Mercury(II) fluoride

Mercury(II) fluoride, also known as mercuric fluoride, is a chemical compound. Its chemical formula is HgF2. It has mercury and fluoride ions in it. The mercury is in its +2 oxidation state.
Properties.
Mercury(II) fluoride is a white solid. It reacts with water to make hydrofluoric acid. It breaks down when heated strongly. 
Preparation.
It is made by reacting mercury(II) oxide with hydrogen fluoride or hydrofluoric acid.