Chemistry
The metallic hydroxide which forms a deep inky blue solution with excess ammonium hydroxide solution is:
- Fe(OH)2
- Cu(OH)2
- Ca(OH)2
- Fe(OH)3
Analytical Chemistry
ICSE 2023
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Answer
Cu(OH)2
Reason — Cu(OH)2 reacts with a solution of excess ammonium hydroxide to form a deep blue solution of tetrammine copper [II] sulphate.
Cu(OH)2 + (NH4)2SO4 + 2NH4OH ⟶ [Cu(NH3)4]SO4 + 4H2O
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