On adding excess of $N{H_3}$ solution to $CuS{O_4}$ solution, the dark blue colour is due to

  • [AIIMS 1982]
  • A

    ${\left[ {Cu{{(N{H_3})}_4}} \right]^{ + 2 }}$

  • B

    ${\left[ {Cu{{(N{H_3})}_2}} \right]^{ + 2 }}$

  • C

    ${\left[ {Cu(N{H_3})} \right]^ + }$

  • D

    None of the above

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