Hg(OH)2, yes, it does exist. Although it must be synthsized as it deosn't exist naturally. Molecules has been isolated (2004) on frozen neon or argon. If you try and make it by adding hydroxide to a solution of Hg2+ what you get is HgO, Mercury(II) oxide as a precipitate.
Mercury (I) hydroxide.
HgOH would be called mercury(I) hydroxide or mercurous hydroxide. This is a compound that is not well characterised, in other words it is reported by chemists but (as far as I know) the existence of the solid compound has not been proven- e.g. by x-ray crystallography. Some authors say it only exists in solution. It would contain the diatomic Hg22+ ion and the formula would be written Hg2(OH)2.
Magnesium hydroxide is used as an antacid to neutralise the effect of acid in the stomach.
Ammonium hydroxide (also known as Ammonia, or NH3) has covalent bonding.
It has no Ph level it doesn't have Hydroneam or Hydroxide ions.
Mercury (I) Hydroxide Hg OH2 (2 is subscript) Mercury(II) Hydroxide Hg (OH)2
The color of mercury(II) hydroxide is tan-brown.
The formula of mercury(I) hydroxide is Hg2(OH)2.
Mercury (I) hydroxide.
HgOH would be called mercury(I) hydroxide or mercurous hydroxide. This is a compound that is not well characterised, in other words it is reported by chemists but (as far as I know) the existence of the solid compound has not been proven- e.g. by x-ray crystallography. Some authors say it only exists in solution. It would contain the diatomic Hg22+ ion and the formula would be written Hg2(OH)2.
Nitrogen hydroxide don't exist ! Any formula is an error ! You think probably to ammonium hydroxide NH4OH.
A group hydroxide doesn't exist.
Hg(OH)2
Magnesium hydroxide is used as an antacid to neutralise the effect of acid in the stomach.
Ammonium hydroxide (also known as Ammonia, or NH3) has covalent bonding.
Life cannot exist on Mercury.
It has no Ph level it doesn't have Hydroneam or Hydroxide ions.