Cu3p+cr2o7-2=cu2+h3po4+CR3
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The reaction Cu3P+Cr2O2−7→Cu2++H3PO4+Cr3+Cu3P+Cr2O72-→Cu2++H3PO4+Cr3+ is a redox reaction where 3 species are undergoing oxidation and reduction. Cu is getting oxidized from +1 state in Cu3P to +2 state : change of 1 e-
P is oxidized from -3 state in Cu3P to +5 state in H3PO4 : change of 8 e-
Cr is getting reduced from +6 state in Cr2O72- to +3 state : change of 3 e-
The balanced chemical equation is
2Cu3P+3 Cr2O72−+26 H+→6Cu2+6Cr3++2PO42−+13H2O2Cu3P+3 Cr2O72-+26 H+→6Cu2+6Cr3++2PO42-+13H2O
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