When SO2 was a passed through an acidified K2Cr2O7 solution
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When Sulphur dioxide is passed through an acidified K2Cr2O7 solution ,the oxidation state of sulphur changes to (3) +4 to +6. Explanation: For occurance oxidation, the occurance of reduction is also important.
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Sulpur dioxide turns into acidifiwd potassium dichromate from orange to green reduced
chromium +4 to +3
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