Analytical ChemistryHard
Question
A blue colouration (in solution or precipitate) is not obtained when :
Options
A.ammonium hydroxide dissolves in copper sulphate.
B.cobalt chloride reacts with NH4SCN in presence of amyl alcohol.
C.ferric chloride reacts with sodium ferrocyanide.
D.aqueous ammonia reacts with white precipitate of silver (I) chloride.
Solution
(A), (B) and (C) all gives blue colouration in solution or blue precipitate.
(D) AgCl ↓ + 2NH3 → [Ag(NH3)2]+ Cl- (colourless solution)
(D) AgCl ↓ + 2NH3 → [Ag(NH3)2]+ Cl- (colourless solution)
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