The metallic hydroxide which forms a deep inky blue solution with excess ammonium hydroxide solution is ______.

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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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