In this research we study the heat and mass transfer for the magnetohydrodynamic (MHD) free convection flow over an impulsively started infinite vertical flat plate in the presence of thermal radiation and thermal diffusion (Soret effect) in a rotating viscous fluid. The governing equations, which are the momentum equation, energy equation and mass equation, are derived by using the conservation law. The governing equations are transformed into non-dimensional forms by using the non-dimensional variables. The exact solutions of the non-dimensional governing equations are obtained with the help of Laplace transform technique. These solutions satisfy all imposed initial and boundary. The numerical results of velocity, temperature, concentration, skin friction, the rate of heat transfer and mass transfer are displayed and analysed through graphs and tables. The results show that with increasing rotation parameter E, the secondary velocity increases whereas primary velocity decreases. The primary velocity and secondary velocity are increased by increasing of Soret number, So but decreased by increasing radiation parameter, R
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