An inclined channel is used to study the flow of an unsteady MHD free convection fluid under mass transfer and heat transfer with chemical reaction. In order to obtain the expression for velocity, temperature and concentration, the highly nonlinear coupled ordinary differential equations of the flow were transformed into ordinary differential equations. The expression for velocity, temperature and concentration is obtained using regular perturbation parameters. We show the effects of various parameters on velocity, temperature, and concentration, including Schmidt number, thermal Grashof number, singular Grashof number, chemical reaction, and angle of inclination.