In this paper, the effects of chemical reaction on unsteady MHD flow of viscous incompressible electrically conducting fluid past an impulsively started oscillating vertical plate with variable temperature and constant mass diffusion in the presence of Hall current have been presented. The dimensionless governing partial differential equations of the flow have been solved numerically by using the Crank-Nicolson implicit finite difference scheme. The numerical solutions for primary fluid velocity, secondary fluid velocity, fluid temperature and fluid concentration are plotted graphically whereas the numerical results of primary skin friction, secondary skin frictions, rate of heat and mass transfer are presented in tabular form for various parameters involved. A comparison has been provided between the present results and with the existing analytical solutions by the Laplace transforms technique. It has been found that the results of the present study are in excellent agreement with previously obtained results.
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