Why so2 act as reducing as well as oxidizing agent and so3 act as oxidizing agent ?
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SO2 can act as both oxidising as well as reducing agent because it has (+4) oxidation state, which is exactly between its highest O.S. +6 and lowest O.S. (+2)
Hence it can change its oxidation no. either from +4 to +2 (reduction) or from +4 to +6 (oxidation). Whereas so3 is already in it's highest OS and hence can only reduce its oxidation no
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