In which of the following complexes is the oxidation state of the metal zero?

  • A
    $[Pt(NH_3)_2Cl_2]$
  • B
    $[Cr(CO)_6]$
  • C
    $[Cr(NH_3)_3Cl_3]$
  • D
    $[Cr(en)_2Cl_2]$

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