Do Doubly Charged Monatomicanions Exist in Aqueous Solutions?

The chalcogenide atoms (X = oxygen, sulfur, selenium, tellurium, polonium) form doubly charged monatomic anions, X2–, which exist in crystalline salts. The question arises whether, once such salts are dissolved in water, such species persist, or do they hydrolyze completely to form the hydrochalcogenide anion. It is clear that in the case of oxygen this reaction proceeds to the right to completion