The heat and mass transfer characteristics of natural convection flow of a chemically-reacting Newtonian fluid along vertical and inclined plates in the presence of diffusion-thermo (Dufour) and thermal-diffusion (Soret) effects are studied. The conservation equations for mass, momentum, heat and concentration are normalized and then solved using the local nonsimilarity method and a shooting scheme. Velocity is increased with order of the chemical reaction (m) as is temperature (θ) and concentration (φ).Temperature (θ) is increased with increasing positive inclination of the plate (γ), whereas velocity (f/) is reduced. An increase in reaction rate parameter (χ) however reduces the concentration values in the boundary layer. Skin friction coefficient is found to be enhanced with a positive increase in concentration-tothermal- buoyancy ratio parameter (N) as are local Nusselt number and the local Sherwood number. A negative N value reverses this trend. An increase in Dufour number, Du (with a simultaneous decrease in Soret number), (Sr) significantly heats the fluid and also increases concentration values. For the non-reactive case, neglecting Dufour and Soret effects, good correlation of the present numerical solutions is achieved with the earlier study by Chen et al (1980). The present study finds applications in chemical engineering, furnaces, solar collector energy systems and geophysical fluid mechanics