Silver dichromate is a chemical compound with the formula Ag2Cr2O7. It is insoluble in water and decomposes when treated with hot water. Its ion has a charge of 2- Silver dichromate is a chemical compound with the formula Ag2Cr2O7. It is insoluble in water and decomposes when treated with hot water. Its ion has a charge of 2- Related complexes are used as oxidants in organic chemistry. For instance, tetrakis(pyridine)silver dichromate, 2+2−, is used to convert benzylic and allylic alcohols to corresponding carbonyl compounds.