Chemistry - Salt Analysis Question with Solution | TestHub

ChemistrySalt AnalysisTEST OF CATIONS Dry Test, Group Analysis, Group 1,2Medium2 minQB

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Which of the following cation gives chocolate brown ppt with $K_{4} [Fe (CN)_{6}]$

Options:

Answer:

Solution:

Copper(II) ions ( $C u^{2 +}$ ) react with potassium ferrocyanide ( $K_{4} [F e (CN)_{6}]$ ) to form a chocolate brown precipitate of copper(II) ferrocyanide ( $C u_{2} [F e (CN)_{6}]$ ). This reaction is a characteristic test for $C u^{2 +}$ ions.

The reaction is:

$2 C u^{2 +} (a q) + K_{4} [F e (CN)_{6}] (a q) \to C u_{2} [F e (CN)_{6}] (s) + 4 K^{+} (a q)$

Stream:JEESubject:ChemistryTopic:Salt AnalysisSubtopic:TEST OF CATIONS Dry Test, Group Analysis, Group 1,2

⏱ 2mℹ️ Source: QB

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