Question

What is the color of Fe\(^{3+}\)(aq) ion?

• A. Yellow
• B. Violet
• C. Colourless
• D. Bluepink

Hint:

Transition metal ions with unpaired electrons often show vibrant colors due to d-d transitions.

Answer 1

The Correct Option is A

Iron(III) ions, denoted as Fe\(^{3+}\), typically exhibit a yellow hue in aqueous environments. This coloration arises from d-d transitions involving the 3d electrons. Such colors are common in transition metal complexes, particularly when the metal ion is in a high oxidation state, as is the case with Fe\(^{3+}\). In contrast, iron(II) ions, or Fe\(^{2+}\), usually appear pale green or colorless. Fe\(^{3+}\) ion forms yellow-colored complexes in water.
Therefore, the characteristic color of Fe\(^{3+}\) ions in aqueous solution is yellow.
Final Answer: \[\boxed{\text{The color of Fe}^{3+}\text{(aq) ion is yellow.}}\]