Chemistry - Salt Analysis Question with Solution | TestHub
List - I (Reagents) | List - II (Observations) |
|---|---|
(P) | (1) Produces colored ppt. with |
(Q) | (2) Produces colored ppt. with |
(R) KCN | (3) Produces ppt. with aqueous |
(S) KSCN | (4) Can produce ppt. with aqueous |
| (5) Can form soluble compound with |
Options:
Answer:
Solution:
(P) K₄[Fe(CN)₆] matches with 1, 2, 3: It forms a Prussian blue precipitate with FeCl₃, a chocolate-brown precipitate with CuSO₄, and a white precipitate with ZnSO₄.
(Q) K₃[Fe(CN)₆] matches with 2: It reacts with CuSO₄ to form a characteristic green-brown precipitate of copper(II) ferricyanide.
(R) KCN matches with 1, 2, 4, 5: It precipitates Fe³⁺ as a cyanide complex, forms copper cyanide complexes, precipitates Cd(CN)₂ with CdCl₂, and forms soluble complexes like and .
(S) KSCN matches with 2, 5: It produces a black precipitate of Cu(SCN)₂ with CuSO₄ and forms highly soluble, intensely colored thiocyanate complexes with Hg²⁺ and Co²⁺.
