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Q.

A metal ion give chocolate colored ppt with $K_{4} [Fe (CN)_{6}]$ , What is the oxidation state of that metal in its ion

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answer is 2.

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Detailed Solution

$2 {Cu}^{2 +} + K_{4} [Fe (CN)_{6}] ⟶ \underset{(chocolate brown ppt.)}{C u_{2} [Fe (CN)_{6}] + 4 K^{+}}$

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