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Color Of Complexes

Easychemistry

Color in transition metal complexes mainly arises due to:

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About This Question

Subject
chemistry
Chapter
coordination compounds
Topic
color of complexes
Difficulty
Easy
Year
2025
Tags
colorelectronic transitions

Solution

Correct Answer:

d–d transitions within split d-orbitals

  1. Orbital Splitting: CFT explains that -orbitals of a metal are split into two sets (e.g., and ) by the ligand field.
  2. Radiation Absorption: When white light falls on the complex, an electron from a lower energy -orbital can absorb a specific wavelength (energy) and jump to a higher energy -orbital.
  3. Observed Color: The transmitted light (what we see) consists of the remaining wavelengths, which is the complementary color of the absorbed radiation.
  4. Requirement: This necessitates partially filled -orbitals. (zinc) and (scandium III) complexes are generally colorless.

This easy difficulty chemistry question is from the chapter coordination compounds, covering the topic of color of complexes. It appeared in the 2025 exam.

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