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] (Potassium ferrocyanide) matches with 1, 2, 3.
1. With FeCl₃: Forms Prussian blue ppt., Fe₄[Fe(CN)₆]₃.
2. With CuSO₄: Forms chocolate-brown ppt., Cu₂[Fe(CN)₆].
3. With ZnSO₄: Forms white ppt., Zn₂[Fe(CN)₆].
(Q) K₃[Fe(CN)₆] (Potassium ferricyanide) matches with 2.
2. With CuSO₄: Forms green-brown ppt., Cu₃[Fe(CN)₆]₂.
(R) KCN (Potassium cyanide) matches with 1, 2, 4, 5.
1. With FeCl₃: Forms a reddish-brown solution of hexacyanoferrate(III) complex, not a colored ppt. (Correction needed in original solution).
2. With CuSO₄: Forms a yellow ppt. of CuCN, which dissolves in excess KCN to form .
4. With CdCl₂: Forms white ppt., Cd(CN)₂.
5. With Hg²⁺ and Co²⁺: Forms soluble complexes like and .
(S) KSCN (Potassium thiocyanate) matches with 2, 5.
2. With CuSO₄: Forms black ppt. of Cu(SCN)₂.
5. With Hg²⁺ and Co²⁺: Forms soluble, intensely colored thiocyanate complexes, e.g., and .
Based on these matches, option A is the most appropriate.
