Which of the following involves `sp^(3)`-hybridisation and are tetrahedral ?
A. `Ni(CO)_(4)`
B. `[Cu(NH_(3))_(4)]^(2+)`
C. `[Cu(CN)_(4)]^(3-)`
D. `[Zn(NH_(3))_(4)]^(2+)`

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Correct Answer - A::C::D
`[Ni(CO)_(4)], [Cu(CN)_(4)]^(3-)` and `[Zn(NH_(3))_(4)]^(2+)` involve `sp^(3)`-hybridisation and are tetrahedral.

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