The flocculation values of KCl, MgCl2, CrCl3 and SnCl4 for a negatively charged sol are in the order:
KCl<MgCl2<CrCl3<SnCl4
KCl=MgCl2=CrCl3=SnCl4
MgCl2<KCl<CrCl3<SnCl4
SnCl4<CrCl3<MgCl2<KCl
Lower the charge on the ion, higher the flocculation value.