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.
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