A blue colouration is not obtained when

  • [AIPMT 1989]
  • A

    Ammonium hydroxide dissolves in copper sulphate

  • B

    Copper sulphate solution reacts with ${K_4}[Fe{(CN)_6}]$

  • C

    Ferric chloride reacts with sodium ferrocyanide

  • D

    Anhydrous $CuS{O_4}$ is dissolved in water

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  • [AIPMT 1999]