In the complex $[Co(NH_3)_6]^{3+}$,which species act as a Lewis acid and a Lewis base,respectively?

  • A
    $Co^{2+}, NH_3$
  • B
    $NH_3, Co$
  • C
    $Co^{3+}, NH_3$
  • D
    $NH_3, Co^{3+}$

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