Colloidal particles always carry an electric charge. This charge may be positive or neagtive.
From the data given,
Negatively charged sols are:
Pt,Au,Ag,As2S3,Starch,
clay,H4SiO4,eosin,Cu,
CdS,Congo red
Positively charged sols are: Fe(OH)3, Al(OH)3, methyleneblue,Haemoglobin, Cr(OH)3