An analytical study for the problem of unsteady hydromagnetic flow of a micropolar fluid over a moving vertical permeable plate in presence of chemical reaction, thermal radiation and internal heat sink with Soret effect is presented. The expressions for linear and angular velocities, temperature and concentration distributions are computed analytically. The effects of various physical parameters involved in the problem are studied. The computed results show that the flow is significantly influenced by Soret effect. It was found that due to the presence of Soret effect, the velocity profile, concentration profile, skin friction and couple stress coefficient increase whereas reverse trend is seen for angular velocity and Sherwood number. Also, an increase in the heat sink parameter leads to decrease in the velocity profile, temperature profile, concentration profile, skin friction, couple stress coefficient, Nusselt number and Sherwood number whereas angular velocity increases.

unsteady flow, MHD, micropolar fluid, Soret effect, chemical reaction.