A-characteristic velocity, B-reciprocal of characteristic length, B 0-magnetic field coefficient, Kg/(s 2 A); C-concentration, mol/m 3 ; C p-specific heat at constant pressure, J/(kg K); C ∞-ambient concentration, mol/m 3 ; C f-skinfriction coefficient, D-mass diffusivity, m 2 /s; E-reciprocal of the product of characteristic length and time, f-dimensionless stream function, g-dimensionless microrotation, g*-acceleration due to gravity, m/s 2 ; j-dimensional micro-inertia density, kg/m 3 ; -dimensionless microinertia density, k-thermal conductivity, W/(m K); k 1-mean absorption coefficient, 1/m; L-buoyancy parameter, m w-wall couple stress, Pa/m; M-magnetic parameter, M 1-the ratio (temperature/length), Km-1 ; M w-non-dimensional couple stress on the wall, N-coupling parameter, N 1-ratio (concentration/length), mol/m 4 ; Nu-dimensionless Nusselt number, Pr-Prandtl number, q r-radiative heat flux, W/m 2 ; R-thermal radiation parameter, W; R*-rate of chemical reaction, mol/(ms); Sc-Schmidt number, Sh-Sherwood number, T-temperature of the fluid, K; T ∞-ambient temperature, K; U(x)-ambient velocity, m/s; u, v-velocity components in the x-and y-directions respectively, m/s; x, y-cartesian coordinates along the plate and normal to it, m; α-thermal diffusivity, m 2 /s; β T-coefficient of thermal expansion, K-1 ; β C-coefficient of concentration expansion, K-1 ; γ-spingradient viscosity, m 2 /s; δ-non-dimensional chemical reaction parameter, η-similarity variable, m; θ-dimensionless temperature,-thermal conductivity of the fluid, W/(mK); λ-non-dimensional spin-gradient viscosity,-viscosity of the fluid, kg/(ms); υ-kinematic viscosity, m 2 /s;-density of the fluid, kg/m 3 ; σ-electrical conductivity, s 3 A 2 /(kgm 3 .); σ*-Stefan-Boltzmann constant, W/(m 2 K 4); τ w-wall shear stress, Pa; -dimensionless concentration, ψ-stream function,-microrotation component, kg.m 2 /s; w-condition at wall, ∞-condition at infinity, '-differentiation with respect to η.