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Mercury(II) hydroxide or mercury dihydroxide is an inorganic metal hydroxide with the chemical formula HgH2O2 or more commonly written as Hg(OH)2.

Synthesis
"Mercury (II) hydroxide can be prepared via irradiating a mixture of Hg, H 2, and O 2 in solid neon and argon with a mercury arc lamp."

Uses
Since Mercury (II) Hydroxide cannot be isolated as either an aqueous or solid compound, there are no known uses.