K2Cr2O7 + C2O4^2– + H2SO4 → K2SO4 + CO2 + Cr2(SO4)3 + H2O. In above reaction, identify the elements which do not undergo change in their oxidation state —

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K2Cr2O7 + C2O4^2– + H2SO4 → K2SO4 + CO2 + Cr2(SO4)3 + H2O. In above reaction, identify the elements which do not undergo change in their oxidation state —

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