When SO2 is passed into an acidified potassium dichromate solution, the oxidation numbers of sulphur and chromium in the final products respectively are:

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+6, +6

+6, +3

0, +3

+2, +3

answer is B.

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Detailed Solution

The redox reaction is : Cr2O72−+3SO2+2H+⟶2Cr3++3SO42− +H2O

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