Which of the following is non-ionizable?

  • A
    $[Co(NH_3)_3Cl_3]$
  • B
    $[Co(NH_3)_4Cl_2]Cl$
  • C
    $[Co(NH_3)_5Cl]Cl_2$
  • D
    $[Co(NH_3)_6]Cl_3$

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