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In which of the follwing dose the centra...

In which of the follwing dose the central atom exhibit an oxidation state of +4?

A

`K_2[Ni(CN)_4]`

B

`[Cu(NH_3)_4]^(2+)`

C

`[Pt(NH_3)_2Cl_2]`

D

`[Pt(en)_2Cl_2]^(2+)`

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