Question: What is the color of the complex ion [Cu(H2O)6]2+?
Options:
Blue
Green
Yellow
Red
Correct Answer: Blue
Solution:
The complex ion [Cu(H2O)6]2+ is blue due to d-d transitions.
What is the color of the complex ion [Cu(H2O)6]2+?
Practice Questions
Q1
What is the color of the complex ion [Cu(H2O)6]2+?
Blue
Green
Yellow
Red
Questions & Step-by-Step Solutions
What is the color of the complex ion [Cu(H2O)6]2+?
Correct Answer: Blue
Step 1: Identify the complex ion, which is [Cu(H2O)6]2+. This means it has a copper (Cu) ion surrounded by six water (H2O) molecules.
Step 2: Understand that copper in this complex is in the +2 oxidation state (Cu2+).
Step 3: Recognize that transition metal complexes can absorb certain wavelengths of light, which causes electrons to move between different energy levels (this is called d-d transitions).
Step 4: Know that when light is absorbed, the complementary color is what we see. For [Cu(H2O)6]2+, it absorbs light in the red/orange region.
Step 5: Since it absorbs red/orange light, the color we see is blue, which is the complementary color.
Coordination Chemistry – Understanding how transition metal ions form complexes with ligands, such as water in this case.
Color of Complex Ions – Knowledge of how the electronic structure of transition metal complexes affects their color due to d-d transitions.
Ligand Field Theory – The theory explaining the splitting of d-orbitals in the presence of ligands and how this relates to the absorption of light.
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