When hydrogen peroxide is added to acidified solution of dichromate Cr ₂ O ₇²⁻ , a deep blue coloured complex of chromic peroxide CrO ₅ is formed. Oxidation state of Cr in CrO ₅ is

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When H ₂ O ₂ is added to an acidified solution of dichromate Cr ₂ O ₇²⁻ , a deep blue complex chromic peroxide, CrO ₅ is formed. Cr ₂ O ₇²⁻+2 H ⁺+4 H ₂ O ₂ 2 CrO ( O ₂ )₂+5 H ₂ O This deep blue coloured complex has the following structure Let the oxidation state of Cr be x . In CrO ( O ₂ )₂ aligned x+(-1) 4+(-2) & =0 x-6 & =0 x & =+6 aligned