluid through a porous medium occupying a semi-infinite region of space bounded a vertical infinite surface with heat source/heat sink in the presence of chemical reaction taking into an account. An analytical solution for this flow is utilized by means of perturbation technique. The expressions are obtained for velocity, temperature and concentration fields are derived and results for various parameters shown graphically and the skin friction coefficient, the rate of heat transfer are also derived.