Question

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

• A. Green \(\rightarrow\) Pale Blue \(\rightarrow\) Blue \(\rightarrow\) Violet
• B. Pale Blue \(\rightarrow\) Blue \(\rightarrow\) Green \(\rightarrow\) Violet
• C. Pale Blue \(\rightarrow\) Blue \(\rightarrow\) Violet \(\rightarrow\) Green
• D. Violet \(\rightarrow\) Blue \(\rightarrow\) Pale Blue \(\rightarrow\) Green

Hint:

The color changes in coordination compounds depend on the nature of ligands and the metal ion.

Answer 1

The Correct Option is C

- Upon the addition of ethane-1,2-diamine to the solution, the nickel (II) complex experiences altered coordination, leading to sequential color changes. The solution transitions from pale blue to blue, then to violet, and ultimately to green. Final Answer: Option (3).