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Question

The metal hydroxide which is soluble in excess of ammonium hydroxide:

A
Fe(OH)2
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B
Fe(OH)3
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C
Cu(OH)2
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D
Al(OH)3
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Solution

The correct option is C Cu(OH)2
The metal hydroxide which is soluble in excess of ammonium hydroxide is Cu(OH)2. It forms soluble complex tetramminecupric hydroxide [Cu(NH3)4](OH)2.
Cu(OH)2+4NH4OH[Cu(NH3)4](OH)2+4H2O

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