So2 is passed through acidified k2cr2o7 solution
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this is the complete equation...
SO2 + K2Cr2O7 + H2SO4 = K2SO4 + Cr2(SO4)3 + H2O
SO2 + K2Cr2O7 + H2SO4 = K2SO4 + Cr2(SO4)3 + H2O
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