Chemical elements
    Physical Properties
    Chemical Properties
    Atomic Weight
      Hydrogen Telluride
      Tellurium Tetrafluoride
      Tellurium Hexafluoride
      Tellurium Oxyfluorides
      Tellurium Dichloride
      Tellurium Tetrachloride
      Tellurium Perchlorate
      Tellurium Dibromide
      Tellurium Tetrabromide
      Tellurium Oxybromides
      Tellurium Tetra-iodide
      Tellurium Monoxide
      Tellurium Dioxide
      Tellurium Trioxide
      Telluric Acids
      Tellurium Disulphide
      Tellurium-Sulphur Sesquioxide
      Tellurium Sulphates
      Telluropentathionic Acid
      Tellurium Nitride
      Tellurium Nitrite
      Basic Tellurium Nitrate
      Carbon Sulphidotelluride
      Tellurium Dicyanide
    PDB 1el7-4fon

Tellurium-Sulphur Sesquioxide, TeSO3

As mentioned, tellurium dissolves in sulphuric acid giving a red solution which probably contains a Tellurium-Sulphur Sesquioxide or Tellurium Sulphoxide, TeSO3.

The compound is obtainable in the solid state by the addition of powdered tellurium to sulphur trioxide, when combination occurs with evolution of heat. Any excess of sulphur trioxide can be removed mechanically or by evaporation under reduced pressure.

The substance, which is of a type general to the sulphur group, is a red solid which softens at 30° C. without melting. It is decomposed by water mainly into tellurium and sulphuric acid, whilst in solution in sulphuric acid it undergoes oxidation into basic tellurium sulphate on warming. Between 35° and 90° C. it is stated that the red compound is converted into an isomeric form having a reddish-brown colour.

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