An unknown salt solution (S) reacts as follows: 1. S + dil. HCl → No reaction. 2. S + H₂S/HCl → Black ppt (A). 3. (A) + boiling dil. HNO₃ → Blue solution (B) + Residue (C). 4. (B) + excess NH₃ → Deep

Question

An unknown salt solution (S) reacts as follows:

1. S + dil. HCl → No reaction.

2. S + H₂S/HCl → Black ppt (A).

3. (A) + boiling dil. HNO₃ → Blue solution (B) + Residue (C).

4. (B) + excess NH₃ → Deep blue solution (D).

5.(D) $+ CH_{3} COOH + K_{4} [Fe (CN)_{6}] \to$ Chocolate brown ppt (E).

Which of the following is/are correct?

TestHub · Accepted Answer

Concept: Group IIA analysis, Copper chemistry. Solution: S contains Cu²⁺. A = CuS. B = Cu(NO₃)₂. C = S (oxidation product). D = [Cu(NH₃)₄]²⁺. E = Cu₂[Fe(CN)₆].

Chemistry - Salt Analysis Question with Solution | TestHub

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