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Sulphur hexaflouride (SF6) and Sulfur tetrafluoride (SF4) Sulphur forms a number of halides in which the oxidation state of sulphur are +1, +2, +4 and +6. The well known halides are S 2 X 2 (X=F,Cl,Br or I) = oxidation state of S is +1 SX 2 (X=F or Cl) = oxidation state of S is +2 Sulphur hexaflouride (SF6) The oxidation state of Sulphur (s) in Sulphur hexaflouride ( SF 6 ) is +6. Sulphur hexaflouride (SF6) is prepared by direct combination of Sulphur (S) and Flourine (F). 1/8 S 8   +  3F 2   ----------->  SF 6 Sulphur hexaflouride ( SF 6 ) has octahedral shape. Sulphur atom is Sp 3 d 2 hybridised. Sulfur tetrafluoride (SF4) Sulfur tetrafluoride (SF4) is prepared by fluorination of SCl 2 with NaF 3SCl 2   +  4 NaF  ------------>  S 2 Cl 2   +  SF 4   +  4 NaCl Sulphur atom is  Sp 3 d hybridized in SF 4 and possess triagonal bipyramidal geometry with one corner is occupied by ...

Hydrogen sulphide is prepared in laboratory by the action of dilute HCl or dilute H2SO4 on ferrous sulphide in Kipp’s apparatus. FeS + H2SO4 ---------->4 + H2S Physical properties It is colourless gas with the smell of rotten eggs. It is denser than air and is soluble in water. Chemical properties 1. Combustibility Hydrogen sulphide burns in limited supply of oxygen to form sulphur. In presence of excess of oxygen, it gives sulphur dioxide. 2. Acidic property H2S is a weak dibasic acid and forms two types of salts namely bisulphides and sulphides NaOH + H2S ----------> NaHS + H2O 2NaOH + H2S ----------> Na2S + 2H2O 3. Action with metals When H2S is passed over hot metals the sulphides and hydrogen are formed Cu + H2S -----------> CuS + H2 4. Hydrogen sulphide in qualitative analysis H2S precipitates metal sulphides having characteristic colours from metal salt solutions in acidic or alkaline medium. Therefore H2S is used in qualitative analysis to identify metal ions belong...

Related article sulphur dioxide

The stable oxides of sulphur are sulphur dioxide (SO2) and sulphur trioxide (SO3) Sulphur when burnt in air form sulphur dioxide. S8 + 8O2 -------------> 8SO2 SO2 is a gas at room temperature. It exists as descrete SO2 molecule with angular structure. SO3 is an acidic oxide and exist as planar triangular molecule in gas phase. In solid state, SO3 exist either as cyclic trimer or linear chain polymer.