Write balanced chemical equations for the conversion of CrO2-4 to Cr2O2-7 in acidic medium and Cr2O2-7 to CrO2-4 in basic medium-

In acidic medium, yellow chromate ion is converted into orange red dichromate ion. #160; #160; #160; Yellow2CrO_4^2 #160; + 2H^+ → #160; #16 ...

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Oxidation Number Method

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Question

Write balanced chemical equations for the conversion of $C r O_{4}^{2 -}$ to $C r_{2} O_{7}^{2 -}$ in acidic medium and $C r_{2} O_{7}^{2 -}$ to $C r O_{4}^{2 -}$ in basic medium.

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C r_{2} O_{7}^{2 -} (a q) + S O_{3}^{2 -} (a q) \to C r^{3 +} (a q) + S O_{4}^{2 -} (a q)

H_{2} S O_{3} + C r_{2} O_{7}^{2 -} \to H_{2} S O_{4} + C r^{3 +} + H_{2} O

C_{2} H_{5} O H + C r_{2} O_{7}^{2 -} \to C H_{3} C O O H + C r^{3 +}

C_{2} H_{5} O H

C r_{2} O_{7}^{2 -}

C l O^{-} + C r O_{2}^{-} \to C l^{-} + C r O_{4}^{2 -}

C u_{3} P + C r_{2} O_{7}^{2 -} \to C u^{2 +} + H_{3} P O_{4} + C r^{3 +}

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