1.

In which of the following pairs of complexes the central metal/ions do have same effective atomic number?

Answer»

`[CR(CO)_(6)]" and "[FE(CO)_(5)]`
`[Co(NH_(3))_(6)]^(2+)" and "[Ni(NH_(3))_(6)]^(2+)`
`[Cu(CN_(4))]^(3-)" and "[Ni(CO)_(4)]`
`[V(CO)_(6)]^(-)" and "[Co(NO_(2))_(6)]^(3-)`

Answer :A::C::D


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