This investigation is undertaken to study the effects of chemical reaction and radiation absorption on unsteady free convection flow with heat and mass transfer of an incompressible, viscous, electrically conducting fluid past a vertical moving plate in an aligned magnetic field through porous medium in the presence of temperature gradient heat source. An exact solution for the flow problem has been obtained by solving the governing equations using Laplace-transform technique. At time t'>0, the plate is given an impulsive motion with uniform velocity u = u0 in its own plane. At the same time, the plate temperature and concentration levels near the plate are raised to T'w and C'w respectively. Graphical results for velocity, temperature and concentration profiles are presented and discussed. © Research India Publications.