What is the color of the complex ion [Cu(NH3)4]2+? (2021)

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Question: What is the color of the complex ion [Cu(NH3)4]2+? (2021)

Options:

Correct Answer: Blue

Exam Year: 2021

Solution:

[Cu(NH3)4]2+ is known to exhibit a blue color due to d-d transitions.

What is the color of the complex ion [Cu(NH3)4]2+? (2021)

What is the color of the complex ion [Cu(NH3)4]2+? (2021)

Step 1: Identify the complex ion, which is [Cu(NH3)4]2+. This means it has a copper (Cu) ion surrounded by four ammonia (NH3) molecules.
Step 2: Understand that copper ions can have different colors depending on their oxidation state and the ligands attached to them.
Step 3: Recognize that ammonia (NH3) is a ligand that can influence the color of the complex ion.
Step 4: Learn that the color of transition metal complexes, like [Cu(NH3)4]2+, is often due to electronic transitions within the d-orbitals of the metal ion.
Step 5: Note that for [Cu(NH3)4]2+, the d-d transitions result in the absorption of certain wavelengths of light, which leads to the complex appearing blue.

Coordination Chemistry – The study of complex ions formed by transition metals and ligands, including their colors and properties.
d-d Transitions – The electronic transitions between d-orbitals in transition metal complexes that result in color.