why so2 can act as both oxidizing as well as reducing agent?

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Solution

In SO₂ the oxidation state of sulphur is +4, it can lose its two more electron to attain +6 oxidation state. Moreover it can gain electrons to reach the oxidation state of -2 (lowest oxidation state observed in its compound). Since it has a capability to lose and gain electron therefore it acts as oxidizing as well as reducing agents.

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