Which one of the following compounds is not coloured

  • [AIIMS 1997]
  • A

    $N{a_2}CuC{l_4}$

  • B

    $N{a_2}CdC{l_4}$

  • C

    ${K_4}Fe{(CN)_6}$

  • D

    ${K_3}Fe{(CN)_6}$

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