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Question
Sulphur dioxide acts as an oxidising agent as well as a reducing agent. Give one reaction each to show its oxidising nature and its reducing nature.
Chemical Equations/Structures
Short Answer
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Solution
Sulphur dioxide as a reducing agent: Sulphur dioxide reduces potassium dichromate in an acidic medium.
\[\ce{K2Cr2O7 + 3SO2 + 4H2SO4 -> Cr2(SO4)3 + K2SO4 + 3H2O}\]
Sulphur dioxide as an oxidising agent: Sulphur dioxide oxidises hydrogen sulphide.
\[\ce{2H2S + SO2 -> 2S + 2H2O}\]
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