Which complex is formed when an aqueous solution of $NH_3$ is added to a $CuSO_4$ solution,resulting in a deep blue color?

  • A
    $[Cu(NH_3)_4]^{2+}$
  • B
    $[Cu(NH_3)_2]^{2+}$
  • C
    $[Cu(NH_3)]^+$
  • D
    None of the above

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