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# A complex in which central atom carries zero oxidation state is

$\begin{array}{1 1}(a)\;[CO(NH_3)_3Cl_3&(b)\;PtCl_4.2NH_3\\(c)\;Ni(CO)_4&(d)\;Na_2[Ni(CN)_4]\end{array}$

A complex in which central atom carries zero oxidation state is $Ni(CO)_4$
Hence (c) is the correct answer.