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TNPSC Group 2 · 2017 Preliminary Examination

103.  The oxidation of SO₃²⁻ to SO₄²⁻ ion by oxygen
SO₃²⁻ + :Ö → SO₄²⁻, in this reaction which is Lewis acid and Lewis base?

Answer: B.   Oxygen is Lewis acid and SO₃²⁻ is Lewis base
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