JEE Advanced Chemistry question

SO2 behaves as a reducing agent when

(A)Passed over hot CuO
(B)Mixed with moist H2S
(C)Passed through acidified KMnO4 solutionCorrect
(D)Passed through FeSO4 solution

Answer: (C)

Solution

SO2 acts as a reducing agent (itself getting oxidised from S(+4) to S(+6)) when it reduces acidified KMnO4: 2MnO4⁻ + 5SO2 + 2H2O → 5SO4²⁻ + 2Mn²⁺ + 4H⁺, so (c) is correct. In (b), mixing SO2 with moist H2S

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Question ID VK-159319