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

Fe\(^{3+}\) (iron(III)) ions typically impart a yellow color in aqueous solutions due to the d-d transition of the 3d electrons. This color is characteristic of many transition metal complexes where the metal ion has a high oxidation state, like Fe\(^{3+}\).
- Fe\(^{2+}\) (iron(II)) ions, on the other hand, are typically pale green or colorless.
- Fe\(^{3+}\) ion forms yellow-colored complexes in water.
Thus, the color of Fe\(^{3+}\) is yellow.
Final Answer: \[ \boxed{\text{The color of Fe}^{3+}\text{(aq) ion is yellow.}} \]