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When Ethane-1,2-diamine is added progressively to an aqueous solution of Nickel (II) chloride, the sequence of colour change observed will be :

Options

  1. AViolet Blue Pale Blue Green
  2. BPale Blue Blue Green Violet
  3. CGreen Pale Blue Blue Violet
  4. DPale Blue Blue Violet Green

Correct answer

C. Green Pale Blue Blue Violet

Step-by-step solution

[ Ni ( H ₂ O )₆ ]_ ( aq ) ⁺²+ en _ ( aq ) [ Ni ( H ₂ O )₄( en ) ]_ ( aq ) ⁺²+2 H ₂ O Green [ Ni ( H ₂ O )₄( en ) ]_ ( aq ) ⁺²+ en _ ( aq ) [ Ni ( H ₂ O )₂( en )₂ ]_ ( aq ) ⁺²+2 H ₂ O Pale Blue [ Ni ( H ₂ O )₂( en ) ]_ ( aq ) ⁺²+ en _ ( aq ) [ Ni ( en )₃ ]_ ( aq ) ⁺²+2 H ₂ O Blue / purple

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