The homoleptic complex in the following is

  • A
    $[Co(NH_3)_4 Br_2]^{\oplus}$
  • B
    $[Co(C_2O_4)(NH_3)_4]^{\oplus}$
  • C
    $[Co(NH_3)_6]^{3\oplus}$
  • D
    $[Co(CN)_4 Cl_2]^{\ominus}$

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What is the number of covalent bonds in the $[Co(NH_3)_6]Cl_3$ complex?

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