We know,
π=iCRT
π∝iC
A. 0.500MC2H5OH(aq)(iC=1×0.5=0.5) and 0.25MKBr(aq)(iC=2×0.25=0.5)
B. 0.100MK4[Fe(CN)6](aq)(iC=5×0.1=0.5) and 0.100M FeSO4(NH4)2SO4(aq)(iC=5×0.1=0.5)
C. 0.05MK4[Fe(CN)6](iC=5×0.05=0.25) (aq) and 0.25MNaCl(iC=2×0.25=0.5) (aq)
D. 0.15MNaCl(aq)(iC=2×0.15=0.3) and 0.1MBaCl2(aq)(iC=3×0.1=0.3)
E. 0.02MKCl.MgCl2.6H2O(aq)(iC=5×0.02=0.1) and 0.05M KCl(aq)(iC=2×0.05=0.1)