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Question
The metallic hydroxide which forms a deep inky blue solution with excess ammonium hydroxide solution is ______.
Options
Fe(OH)2
Cu(OH)2
Ca(OH)2
Fe(OH)3
Solution
The metallic hydroxide which forms a deep inky blue solution with excess ammonium hydroxide solution is Cu(OH)2.
Explanation:
The pale blue Cu(OH)2 precipitate dissolves in excess of ammonium hydroxide derived from tetraamine copper sulphate.
\[\ce{Cu(OH)2 + (NH4)2SO4 + 2NH4OH -> [Cu(NH3)4]SO4 + 4H2O}\]
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