Why Silver Fluoride is Soluble in Water but Silver Chloride not Soluble? - QS Study
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Ionic compounds are generally soluble in polar solvents like water, covalent compounds are not. So if the anion of any salt is very much polarized, a may have so much covalent character, that it may be insoluble in polar solvent.

For example among; the halides of Silver, Ag+, the fluoride ion in Silver Fluoride (AgF) is least polarized and hence it is soluble in water. But the halide ions in (Silver Chloride) AgCl, AgBr and Agl are very much polarized, so covalent character predominates in these salts and they are insoluble in water.