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Question

What happens when SO2 is passed through acidified K2Cr2O7 solution?

Solution
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When SO2 is passed through acidified K2Cr2O7 solution. SO2 gas turns acidified potassium dichromate solution from orange to green reduced chromium +4 to +3.
K2Cr2O7+2H2SO4+3SO22Cr2(SO4)3+K2SO4+H2O

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What happens when SO2 is passed through acidified K2Cr2O7 solution?
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