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An attempt is made to investigate the heat and mass transfer effects on an unsteady free convection flow of a rotating, incompressible, viscous Boussinesq fluid in presence of first order chemical reaction. The governing dimensionless equations for this investigation are solved numerically by a finite element method. A parametric study illustrating the influence of different flow parameters on velocity, concentration and temperature are investigated. Also the Skin – friction, Nusselt number and Schmidt number are shown through tabular forms. Numerical results are presented for various parameters.