The oxoacid of sulphur which contains two sulphur atoms in different oxidation states is:
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Correct option is A)
Disulphurous acid or pyrosulphurous acid is an oxoacid of sulphur with the formula H2S2O5. The salts of disulphurous acid are called disulphites or metabisulphites. The oxidation state of the sulfur atom bonded to 3 oxygen atoms is +5 while the oxidation number of other sulfur atom is +3.