1.

The dark blue colour of the solution formed when excess of ammonia is added to a solution of copper (II) sulphate is due to the presence of the ion

Answer»

`[Cu(OH)_(4)(H_(2)O)_(2)]^(2-)`
`[Cu(H_(2)O)_(6)]^(2+)`
`[Cu(NH_(3))_(2)(H_(2)O)_(4)]^(2+)`
`[Cu(NH_(3))_(4)(H_(2)O)_(2)]^(2+)`

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