JEE Advanced Chemistry question

SO2 can reduce

(A)HClO3 to HCl
(B)Cr2O7²⁻/H+ to Cr3+
(C)MnO4⁻/H+ to Mn2+
(D)All of thoseCorrect

Answer: (D)

Solution

SO2 (as its hydrated/sulphite form) is a versatile reducing agent in acidic solution, capable of reducing each of these oxidants as it is itself oxidised to sulphate:

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Question ID VK-159416